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1 © 2020 Enphase Energy Inc . All rights reserved. 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Planning an Ensemble Technology System North America 2 © 20 20 Enphase Energy Inc. All rights reserved. December 8 , 2020 This document provides site surveyors and design engineers with the information required to evaluate a site and plan document supplement s the in formation in the data sheets, quick install guides , and product manuals. Diagrams and information in this document are illustrative of example system configurations and installations. However, they may not include all requirements from additional local cod es and standards and Authorities Having Jurisdiction (AHJs) applicable to a site. With Ensemble technology , homeowners have power when the grid goes down and can save money when the grid is up. Ensemble technology systems include the following Enphase products: Enphase Encharge sto rage system is an all -in -one AC coupled storage system that includes embedded , grid -forming multimode microinverters. You can connect multiple Encharge storage systems to maximize potential backup for homes. The Encharge 3 storage system provides flexibility to customers to start small and add capacity incrementally. Enphase Enpower connects the home to grid power, the Encharge storage system , and PV. It provides microgrid interconnect device (MID) functionality by automatically detecting and seamlessly transitioning the system from grid power to backup power in the eve nt of a grid failure. It allows Encharge storage systems to form an intentional island (per IEEE 1547.4 definition) and contains a neutral -forming transformer (NFT) to enable 120/240 V operation in backup mode . Enphase Wireless communication kit enables di rect communication between Encharge, Enpower, and the Envoy using 2.4 GHz fre q uency. The kit is connected to one of the USB ports on the Envoy. An Enphase Mobile Connect cellular modem is required unless already present to ensure the best performance of your system. The cellular modem connects to a USB port on the Envoy. For new or retrofit systems with IQ -Series solar microinverters: o IQ 6 / IQ 7 series microinverters and accessories. Ensemble technology is fully compatible with IQ 7 and IQ 6 series microinverters and makes retrofit upgrades as simple as new installations. o IQ Envoy , a communications gateway that can communicate with M -Series inverters, Encharge batteries , and the Enpower smart switch . It collect s system performance information and transmit s that information over the i nternet to . A n IQ Envoy is required for Ensemble systems with IQ -Series microinverters. Note the IQ Envoy is included in an Enphase IQ Combiner . For retrofit sites , an IQ Envoy may already be present . o C ombiner series consolidates interconnection equipment into a single enclosure and streamlines PV and storage installations by providing a consistent, pre -wired solution for residential applications. It includes the En phase IQ Envoy . Install the new communication kit in any IQ C ombiner to enable wireless communication with Encharge and Enpower. For retrofit systems with M -Series solar microinverters: o Enphase M -Series microinverters and accessories. Ensemble technology is compatible with Enphase M215 and M250 microinverters and makes retrofit upgrades simple. Note: The Ensemble upgrade is only compatible with M215 and M250 series microinverters. Other legacy microinverters are not supported. o An Envoy -S Metered is required. It is a communications gateway that can communicate with M - Series inverters, Encharge batteries and the Enpower smart switch. It collects system performance information and transmit s An Envoy - S Metered is required for every Ens emble system with M -Series microinverters. Note: Legacy Envoy/EMU SKUs (ENV -120 -01 or ENV -1 20 -02, IEMU -03 or IEMU -01 or IEMU02) will not work with an Ensemble system. You must replace these legacy SKUs with an Envoy -S Metered during the Ensemble installation . Note : This guide describes an Ensemble system with IQ -Series or M -Series microinverters. Please pay particular attention to the equipment requirement for each type of microinverter. Planning an Ensemble Technology System North America 3 © 20 20 Enphase Energy Inc. All rights reserved. December 8 , 2020 Note: The IQ Envoy will not communicate with M -Series microinverters and M -Series microinverters will not communicate with the IQ En voy. Enphase Consumption CTs enable home energy consumption monitoring and are required for Ensemble to operate correctly. Regulatory Background National Electrical Code Grid -tied only PV inverters are required to shut down in the event of a utility grid power outage. They cannot form an un -intentional island , and their anti -islanding technology prevents the formation un intentional islands. Ensemble technology systems could provide backup t o some or all of the load circuits in a home by forming an intentional island according to 2017 NEC sections 690 and 705. The Enpower smart switch with MID function in conjunction with the multimode inverters in the Encharge energy storage system comprise a microgrid system that forms an intentional island entirely within the bounds of the local electric power system (EPS). Figure 1 below shows a drawing of an AC coupled multimode system based on 2017 NEC section 690 and 705. Figure 1 : Microgrid system components based on 2017 NEC 690 and 705 Ensemble technology system flexibility enables many backup configurations for different customer goals and needs. There are two common configurations that allow the En charge storage system to provide power to customer loads independent of the grid. Whole -home Backup Enpower I nstalled on the L ine -S ide of the M ain L oad P anel In the whole home (main load panel) backup configuration, Enpower smart switch is installed on the line -side of the main load panels rated up to 200A. This allows a properly sized Ensemble technology system to provide power to all loads in the main load panel in the event of a grid outage. In this configuration, the Enpower smart switch can be confi gured with a main breaker to act as the service disconnecting means. The PV system can be interconnected to the Enpower smart switch on a dedicated breaker or may be interconnected to the main load panel. This configuration typically supports larger PV and storage system sizes and may allow avoiding expensive utility service and/or main service panel upgrades. E xample s of this whole -home (main load panel) backup configuration are shown in Figure 2 for IQ -Series