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5.2 Battery import/export-only mode for Enphase Energy System.................................................23 <br />5.2.1 Battery import-only mode...........................................................................................................23 <br />5.2.2 Battery export-only mode........................................................................................................... 24 <br />5.2.3 Operation of battery import/export-only mode with other Enphase Power Control <br />features........................................................................................................................................... 24 <br />5.2.4 Configuring battery import/export-only mode via the Enphase Installer App..................24 <br />5.3 MPU avoidance....................................................................................................................................25 <br />5.3.1 Compliance with regulations......................................................................................................25 <br />5.3.2 MPU avoidance using Busbar Overload Control.....................................................................26 <br />5.3.3 MPU Avoidance with Feeder control (using NEC 120% or current limit directly <br />entered)...........................................................................................................................................29 <br />5.3.4 Failure mode and resolution for MPU avoidance.................................................................... 33 <br />5.3.5 Configuring MPU avoidance through the Enphase Installer App........................................ 33 <br />5.3.6 Configuring MPU avoidance through the Enphase Installer Portal.....................................36 <br />5.3.7 Accounting for currents due to reactive power in the system..............................................37 <br />5.4 Aggregate power export limit...........................................................................................................38 <br />5.4.1 Aggregate power export limit in the grid-tied configuration................................................38 <br />5.4.2 Aggregate power export limit in the grid-forming configuration.........................................39 <br />5.4.3 Compliance with regulations......................................................................................................40 <br />5.4.4 Failure modes and resolution.......................................................................................................41 <br />5.4.5 Configuring aggregate power export limit feature through the <br />Enphase Installer App....................................................................................................................41 <br />5.4.6 Configuring aggregate PEL feature through the Enphase Installer Portal........................ 42 <br />5.5 NEM Integrity Mode............................................................................................................................43 <br />5.5.1 NEM Integrity Mode in grid-tied configuration........................................................................43 <br />5.5.2 NEM Integrity Mode in grid-forming configuration.................................................................44 <br />5.5.3 Compliance with regulations......................................................................................................45 <br />5.5.4 Failure modes and resolution......................................................................................................46 <br />5.5.5 Configuring NEM Integrity Mode through the Enphase Installer App................................. 46 <br />5.5.6 Configuring NEM Integrity Mode through the Enphase Installer Portal..............................47 <br />6 Revision history...............................................................................................................48 <br />Contents <br />3 © 2025 Enphase Energy Inc. All rights reserved. August 2025 <br />TEB-00269-2.0-EN <br />1. Introduction to Enphase Power Control <br />Power Control Systems (PCS), as defined in NFPA 70, National Electrical Code 2020 Edition, control <br />the output of one or more power production sources, energy storage systems (ESS), and other <br />equipment. Power Control Systems can be used in a variety of use cases, for example, to limit current <br />and loading on the busbars and conductors supplied by the power production sources and/or energy <br />storage systems. Enphase Power Control implements power control that complies with the UL 1741 <br />Certification Requirement Decision (CRD) and UL 3141 Outline of Investigation for Power Control <br />Systems. <br />The 4th-generation Enphase Energy System (EES) has interconnected electric power production <br />sources, such as microinverters and/or IQ Batteries. The amount of power production sources <br />connected to a system is generally governed by various sections of the NEC. <br />Power Control System integration allows flexible installation of Enphase systems with minimal <br />additional homeowners costs (for example, install more PV or batteries) or comply with special <br />requirements in certain jurisdictions. This technical brief describes the benefits and implementation <br />details of Power Control System integration for real-time current monitoring and export limits. <br />Distributed energy resources (DER), mentioned in this document, refer to smaller generation units <br />located on the consumer’s side of the meter, such as rooftop photovoltaic (PV) units, battery storage <br />units, third-party generators, and other units. <br />2. Supported configurations for Enphase Power Control <br />2.1 Overview of the Enphase Energy System <br />An Enphase Energy System can be classified into two configurations: <br />•Grid-tied or non-backup systems: In a grid-tied system, Enphase microinverters and (optional) <br />IQ Batteries will need the grid to be available to keep producing power or discharging to the loads. <br />•Grid-forming or backup systems: Microinverters and IQ Batteries in a grid-forming system do not <br />depend on the grid to keep producing power or to discharge the loads. An additional Microgrid <br />Interconnect Device (MID) is required for these types of systems, for example, IQ Meter Collar. <br />Both configurations support the Enphase Power Control features. The features supported in each <br />configuration are discussed in the following sections. <br />2.2 Enphase Power Control in a grid-tied Enphase Energy System <br />An Enphase Energy System in a grid-tied configuration has the following components: <br />•IQ8 Series Microinverters <br />•(Optional) IQ Battery <br />•IQ Combiner 6C <br />The following figure provides a bird's-eye view of the point of current being measured and limited <br />using Enphase Power Control for each feature. <br />Introduction to Enphase Power Control <br />4 © 2025 Enphase Energy Inc. All rights reserved. August 2025 <br />TEB-00269-2.0-EN