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5.2 Battery import/export-only mode for Enphase Energy System Enphase IQ Batteries can operate either in the battery import-only mode or in the battery export-only mode. NOTE: Battery modes are selectable only if the battery installation is in California. 5.2.1 Battery import-only mode The import-only mode feature for IQ Battery 10C ensures that the battery never exports power to the grid. The feature is certified for any systems that have a UL Listed PV inverter. System sizing for battery import-only mode with IQ Battery 10C Enphase Power Control with battery import-only mode ensures no IQ Battery current is exported to the main panel. This is accomplished by measuring and controlling all production current and power. Enphase Power Control ensures that the current at the Consumption CTs never exceeds the PV production current, thus never exporting battery current past the Consumption CTs. In the battery import-only mode, the Enphase Energy System does not export battery current past the Consumption CTs. Therefore, the current from IQ Batteries need not be accounted for when calculating the current exported to the grid by the system. As a result, installers only need to account for the size of the PV system while calculating export, and need not account for the size of the IQ Battery system installed. This saves labor and upgrade costs for installers and system owners. NOTE: Power Control System is covered in Article 705.13 of the NEC 2020 edition. Authorities Having Jurisdiction (AHJs) may not recognize the Power Control System feature until the 2020 NEC is adopted in their region. Open loop response time The maximum open loop response time (OLRT) with battery import-only mode in the Enphase Energy System is less than two seconds. Enphase Power Control features 23 © 2025 Enphase Energy Inc. All rights reserved. August 2025 TEB-00269-2.0-EN 5.2.2 Battery export-only mode Battery export is the only mode for IQ Battery 10C that allows the IQ Battery to export to the grid. This feature is certified with any UL Listed PV inverters. Homeowners can leverage this feature to lower their payback period on their solar plus battery systems, as Enphase ensures that the IQ Battery stores the excess PV production and exports to the grid when it is most beneficial to the homeowner based on the import and export tariff rates. System sizing for battery export-only mode with IQ Battery 10C Enphase Power Control with Battery export-only mode ensures that the IQ Battery never imports from the grid. It is performed by ensuring that the battery charge current measured at the Battery CT is always less than the PV production current measured at the Production CT. Battery discharge is only ensured to obey other Power Control System features. In Battery export-only mode, as Enphase Energy System exports battery current to the grid, the current from IQ Batteries must be accounted for when calculating the current exported to the grid by the system. However, the Battery export-only mode can be paired with other Enphase Power Control features that allow for the installation of large Enphase solar plus battery systems without the need for main panel upgradation costs or additional labor costs if the Enphase system has IQ8 Series Microinverters. Open loop response time The maximum open loop response time (OLRT) with battery export mode in the Enphase Energy System is less than two seconds. 5.2.3 Operation of battery import/export-only mode with other Enphase Power Control features Battery import/export-only mode works in conjunction with other Enphase Power Control features— IQ Battery over-subscription, MPU avoidance, and Aggregate Power Export Limit. Enphase Energy System ensures that the power control limits set with respect to the other features are adhered to when the battery export or import-only modes are enabled. 5.2.4 Configuring battery import/export-only mode via the Enphase Installer App Under System Details, go to PCS based Limiting > Battery Mode. Then, select Import Only or Export Only. The battery mode selection expires in seven days, starting from the selection of the tariff structure. The selection of mode is not possible in the Enphase Installer App if seven days have elapsed after the selection of the tariff structure. NOTE: Battery export-only mode is currently only available in jurisdictions with Net Energy Metering 3.0 (NEM 3.0). In jurisdictions other than NEM 3.0, the battery mode is set to battery import-only mode by default. Enphase Power Control features 24 © 2025 Enphase Energy Inc. All rights reserved. August 2025 TEB-00269-2.0-EN