microinverters based systems and Figure 3 for M -Series microinverters based systems . Planning an Ensemble Technology System North America 4 © 20 20 Enphase Energy Inc. All rights reserved. December 8 , 2020 Figure 2 : Always -On Ensemble technology system with whole -home (main load panel) backup for IQ -Series PV microinverters . The Enpower smart switch is installed on the line -side of the main load panel, and PV and Encharge storage system are interconnected into the Enpower smart switch. Figure 3 : Always -On Ensemble technology system with whole -home (main load panel) backup for M -Series PV microinverters . The Enpower smart switch is installed on the line -side of the main load panel, and PV and Encharge storage system are interconnected into the Enpower smart switch. Planning an Ensemble Technology System North America 5 © 20 20 Enphase Energy Inc. All rights reserved. December 8 , 2020 Partial Home (S ubpanel) Backup Enpower Smart Switch a nd a Backup Subpanel Installed o n the Load Side o f t he Main Load Panel The Enpower smart switch can also be installed on the load side of the exiting main load panel or service equipment. This configuration can be us ed when the Ensemble technology system is configured to provide backup to a number of pre -selected load circuits. This configuration is recommended when Encharge storage systems with smaller energy and power capacity and some basic load backup is desired b y the customer, or when existing constraints prevent main panel backup or other installation methods. Figure 4 below shows an example of a partial home (subpanel) backup configuration for an IQ -Series microinverters based system while Figure 5 shows the same for M -Series microinverter based sy stem . Figure 4 : Always -On Ensemble technology system with partial home (subpanel) backup for IQ -Series microinverters . Enpower is installed on the load si de of the main load panel with select loads backed up in a backup subpanel. Figure 5 : Always -On Ensemble technology system with partial home (subpanel) backup for M -Series microinverters . Enpower is installed on the load side of the main load panel with select loads backed up in a backup subpanel. Planning an Ensemble Technology System North America 6 © 20 20 Enphase Energy Inc. All rights reserved. December 8 , 2020 Split Enphase S ystems on a S ingle S ite I f the total PV system size exceeds what can be supported by the total Encharge system size the PV systems into a microgrid, and a non -microgrid PV system , each with their own Envoy. For guidance PV system size pairing with an En charge system , s ee the section s : IQ Microinverter PV System to Encharge Pairing and M -Series Microinverter PV System to Encharge Pairing This configuration does not supp ort power export limiting. The following items are needed to create a split system . 1. Two Envoys: Multiple Envoys are required for split systems, because the microgrid and non -microgrid PV microinverters operate with different grid profiles and parameters. 2. I nstallation of a power line filter: When multiple Envoys exist on site, a power line filter must be installed to prevent cross domain communication. The Q -LCF -064 -1P is a tested solution that is compatible with Enphase IQ 6/7 microinverters and IQ Envoy at up to 64A of continuous current. Similarly , the RP220 , RP225 , RP230 , or RP240 series from Radius Power can be used with M215/M250 microinverters and the Envoy -S M etered . Enphase recommends installing the power line filter with the microgrid Envoy and all microgrid PV (See figures below.) 3. Installation of addit ional Consumption CTs: Depending on the configuration of the split system, an additional pair of Consumption CTs may need to be added. See the following for details. Split systems that DO require additional Consumption CTs If the non -microgrid PV system i s interconnected on the load side of the primary microgrid Envoy Consumption CT, a second set of Consumption CTs must be added around the non -microgrid PV conductors and connected in parallel with the primary microgrid Consumption CT wiring to the microg rid Envoy. Please refer to Figure 6 and Figure 7 for more details and the orientation of the CTs. Figure 6 : S Planning an Ensemble Technology System North America 7 © 20 20 Enphase Energy Inc. All rights reserved. December 8 , 2020 Split systems that do NOT require addit ional Consumption CTs For systems where the non -microgrid PV system is interconnected on the utility side of the primary microgrid Envoy Co nsumption CTs, NO additional Consumption CTs are needed. See Figure 7 for this configuration. Figure 7 : S that does NOT require an additional set of Consumption CTs M -Series microinverter systems support similar . An example where non -microgrid PV system is interconnected on the utility side of the microgrid Envoy Consu mption CTs is shown below. No additional consumption CTs are needed . Figure 8 : M -Series Planning an Ensemble Technology System North America 8 © 20 20 Enphase Energy Inc. All rights reserved. December 8 , 2020 The Encharge storage system can be added to an existing system without using an Enpower smart switch, however, it will not provide backup power . When installed in this configuration, the Encharge storage system is treated as a distributed energy re source (DER), equivalent to a PV system , and cannot form an intentional island. It may be connected in the IQ C ombiner or on a user -provided distribution point in compliance with the NEC. Ensure that the consumption CTs are installed on the line -side of En charge storage system interconnection point and that Encharge storage system circuits are not included in the production CT. Figure 9 and Figure 10 show this configuration for IQ6/7 and M215/250 microinverters, respectively. Figure 9 : Grid interactive Encharge storage system installation with no backup on IQ6/7 m icroinverter s ite s Figure 10 : Grid interactive Encharge storage system installation with no backup on M -Series microinverter sites Planning an Ensemble Technology System North America 9 © 20 20 Enphase Energy Inc. All rights reserved. December 8 , 2020 The first step in correctly sizing a system is a proper load analysis. If an Envoy with correctly configured consumption CTs is already installed at a site, you can use data from Enlighten to properly size the system. A site survey, electric bills, and thi rd -party consumption meters can also provide useful load data for system sizing. A lso , review the Enphase Ensemble Project Survey document and System Estimator at estimator.enphaseenergy.com . A backup system provides power to loads when the grid