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IQ EV Charger <br />N13 <br />RS+GNDRS- <br />NO <br />NC <br />C <br />EIP comm. LED <br />USB1 <br />USB2 RSD LED <br />Status LED <br />Reset <br /> button <br />AP mode LED <br />AP mode button <br />Power production LED <br />Device comm. LED <br />Device scan button <br />Backfeed lugs <br />with DER relay <br />PV bus DER bus <br />DER centre <br />IQ PV2 <br />IQ PV3 <br />IQ PV1 <br />11 <br />_ <br />N <br />3 4 <br />12 <br />A1 <br />5 6 7 8 <br />910 <br />A2 <br />Combiner Controller Board (CCB) <br />Gateway <br />1 2 3 4 D 1 2 3 4 D <br />CT8(L2)IQ PV4 <br />IQ B2 <br />IQ B1 <br />IQ EVC <br />PVA <br />PF <br />CT2, CT3 <br />CT1 <br />CT4, CT5 <br />CT(L1)CT(L1)CT(L2)CT (L2) <br />IQ Combiner 6C <br />Load Controller <br /> <br />B1 <br />LCB <br />CT6, CT7 <br />1 <br />1 2 3 4 D <br />2 <br />1 2 3 4 D <br />N <br />Grid <br />Backed up <br />Home loads <br />IQ BatteryIQ Series Microinverters IQ Battery <br />Connect to EVSE <br />CT connector on <br />the gateway <br />IQ Battery <br />Oversubscription1 <br />Integrated Battery CTs <br />Integrated Production CT <br />Integrated <br />Consumption CTs <br />2 Battery Import/Export <br />Only Mode <br />4 Aggregate Power <br />Export Limit <br />3a Main Panel Upgrade Avoidance <br />with Busbar Overload Control <br />3b Main Panel Upgrade Avoidance <br />with Feeder Control <br />Main DER <br />breaker <br />Integrated Backfeed CTs 11 <br />Main-meter combo <br />with IQ Meter Collar <br />behind the utility meter <br />(back-fed panel) <br />Existing AC Coupled <br />PV System <br />5 NEM Integrity <br />Mode <br />Integrated LC <br />CTs <br />Figure 2: Example of an Enphase Energy System in grid-forming configuration with IQ Meter Collar installed in a main meter <br />combo <br />•IQ Battery Over-Subscription Mode (1): This feature limits the charge/discharge current and allows <br />for more battery capacity to be installed on Storage breaker slot 1 and Storage breaker slot 2 in <br />grid-forming systems than allowed based on the installed breaker rating. The feature ensures that <br />the total continuous output current from the batteries does not exceed 80% of the battery breaker <br />rating. <br />•Battery Import/Export Only Mode (2): The battery import-only feature ensures the IQ Battery <br />never exports any power to the grid. The battery export-only feature ensures that the IQ Battery <br />never imports any power from the grid, but can export to the grid. IQ Battery can operate either in <br />the battery import-only mode or the battery export-only mode. <br />•MPU avoidance mode with: <br />Supported configurations for Enphase Power Control <br />7 © 2025 Enphase Energy Inc. All rights reserved. August 2025 <br />TEB-00269-2.0-EN <br />•Busbar Overload Control (3a): This feature reduces the system payback period by allowing <br />maximum renewable energy generation and helps avoid the cost of panel upgrades for large PV <br />and battery systems. <br />•Feeder Control (3b): This feature enables avoiding the cost of panel upgrades for large PV and <br />battery systems. <br />•Aggregate Power Export Limit Mode (4): This feature ensures that the aggregate power exported <br />as measured at the IQ Meter Collar is limited to the power export limit (PEL) value set by the <br />installer. <br />NOTE: Enphase PV production and battery discharge ensure that the aggregate export <br />power adheres to the limit regardless of whether the battery is in export-only or import- <br />only mode. <br />•NEM Integrity Mode (5): This feature ensures that the total system exports no more power <br />than the existing PV system, dynamically maintaining NEM integrity in jurisdictions like California, <br />particularly for homeowners applying under the NEM Multi-Tariff (NEM-MT). <br />3. Benefits of Enphase Power Control <br />3.1 Avoid costly interconnection equipment upgrades or installations <br />In the absence of the Enphase Power Control feature (battery import only mode), utilities in California, <br />such as Pacific Gas & Electric (PG&E), San Diego Gas & Electric (SDG&E), and Southern California <br />Edison (SCE) may require the installation of an additional net generation output meter (NGOM). This <br />increases the cost of installation of the system for the homeowner. To avoid this additional cost, the <br />homeowner may have to limit their battery to under 10 kW, which may not be sufficient for backing <br />up their home loads. With the Enphase Power Control feature —battery import-only mode, no such <br />trade-off is required when installing an Enphase Energy System. <br />Utilities such as PG&E require energy storage systems to comply with the import-only mode with an <br />open loop response time (OLRT) of less than two seconds. If the energy storage system complies <br />with this requirement, the utility considers it non-exporting and may not require a feeder transformer <br />upgrade in cases where the addition of an energy storage nameplate exceeds the thermal rating of <br />the feeder transformer. <br />3.2 Benefit from a smaller payback period <br />The Enphase Power Control feature, battery export-only mode, allows homeowners in the jurisdiction <br />with NEM 3.0 to charge their IQ Battery from the PV and discharge to their home loads and to <br />the grid. Homeowners can benefit from a lower payback period by storing excess PV power during <br />off-peak hours and discharging the stored energy to the grid during the time when it is most beneficial <br />to the homeowner based on the import and export tariff rates. <br />The Enphase Power Control feature, MPU avoidance with Busbar Overload Control, allows maximum <br />utilization of available renewable energy while avoiding the cost of main panel upgrades and reducing <br />the payback period for the homeowner. <br />Supported configurations for Enphase Power Control <br />8 © 2025 Enphase Energy Inc. All rights reserved. August 2025 <br />TEB-00269-2.0-EN