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4. Power Control System integration in the Enphase Energy System Enphase Power Control is a supplementary Power Control System. Supplementary Power Control Systems are systems or devices for use in circuits with an overcurrent device suitable for service, feeder, or branch circuit protection. 4.1 Components of Enphase Power Control •Current transformers (CTs): An Enphase Power Control-enabled site would require •A Production CT (integrated with the IQ Combiner 6C: X-IQ-AM1-240-6C). The Production CT provides revenue-grade metering of the power generated by the PV. •IQ Meter Collar with integrated Consumption CTs: MC-200-011-V01 or a set of two Consumption CTs: CT-200-CLAMP to be purchased separately. IQ Meter Collar (MC-200-011-V01) has integrated consumption metering and can be installed inside the main meter combo or can be installed in a Form 2S socket for measuring the current being exported to the grid or to the backup panel in real-time. Alternatively, in some configurations, Consumption CTs are installed inside the main panel to monitor the current being exported to the grid in real time. •A Battery CT (integrated with the IQ Combiner 6C: X-IQ-AM1-240-6C). •Power control system controller (IQ Gateway): An Enphase Power Control-enabled site incorporates the IQ Gateway to support IQ Microinverter and IQ Battery Systems. The IQ Gateway monitors the currents as reported by the CTs/IQ Meter Collar and uses this information to limit PV and ESS power production as required. •IQ Battery: Enphase Power Control ensures that the IQ Battery does not export any power to the grid when the battery import-only mode is enabled and that the IQ Battery does not import any power from the grid to charge when the battery export-only mode is enabled. •Other balance of system components: •IQ Combiner: Aggregates PV branches and energy storage. Enphase Power Control can limit the backfeed into the main panel from the IQ Combiner, per NEC requirements in grid-tied and grid-forming systems. NOTE: The IQ Combiner includes an integrated IQ Gateway, the Power Control System controller. IQ Gateway need not be repurchased if an IQ Combiner is already present at a site. •IQ Meter Collar: Integrates a microgrid interconnect device (MID) and consumption metering in grid-forming systems. •IQ EV Charger: Charges the electric vehicle (EV). It enables the Enphase Power Control feature, IQ EVSE MBTA, to control the EV charge current such that the total import current from the grid for supplying the home loads and for charging the electric vehicle together does not exceed the limit enforced by the main service breaker rating. Power Control System integration in the Enphase Energy System 11 © 2025 Enphase Energy Inc. All rights reserved. August 2025 TEB-00269-2.0-EN 4.2 Setting up Enphase Power Control 4.2.1 Installation of IQ Combiner 6C and IQ Meter Collar in grid-forming configuration for Enphase Power Control In the grid-forming configuration, the IQ Combiner 6C must be paired with the IQ Meter Collar. For detailed instructions on installing the IQ Meter Collar in a grid-forming configuration, refer to the IQ Combiner 6C quick install guide (QIG) . The QIG contains detailed information required for installers to install the IQ Meter Collar in the main meter combo or in a discrete Form 2S meter pan and to enable Enphase Power Control and provides information on the labels required to be added to the Power Control System-enabling devices by the installer. These labels are shipped inside the literature kit as a part of the IQ Combiner 6C. The high-level diagram of IQ Combiner 6C and IQ Meter Collar installation in a main meter combo in a grid-forming whole home backup configuration is shown in Enphase Power Control in a grid-forming Enphase Energy System on page 6. The high-level diagram of IQ Combiner 6C and IQ Meter Collar installation in a discrete Form 2S socket in a grid-forming whole home backup configuration is shown in the following figure. Power Control System integration in the Enphase Energy System 12 © 2025 Enphase Energy Inc. All rights reserved. August 2025 TEB-00269-2.0-EN