is down. It is important to differentiate the terms power and energy . Power is a measure of the instantaneous electricity used and is expressed in units of watts (W) or kilowatts (kW). Energy is the accumulated or integrated power used over time and is expressed in units of watt -hours (Wh) or kilowatt -hours (kWh). When running in the backup operation, any power capacity shortages or energy capacity shortages will result in a loss of power to loads and should be avoided. Therefore, it is important to properly size the system for both power and energy capacities in each installation. Sufficiently size the total Encharge storage system power rating to power loads and charge from PV power generation. You can increase the power rating by adding additional Encharge storage units, which also provide additional energy, improving the customer user experience. Power (kW) capacity from Encharge storage system must exceed the maximum single load . T otal IQ 6 or IQ 7 series microinverters AC power rating connected to the microgrid may not exceed 150% of the total Encharge continuous power rating (Table 1). o 2017 NEC 690.10 -> 710.15 (A) Supply Output. Power supply to premises wiring systems shall be permitted to have less capacity than the calculated load. The capacity of the stand -alone supply shall be equal to or greater than the load posed by the largest single utilization equipment connected to the system. Calculated general lighting loads shall not be considered as a single load. Energy storage (kWh) capacity should be sized to supply to the estimated backup loads for a user -defined period. Sizing Encharge Storage System for Whole -home (Main Pane l) Backup For whole -home backup , when an Enpower smart switch is installed on the lin e -side of the main load panel, at minimum, the greater of a) two Encharge 10 units or b) number of Encharge 3 units to mee t the IQ Microinverter PV System to Encharge Pairing (see below), is recommended. Sizing Encharge Storage System for Partial Home (Sub panel) Backup For partial home backup , when an Enpower smart switch is installed on the load side of the main load panel follow these steps to size an Encharge storage system: 1. Identify the largest maximum single load power rating (kW) that you want to back up , and select the absolute minimum number of Encharge units required to meet the 2017 NEC 690.10 ->710.15(A) requirements. 2. Calculate the total PV system maximum continuous output power of all IQ 6 / IQ 7 series microinverters in the system. Then select the minimum number of Encharge storage units required so that the total PV system output AC power is no t greater than 150% of the total Encharge storage system power capacit y . 3. Based on the estimated backup loads for the user -defined period, calculate the requ ired Encharge energy storage (kWh) capacity and the minimum number of Encharge required. 4. number of Encharge units required for the storage system. a. The minimum number of Encharge 3 units required is the largest of the calculated values in steps 1 and 2. b. The desired number of Encharge storage system units is the value calculated in step 3. c. The maximum allowed number of Encharge 3 units that can be connecte d to a single Enpower smart switch is 12 (four Encharge 10). Planning an Ensemble Technology System North America 10 © 20 20 Enphase Energy Inc. All rights reserved. December 8 , 2020 The following table identifies the maximum number of microinverters that can be connected to a given Encharge storage system size . Maximum PV system output power cannot be greater than 150% of the total Encharge storage system power capacity to ensure stable system operation. Table 1 : Maximum number of IQ microinverters for Encharge storage system for backup operation Encharge 3 units Equivalent Encharge 10 units Encharge energy capacity (kWh) Encharge power capacity (kWac) Max PV system power (kWac) Maximum number of microinverters IQ 6 IQ 6+ IQ 7 IQ 7+ IQ 7X IQ 7A 1 3.36 1.28 1.92 8 6 8 6 6 5 2 6.72 2.56 3.84 16 13 16 13 12 11 3 (1x Encharge 10) 10.08 3.84 5.76 25 20 24 19 18 16 4 13.44 5.12 7.68 33 27 32 26 24 22 5 16.8 6.4 9.6 41 34 40 33 30 27 6 (2 x Encharge 10) 20.16 7.68 11.52 50 41 48 39 36 33 7 23.52 8.96 13.44 58 48 56 46 42 38 8 26.88 10.24 15.36 66 54 64 52 48 44 9 (3 x Encharge 10) 30.24 11.52 17.28 75 61 72 59 54 49 10 33.6 12.8 19.2 83 68 80 66 60 54 11 36.96 14.08 21.12 91 75 88 72 67 60 12 (4 x Encharge 10) 40.32 15.36 23.04 100 82 96 79 73 66 Warning: Undersizing power and energy capacity of the storage system may lead to a poor user experience. User education and setting reasonable expectations of system performance is essential with systems involving backup storage. The following table identifies the maximum number of microinverters that can be connected to a given Encharge storage system size. Table 2 : Maximum number of M -Series microinverters for Encharge storage system for backup operation Encharge 3 units Equivalent Encharge 10 units Encharge energy capacity (kWh) Encharge continuous power (kWAC) Max PV system power (kWAC) # of microinverters M215 M250 1 3.26 1.28 1.92 8 8 2 6.52 2.56 3.84 17 16 3 (1x Encharge 10) 9.78 3.84 5.76 26 24 4 13.04 5.12 7.68 35 32 5 16.30 6.40 9.60 44 40 6 (2 x Encharge 10) 19.56 7.68 11.52 53 48 7 22.81 8.96 13.44 62 56 8 26.07 10.24 15.36 71 64 9 (3 x Encharge 10) 29.33 11.52 17.28 80 72 10 32.59 12.80 19.20 89 80 11 35.85 14.08 21.12 98 88 12 (4 x Encharge 10) 39.11 15.36 23.04 107 96 Warning: Under sizing power and energy capacity of the storage system may lead to a poor user experience. User education and setting reasonable expectations of system performance are essential with systems involving backup storage. Planning an Ensemble Technology System North America 11 © 20 20 Enphase Energy Inc. All rights reserved. December 8 , 2020 In Sel f Consumption generation is stored in the Encharge storage system for use later in the day when there is not sufficient power fr o m Solar PV to supply the home loads. Homeowners benefit by consuming the onsite -generated en ergy themselves instead of exporting it to the grid during the day and purchasing power from the grid during evening and night times. In customer self -consumption scenarios, size the Encharge storage capacity to accommodate the expected daily energy expor t. This is roughly less than two -thirds of the average daily energy load of the home. There are many economic goals that the Encharge storage system supports. These include reducing the utility bill by charging during low tariff periods and saving charge to ensure that loads can be served through the battery(ies) during the peak tariff period . Power from PV can be exported to the grid especially during peak tariff periods. The system also supports the special case of power export limiting, where the utility does not allow a homeowner to export power from the PV system to the grid. Examples are the Hawaii self -supply and NEM+ programs where no export is allowed, which is called zero export . Optimizing energy storage cap acity sizing for economic use cases is beyond the scope of this document. You can use s imulation tools like NREL SAM (System Advisor Model) or Energy Toolbase to assist with sizing in these use cases. The Encharge storage system supports 3 smart profiles for the batteries to implement the backup, self -consumption and economic use cases described above. These are: 1. Full Backup 100% of the battery capacity is reserved for backup and the battery does not discharge while on - grid . 