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Existing AC Coupled <br />PV System <br />Main panel <br />(Back-fed panel) <br />IQ Series Microinverters <br />N <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 />Main DER <br />breaker <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 <br />( C C B ) <br />Integrated Production CT <br />Integrated Battery CTs <br />Gateway <br />1 2 3 4 D 1 2 3 4 D <br />CT8(L2) <br />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 />IQ Battery <br />Oversubscription <br />Home loads <br />Connect to EVSE <br />CT connector on <br />the gateway <br />11 <br />Utility meter Grid <br />IQ Battery IQ Battery <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 />CT9, CT10 <br />(L1,L2) <br />Consumption CTs <br />1 <br />2 Battery Import/Export <br />Only Mode <br />4 <br />3b <br />3a <br />Aggregate Power <br />Export Limit <br />5 NEM Integrity <br />Mode <br />Main Panel Upgrade Avoidance <br />with Feeder Control <br />Main Panel Upgrade Avoidance <br />with Busbar Overload Control <br />Integrated Backfeed CTs <br />IQ EV Charger <br />8 <br />CT11, CT12 L1, L2 <br />Connect to <br />LC CTs/Cons CTs <br />connector <br />Connect to <br />LC CTs/Cons CTs <br />connector <br />8 <br />Figure 1: Example of an Enphase Energy System in grid-tied configuration <br />Enphase Power Control enables five features with Enphase Energy System in grid-tied configuration: <br />•IQ Battery Over-Subscription Mode (1): This feature limits the charge/discharge current and <br />enables more battery capacity to be installed in grid-tied systems. The feature ensures that the <br />total continuous output current from the batteries does not exceed 80% of the battery breaker <br />rating. <br />•Battery Import/Export Only Mode (2): <br />•The import-only mode (also called non-exporting) ensures the IQ Battery never exports any <br />power to the grid. <br />•The export-only mode (also called charge from PV-only) ensures that the IQ Battery never <br />imports any power from the grid, but can export to the grid. IQ Battery can operate either in <br />battery import-only mode or battery export-only mode. <br />•Main Panel Upgrade Avoidance (MPUA) mode with: <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 />Supported configurations for Enphase Power Control <br />5 © 2025 Enphase Energy Inc. All rights reserved. August 2025 <br />TEB-00269-2.0-EN <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 />to the grid is limited to the Aggregate Power Export Limit (PEL) defined by the installer. <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 />2.3 Enphase Power Control in a grid-forming Enphase Energy System <br />A typical Enphase Energy System (EES) in a grid-forming configuration has the following components: <br />•IQ8 Series Microinverters <br />•IQ Battery <br />•IQ Combiner 6C <br />•IQ Meter Collar <br />Enphase Power Control enables four features for grid-forming EESs with IQ Battery 10C, as shown <br />in the following figure. This figure provides a bird’s-eye view of the point of current being measured/ <br />monitored and limited using Enphase Power Control for each feature. <br />Supported configurations for Enphase Power Control <br />6 © 2025 Enphase Energy Inc. All rights reserved. August 2025 <br />TEB-00269-2.0-EN