2. Se lf -Consumption The battery discharges until reserved capacity to ensure the home loads are served with PV and storage as far as possible . Effectively the system tries to reduce import from the grid whenever possible. Note the battery only discharge s unti l the re serve charge limit while on -grid. The battery discharges b elow the reserve charge limit only when the grid is down. 3. Savings This profile i s for the economic use case wherein the battery discharges when the rates are at the peak and charge s using PV prior to peak tariff periods. Note that the Encharge storage does not export to the grid. D uring peak tariff period PV is exported to the grid and battery is discharg e d to serve loads . Note the battery only discharge s until the reserve charge lim it while on -grid. The battery discharges below the reserve charge limit only when the grid is down. Description of these modes with screenshots of how homeowners can select the same is available in the Enphase Storage system . Note in all modes the battery will charge from the grid until the reserve charge limit to ensure that the desired amount of battery charge for backup is guaranteed to be available. Planning an Ensemble Technology System North America 12 © 20 20 Enphase Energy Inc. All rights reserved. December 8 , 2020 The Enphase Enpower smart switch consolidates interconnection equipment into a single enclosure and streamlines grid -independent capabilities of PV and storage d istributed e nergy r esources (DER) installations by providing a consistent, prewired solution for residential applications . Enpower is a s ervice e ntrance rated m icrogrid i nterconnect d ev ice that includes a neutral -forming transformer for single -phase backup operation and a n Eaton BR bus bar assembly. Centered mounting brackets support single stud mounting Supports conduit entry from the lower sides, back, or bottom Up to 200A rating Includes neutral -forming transformer for single -phase backup operation Includes lugs and circuits for interconnection of line -side power, PV combiner, Encharge storage system, backup load panel, and generator (to be activated in future) Mechanical Data Enpower Dimensions (W x H xD): 19.7 in x 36 in x 9.7 in (50 cm x 91.6 cm x 24.6 cm) Weight : 3 8 .5 kg (85 lbs) Ambient temperature range : -40 º C to +50 º C (-40 º to 122 º F) Model Number Description Shipment Contents EP200G101 - M240US00 Enphase Enpower s mart s witch with 200A capacity, neutral - forming transformer providing m icrogrid i nterconnect d evice (MID) functionality. One b ox of one u nit Main and Load Breakers For wire sizes accepted by each terminal, see the Enpower smart switch data sheet. Enpower supports optional circuit breakers on both the input (line -side ) and output (load side) of the MID relay. Enpower can be configured with the following main circuit breakers to support different field requirements in compliance with NEC 705.12. Pay special attention to conductor ampacity rating when selecting the main breakers for the line -side and load side. Breakers are not included in the Enpower smart switch and must be ordered separately. Model Number Description Shipment Contents BRK -200A -2P -240V Main b reaker, 2 -pole, 200A, 25kAIC, CSR2200N for Enpower One b ox of one u nit BRK -175A -2P -240V Main b reaker, 2 -pole, 175A, 25kAIC, CSR2175N for Enpower One box of one unit BRK -150A -2P -240V Main b reaker, 2 -pole, 150A, 25kAIC, CSR2150N for Enpower One box of one unit BRK -125A -2P -240V Main b reaker, 2 -pole, 125A, 25kAIC, CSR2125N for Enpower One box of one unit BRK -100A -2P -240V Main b reaker, 2 -pole, 100A, 25kAIC, CSR2100N for Enpower One box of one unit Main Breaker and Load Breaker Installed in the Enpower Smart Switch When installed on a new or existing electrical service as the service equipment disconnecting means and over current protection device, Enpower smart switch typically needs a circuit breaker installed for a main breaker and another breaker for the load breaker. The main and load breakers should be of equivalent rating of the service for whole -home (main panel) backup configurations. For example, a 200 A service would typically have two 200 A rated Eaton CSR 2200N (BRK -200A -2P -240V) installed. When Enpower is used as the service disconnect with a main bonding jumper installed, all equipment grounding conductors and neutrals on downstream feeders and panel boards must be separated. Planning an Ensemble Technology System North America 13 © 20 20 Enphase Energy Inc. All rights reserved. December 8 , 2020 Load Breaker Installed in th e Enpower Smart Switch If there is an existing service equipment such as an existing fusible disconnect on the line -side of Enpower, a main breaker may not be required on the line -side input of Enpower smart switch. However, a load breaker may still be req uired. Size the load breaker with the same rating as the system over current protection device for the whole -home (main panel) backup configuration. For example, if there is an existing 200 A meter disconnect combo feeding a main lug panel board, Enpower s mart switch would be installed with a 200 A rated Eaton CSR2200N (Enphase SKU: BRK - 200A -2P -240V) as a load breaker inside Enpower smart switch. Main Breaker Installed in the Enpower Smart Switch For the whole -home (main panel) backup configuration, if the service rating is less than 200 A, a load breaker may not be required. For example, a 100 A service has DER over current protection totaling less than 100A. In this case, Enpower smart switch would be installed wi th a 100 A rated Eaton CSR2100N (BRK -100A -2P -240V) as a main breaker on the line -side of the main load panel. Ensure that the sum of load and DER breakers does not exceed 200 A rating of the busbar and Enpower smart switch load conductors are rated appropr iately. Enpower Smart Switch Without Main or Load Breakers Installed When Enpower smart switch is installed on the load side of the service equipment disconnect means, main and load breakers may not need to be installed in the Enpower. For example, an En power smart switch is installed with total of 40 A of DER over current protection and that is back feeding a 200 A main breaker load center. In this case, it necessary to install main or load breakers in the Enpower smart switch. Ensure that the sum of the load and DER over current protection is less than 200 A and that conductors are sized to comply with 2017 NEC 705.12(B)(2)(1). Encharge Storage System , IQ C ombiner or Generator (f uture ) Breakers When connecting the Encharge storage system, IQ C ombiner , or generator to the Enpower smart switch, use one of the following circuit breakers depending on system requirements. Model Number Description Shipment Contents BRK -80A -2P -240V Circuit b reaker, 2 -pole, 80A, 10kAIC, BR280 for Enpower One box of one unit BRK -60A -2P -240V Circuit b reaker, 2 -pole, 60A, 10kAIC, BR260 for Enpower One box of one unit BRK -40A -2P -240V Circuit b reaker, 2 -pole, 40A, 10kAIC, BR240 B for Enpower One box of one unit BRK -30A -2P -240V Circuit b reaker, 2 -pole, 30A, 10kAIC, BR230 B for Enpower One box of one unit BRK -20A -2P -240V -B Circuit b reaker, 2 -pole, 20A, 10kAIC, BR220 B for Enpower One box of one unit Encharge and generator breakers may require a BRHDK125 hold down kit in accordance with 408.36(D) as referenced in NEC 710.15(E). This hold down is not required for the IQ C ombiner circuits with IQ 6 / IQ 7 series microinverters since these inverters are s till interactive inverters and are permitted to omit the additional fastener 2017 NEC 705.12(B)(5). This aligns with the AC coupled multimode system diagram, Figure 1, in 2017 NEC 690.1(b), which shows both an interactive and multimode inverter. Encharge s torage system includes the multimode inverters forming an intentional local EPS island , and IQ 6 / IQ 7 series microinverters are utility -interactive inverters. Generator Interface The Enpower smart switch includes a 60 A generator connection for qualified generators (reserved for future use). This document does not address this function, as the software functionality is not yet released. The Enpower smart switch does not support integration with third -party automatic transfer switches (ATS) for th e interconnection of generators. Third -party transfer switches and unqualified generators may be connected on the load side of the Enpower smart switch in compliance with NEC 705.2, and require isolating the Enphase DER equipment from the electrical system powered by unqualified generators. Such third -party transfer switches and accompanying generators cannot operate at the same time as Encharge storage systems and charge them. Note that M -Series , microinverter -based Ensemble systems , when used with a gene rator , require all PV to be wired via through the control terminals of the Envoy -S M etered. This is similar to how the Envoy -S Metered is used with M -Series microinverters for Power Ex port Limiting in the case of customer self -supply. Details can be seen in the Secondary Protection for Customer Self Supply Tech Brie f. Planning an Ensemble Technology System North America 14 © 20 20 Enphase Energy Inc. All rights reserved. December 8 , 2020 The Enphase Encharge 3 and Encharge 10 storage system units are reliable, smart, simple, and safe. They provide the lowest lifetime energy costs with backup for both new and retrofit solar customers. As an installer, you can qu ickly design the right system size to meet the needs of the homeowner. Each Encharge consists of a mounting bracket, battery unit with disconnecting means, and cosmetic cover. Model Number Description Shipment Contents ENCHARGE -3 -1P -NA Enphase Encharge 3 base kit with one 1.28 kVA, 3.36 * kWh, single phase battery unit with four integrated IQ8X -BAT microinverters and backup feature One box of Encharge 3 base kit Enphase Encharge 3 cover kit with Encharge 3 cover, mounting bracket, and screws One box of Encharge 3 cover kit ENCHARGE -10 -1P -NA Enphase Encharge 10 base kit with three 1.28 kVA, 3.36 * kWh, single phase battery units with 12 integrated IQ8X -BAT microinverters and backup feature Three boxes of Encharge 3 base kits Enphase Encharge 10 cover kit with Encharge 10 cover, mounting bracket, screws, two raceway joiners, set of wires for daisy chaining the three battery units One box of Encharge 10 cover kit *Note : When used with M -Series microinverters, the Encharge 3 has a usable capacity of 3.26kWh. The Encharge 10 with 3x Encharge 3 units, therefore, has a usable capacity of 9.78kWh. MECHANICAL DATA Encharge 3 Encharge 10 Dimensions (WxHxD) 14.45 in x 26.14 in x 12.56 in (36.7 cm x 66.4 cm x 31.9 cm) 42.13 in x 26.14 in x 12.56 in (107.0 cm x 66.4 cm x 31.9 cm) Weight One each 44.2 kg (97.4 lbs) base unit plus 8.4 kg (18.6 lbs) cover and mounting bracket; total 52.6 kg (116 lbs) Three each 44.2 kg (97 .4 lbs) base units plus 24.4 kg (53.8 lbs) cover and mounting bracket; total 156.9 kg (346 lbs) Enclosure Outdoor - NEMA 3R Ambient operating temperature range -1 5º C to 55º C (5º F to 131º F) non -condensing Optimum operating temperature range 0º C to 30º C (32º F to 86º F) Altitude Up to 2500 meters (8200 feet) Chemistry Lithium iron phosphate LiFePO 4 A n Enphase solar system with IQ series micros needs an IQ C ombiner with an IQ Envoy or a discrete IQ Envoy. An IQ Combiner consolidates interconnection equipment for the system and houses the following: Multiple PV branch circuits to ensure a streamlined installation and interconnection IQ Envoy This collects production and performance data from the storage system and from the IQ series microinverters. It then transmits the data to Enlighten through ethernet, Wi -Fi, and cellular. A standalone IQ Envoy can also be used if needed. Planning an Ensemble Technology System North America 15 © 20 20 Enphase Energy Inc. All rights reserved. December 8 , 2020 The IQ Combiner 3 -ES and the IQ Combiner 3C -ES include the consumption CTs. However, if using an existing IQ Envoy or IQ Combiner on a site that does not have the consumption CTs , a pair of consumption CTs (CT -200 -SPL IT) must be procured and installed. The IQ Combiner 3C -ES includes a cellular modem , so an Ensemble Communications Kit without a cellular modem (i.e. COMMS -KIT -01) can be used with this combiner for Ensemble installations Model Number Description Shipment Contents X -IQ -AM1 -240 -3 -ES AC c ombiner with IQ Envoy PCB, 80A, 240V split -phase Includes a pair of consumption CT's (CT -200 -SPLIT - Split -core current transformer, accuracy +/- 2.5%) Also includes a solar shield (XA -SOLARSHIELD -ES) that matches with the Ensemble aesthetics and deflects heat 1 Box of 1 Unit X -IQ -AM1 -240 -3C -ES AC c ombiner with IQ Envoy CR PCBA, 80A, 240V split -phase, with integrated CELLMODEM -M1, silver solar shield and includes 2x CT -200 -SPLIT 1 Box of 1 Unit ENV -IQ -AM1 -240 E nphase IQ Envoy, single phase, metered. Revenue grade accuracy (ANSI C12.20 +/- 0.5%) with calibrated solid -core CT . 1 Box of 1 Unit T he Enphase Envoy -S communications gateway delivers solar production and energy consumption data to Enphase and management of the Enphase Microinverter System. The Envoy -S M etered is packaged with one production current transformer to enable accurate production monitoring with an accuracy of +/-2.5%. For consumption monitoring, two consumption current transformers (CT -200 -SPLIT) must be purchased by the installer. Model Number Description Shipment Contents ENV -S -AM1 -120 Enphase Envoy -S, Metered. Single phase, Revenue grade accuracy (ANSI C12.20 +/- 0.5%) with Production CT 1 Box of 12 Units The Ensemble communication s kit includes the COMMS -KIT -01 and the CELLMODEM -M1. The COMMS -KIT -01 is plugged into a USB port on Envoy -S . It enables direct communication between the Encharge storage system, the Enpower smart switch, and the Envoy -S using 2.4 GHz frequency . The CELLMODEM -01 is a n LTE CAT -M1 cellular modem with a five -year AT&T data plan for Ensemble systems . It acts as a backup for a broadband Wi -Fi or Ethernet connection and ensures connectivity to the Enlighten cloud. If the site already has a cellular modem the COMMS -KIT -01 is also available independently. Model Number Description Shipment Contents COMMS -CELLMODEM -M1 COMMS -KIT -01: USB adapter kit for Envoy. Enables wireless communication with Encharge and Enpower CELLMODEM -M1: LTE CAT M1 cellular modem. When purchased as part of COMMS -KIT -M1 it includes a five -year data plan for Ensemble systems with up to 60 microinverters, 12 Encharge 3 batteries and one Enpower. Works in US, Puerto Rico, US Virgin Islands, Canada, and Mexico. 1 Box of 1 Unit COMMS -KIT -01 USB adapter kit for Envoy . Enables wireless communication with Encharge and Enpower 1 Box of 1 Unit Planning an Ensemble Technology System North America 16 © 20 20 Enphase Energy Inc. All rights reserved. December 8 , 2020 Enphase provides M -Series RMA SKUs based in the IQ7 hardware platform to replace M -Series microinverters that have failed or to expand an existing M -Series site. Note that you cannot mix IQ6 - and IQ7 -Series microinverters SKUs with M -Series microinverters at a site. You can only use the SKUs provided below with M -Series mic roinverters at a site. SKU Description M215240 -IQ7 -S22 -US M215 240VAC microinverter based on 7th g eneration IQ Series; MC locking connector, for existing M215 system expansion or replacing out -of -warranty M215 microinverters M215240 -IQ7 -S25 -US M215 240VAC microinverter based on 7th g eneration IQ Series; Amphenol H4 connector, for existing M215 system expansion or replacing out -of - warranty M215 microinverters M250240 -IQ7 -S22 -US M250 240VAC microinverter based on 7th g eneration IQ Series; MC locking connector, for existing M250 system expansion or replacing out -of -warranty M250 microinverters M250240 -IQ7 -S25 -US M250 240VAC microinverter based on 7th g eneration IQ Series; Amphenol H4 c onnector, for existing M250 system expansion or replacing out -of - warranty M250 microinverters W hen using the M -Series RMA SKUs you must use the Engage Cable and associated accessories. The following table lists these. SKU Description ET10 -240 -BULK Voltage type and conductor count: 240 VAC, four conductors Connector count: 240 PV module orientation: Portrait ET17 -240 -BULK Voltage type and conductor count: 240 VAC, four conductors Connector count: 240 PV module orientation: Landscape ET -SPLK -05 Pack of five Engage couplers. Used to connect two Engage Cables ET -CLIP -100 Pack of 100 steel clips to fasten the Engage Cable to racking ET -INSTL Includes: Pack of four ET -TERM terminators for Engage Cables One ET -DISC disconnect tool used to disconnect M -Series microinverters from Engage Cable Pak of five ET -SEAL sealing caps for unused connectors on the Engage Cable Note that the cables and accessories listed above are available only through the Enphase store. The following table lists the required components for installation of new systems and retrofitting an existing Enphase system: Component Name (Model Number) New System (Quantity) Retrofit IQ System (Quantity) Retrofit M215/M250 System (Quantity) Retrofit Enphase Non - IQ 6/7 and Non - M215/M250 System (Quantity) Energy Storage System (ESS) Encharge: Encharge -3 -1P -NA Encharge -10 -1P -NA Encharge 3s and Encharge 10s (See p airing chart for minimums) Encharge 3s and Encharge 10s (See pairing chart for minimums) Encharge 3s and Encharge 10s (See pairing chart for minimums) Encharge 3s and Encharge 10s (See pairing chart for minimums) Planning an Ensemble Technology System North America 17 © 20 20 Enphase Energy Inc. All rights reserved. December 8 , 2020 Component Name (Model Number) New System (Quantity) Retrofit IQ System (Quantity) Retrofit M215/M250 System (Quantity) Retrofit Enphase Non - IQ 6/7 and Non - M215/M250 System (Quantity) Microgrid Interconnection Device (MID) Enpower: EP200G101 -M240US00 1 1 1 1 Enpower Switch Main Breaker and/or Load Breaker Enpower Main Breakers: BRK -200A -2P -240V BRK -175A -2P -240V BRK -150A -2P -240V BRK -125A -2P -240V BRK -100A -2P -240V 0, 1 or 2 0, 1 or 2 0, 1 or 2 0, 1 or 2 Enpower Switch Circuit Breakers for PV and Encharge Circuits Enpower Circuit Breakers: BRK -20A -2P -240V -B BRK -30A -2P -240V BRK -40A -2P -240V BRK -50A -2P -240V BRK -60A -2P -240V BRK -80A -2P -240V 2 2 2 2 Ensemble Technology System Communications (b etween ESS, MID and Combiner) Ensemble Communications Kit: COMMS - CELLMODEM -M1 OR COMMS -KIT -01 (if system already has cellular modem or if using an IQ Combiner SKU that already has a cellular modem) 1 1 1 1 IQ Combiner IQ Combiner: X -IQ -AM1 -240 -3 -ES OR X -IQ -AM1 -240 -3C -ES 1 0 0 1 Standalone Gateway IQ Envoy for IQ series ENV -IQ -AM1 -240 1 (If not using IQ Combiner) 0 1 (If not already present on site) 0 Envoy -S Metered for M -S eries ENV -S -AM1 -120 0 0 1 (If not already present on site) 0 Consumption CTs Current Transformers: CT -200 -SPLIT 2 (If not using a new IQ Combiner that ships with consumption CTs) 2 (one for each phase) (If already have CTs) 2 (one for each phase) (If already have CTs) 2 (one for each phase) If system have CTs Microinverters IQ7 Series or IQ6 Series As needed per system design None needed unless expanding or replacing existing microinverters (comply with pairing ratio) N/A Upgrade to IQ7 or IQ 6 Series Microinverters needed (comply w/ pairing ratio) Planning an Ensemble Technology System North America 18 © 20 20 Enphase Energy Inc. All rights reserved. December 8 , 2020 Component Name (Model Number) New System (Quantity) Retrofit IQ System (Quantity) Retrofit M215/M250 System (Quantity) Retrofit Enphase Non - IQ 6/7 and Non - M215/M250 System (Quantity) M215/M250 M -Series RMA SKUs: M215240 -IQ7 -S22 -US M215240 -IQ7 -S25 -US M250240 -IQ7 -S22 -US M250240 -IQ7 -S25 -US N/A N/A None needed unless expanding or replacing existing microinverters (comply with pairing ratio) N/A PV Modules Any As needed per system design None needed unless expanding None needed unless expanding Existing or new panels Planning an Ensemble Technology System North America 19 © 20 20 Enphase Energy Inc. All rights reserved. December 8 , 2020 To ensure optimal wireless and power line communication between Ensemble system products and cleanest installation, consider the following: 1. Identify a suitable environment for temperature , enclosure ratings, and wall area, for secure mounting of the weight of the required Encharge storage system a nd Enpower smart switch units . 2. For wireless communications between the Envoy, Encharge storage system, and Enpower smart switch, the best practice is to have a line -of -sight between them. 3. For power line communications, the best practice is to have the Envoy located closest to PV branch circuit collection, for example in an IQ C ombiner or near/in a n off -the shelf PV combiner . 4. Determine the electrical interconnection points and required breakers for Enpower smart switch , Encha rge storage system circuit, PV combiner branch circuits, and the Envoy. 5. Ensure that the Envoy with both production and consumption CTs can be installed at the site. 6. Size conductors properly for ampacity and voltage regulation given conductor lengths. 7. Ident ify the location the PV system disconnect for r apid shutdown initiation and labeling. 8. Always ensure that the Envoy is connected to the internet via a Wi -Fi or ethernet connection. Note that the cellular modem is provided as a backup connection for internet connectivity. The following sections detail each of these considerations: 1. Fo r all products , always follow the instructions in the Enphase installation manuals . 2. Following local standards, choose a well -ventilated location where the ambient temperature and humidity are within e quipment spec ifications , preferably out of direct sunlight. The Encharge storage system b attery does not require additional ventilation as Lithium Iron Phosphate (LFP) chemistry used in battery cells does not off -gas. 3. Ensure that the mounting location can sustain the weight of the equipment , mounting equipment , and accessory equipment . 4. Plan the mounting location of Encharge : Minimum distance between Encharge units shall be 6 inches. Indoors: at least 15 cm (6 inches) of f the ground and 15 cm (6 inches) from the ceiling. Outdoors: at least 15 cm (6 inches) off the ground. If mounted in the path of a motor vehicle, we recommend a 91cm (36 inches) minimum mounting height 5. Plan the mounting location of Enpower : Indoors: at le ast 15 cm (6 inches) off the ground and 15 cm (6 inches) from the ceiling. Outdoors: at least 91cm (3 feet) off the ground. Indoors: at least 15 cm (6 inches) off the ground and 15 cm (6 inches) from the ceiling. Outdoors: at least 15 cm (6 inches) off th e ground. If mounted in the path of a motor vehicle, we recommend a 91cm (36 inches) minimum mounting height 6. Ensure that there are no pipes or electrical wires where you plan to drill. 7. Plan to maintain at least 90 cm (three feet) of clearance in front of E nsemble technology equipment for working space. 8. Consider the dimensions of the Ensemble equipment, easy access, height, and length of system conductors and conduit requirements between products and the system interconnection location when selecting the location of equipment. The r ecommended minimum spac ing is show n in the following f igure and t able . Conduit options are as follows: Enpower smart switch Main supply conductors may enter Enpower smart switch from the bottom or from the bottom -left side. Backup load conductors may enter Enpower smart switch from the bottom or bottom -right side. Encharge storage system and PV combiner a nd generator conductors may enter from the bottom, bottom -left or bottom -right sides. Encharge storage system Conduit may enter from the top right or top left of the Encharge storage system at the pre -defined knockout locations. IQ Combiner series Cond uit may enter at the bottom and sides or r ear entry below the busbar assembly . 9. Do not block vents. Planning an Ensemble Technology System North America 20 © 20 20 Enphase Energy Inc. All rights reserved. December 8 , 2020 Bracket Spacing Dimension Description Recommended Minimum A Enpower and Encharge horizontal bracket spacing B - Bottom aligned Enpower wall mount bracket bottom to Encharge wall mount bracket bottom 38 7 B - Center aligned Enpower wall mount bracket bottom to Encharge wall mount bracket bottom 26 1 mm (10 5/1 B - Top aligned Enpower wall mount bracket bottom to Encharge wall mount bracket bottom 13 5 mm (5 ) C Encharge wall horizontal bracket spacing Unlike other battery chemistries, an Encharge storage system does not require ven tilation for off -gassing and does not require active cooling. Encharge storage system batteries perform best when not subjected to extreme hot or cold temperatures and remain within the optimal temperature range of 0º C to 30º C (32º F to 86º F). Temperatu re may be affected by location, exposure, and ventilation. Consider factors that may result in undesirable temperature swings outside the optimal temperature range. For example, in enclosed unconditioned spaces such as garages or utility closets , the tempe rature may be higher than the outdoor ambient. For full installation instructions, always refer to the Enphase Installation Manuals, including the following documents: Quick Install Guide Install the Enphase Encharge Storage System Quick Install Guide Install the Enphase Enpower Smart Switch Figure 11: Bracket Spacing Planning an Ensemble Technology System North America 21 © 20 20 Enphase Energy Inc. All rights reserved. December 8 , 2020 Current Transformers (CTs) It is critical that installers correctly configure the Envoy, with the combined solar PV output passing through the p roduction CT. The p roduction CT monitors only the PV output circuit(s ) and must not have Encharge b attery circuit(s) installed on it. Insta ll the Encharge b attery circuit(s) on the load side of the production CTs on the correct terminals in Enpower smart switch . Installers may extend the c onsumption CT lead s, but not the p roduction CT lead s. Therefore, it is best to locate the Envoy close to the micro inverter output circuits and then extend c onsumption CT wires if necessary. Refer to the IQ Envoy Installation and Operations Manual or the En phase Envoy -S Installation and Operation Manual when installing and/or extending c onsumption CTs. R e fer also to the Tech Brief: Four Guidelines for Successful Current Transformer (CT) Installation . Enpower S mart S witch C onnections The Enpower smart switch can accept a maximum of 64 A of continuous output current (maximum 80A breaker) of a combined PV subpanel or IQ C ombiner (labeled AC Combiner). The busbar in the Enpower smart switch can accept a maximum of an 80 A breaker for the IQ C ombiner over current protection. The Enpower smart switch can accept a maximum of 64 A of rated output current (maximum 80A breaker) of combined Encharge storage system circuits. The busbar in the Enpower smart switch can accept a maximum of an 80 A br eaker for the Encharge storage system circuit over current protection. This equates to a maximum of twelve Encharge 3 storage units or four Encharge 10 units per Enpower. Up to six Encharge 3 storage units or two Encharge 10 units, equal to 32 A of rated o utput current, can be connected in series prior to landing on the Encharge terminal in the Enpower smart switch and protected by a no higher than a 40 A over current protection breaker. If more than six Encharge 3 storage systems (or more than two Encharge 10 storage systems) are to be connected to Enpower smart switch, an external subpanel must be used to combine each circuit of up to 32 A of rated output current Encharge storage system circuits. You should size conductors appropriately for the overcurrent protection selected for the application. When the Encharge storage system is charging, it acts like a load , and the voltage decreases at the terminals of the arge storage system is discharging to feed loads, it behaves like a source, and the voltage increases at the terminals of the battery. The voltage rise to voltage drop delta divided by the nominal voltage is roughly equivalent to voltage regulation. Sinc e the peak charge and discharge values for Encharge are the same value, voltage rise and voltage drop will be the same value. Voltage regulation in Ensemble is calculated as w here : is t he v oltage change from 0 to max current out of Encharge , and is the nominal RMS voltage. Ensure that the Encharge storage system conductors are sized correctly for the number of units on the circuit and voltage regulation does not exceed 1% between the first Enchar ge storage system and Enpower smart switch. 2017 NEC 690.12 requires a rapid shutdown for PV Systems on buildings by an initiation device in a readily accessible location. In grid interactive systems this is often the service disconnecting means or PV system disconnect. Rapid shutdown requirements d o not apply to optional standby systems such as energy storage and as seen in Figure 1, the PV system disconnect can still initiate rapid shutdown. The rapid shutdown initiation device can be either: - the PV system breaker in Enpower, - an additional disconnect such as a fusible disconnect between Enpower and the IQ Combiner, or - the circuit breakers in the IQ C ombiner since these breakers are less than six and grouped. The rapid shutdown initiator must be labeled in accordance with 2017 NEC 690.56. Enphase IQ 6 / 7 series and M215 and M250 micro inverters comply with the rapid shutdown requirements per the UL certifications. Planning an Ensemble Technology System North America 22 © 20 20 Enphase Energy Inc. All rights reserved. December 8 , 2020 distributed energy resource (DER): A source of electric power that is not directly connected to a bulk power system. DER includes both generators and energy storage technologies capable of exporting active power to an EPS. An interconnection system or a supplemental DER device that is necessary for compliance with this standard is part of a DER. (IEEE 1547 -2018) intentional island: A n intentionally planned electrical island that is capable of being energized independently of the area electric power system (EPS). Enpower and Encharge comprise a microgrid system that form s an intentional island totally within the bounds of the Local EPS. (2017 NEC/IEEE 1547 -2018 /IEEE 1547.1 -2011 ) main load panel : A lso referred to as the main load center or main panelboard, this is the unit where the majority of load circuits for the premises have over current protection. microgrid interconnect device (MID): A device that allows a microgrid system to separate from and reconnect to a primary power source. (NEC 705.2) microgrid syste m : A premises wiring system that has generation, energy storage, and load(s), or any combination thereof, that includes the ability to disconnect from and parallel with the primary source. (NEC 705.2) multimode inverter: Equipment having the capabilities of both the interactive inverter and the stand -alone inverter. (NEC 705.2) s ervice : T he conductors and equipment for delivering electric energy from the serving utility to the wiring system of the premises served. (NEC CMP -4) service equipment: The necessary equipment, usually consisting of a circuit breaker(s) or switch(es) and fuse(s) and their accessories, connected to the load end of service conductors to a building or other structure, or an otherwise designated area and intended to constitute the main control and cutoff of the supply. (NEC CMP -4) voltage regulation: The measure of change of voltage magnitude in a component such as a feeder. Poor voltage regulation may result in unwanted behavior such as dimming lights or flicker. Figure 12 : NEC 2017 Figure 203.1 Services © NFPA Planning an Ensemble Technology System North America 23 © 20 20 Enphase Energy Inc. All rights reserved. December 8 , 2020 Planning an Ensemble Technology System North America 24 © 20 20 Enphase Energy Inc. All rights reserved. December 8 , 2020 Planning an Ensemble Technology System North America 25 © 20 20 Enphase Energy Inc. All rights reserved. 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