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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 />Integrated Battery CTs <br />Integrated Production CT <br />Integrated <br />Consumption CTs <br />Main DER <br />breaker <br />Integrated Backfeed CTs <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 />NEM Integrity <br />Mode <br />Figure 13: NEM Integrity Mode in grid-forming configuration – IQ Meter Collar placed between the main service breaker and the <br />meter <br />5.5.3 Compliance with regulations <br />In California, Enphase installers can configure the NEM Integrity Mode required by the utility using <br />the Enphase Installer App or the Enphase Installer Portal. The Enphase Energy System automatically <br />curtails PV and battery production to ensure compliance with local jurisdictional requirements. <br />NEM Integrity Mode is certified under UL 3141 v2 and meets the performance requirements of <br /><2-second response time and <10-second settling time (i.e., time to reach steady state), making it <br />compliant with Rule 21 for Non-Export systems. <br />NOTE: NEM Integrity Mode operates on an aggregate basis across all phases. <br />Enphase Power Control features <br />45 © 2025 Enphase Energy Inc. All rights reserved. August 2025 <br />TEB-00269-2.0-EN <br />5.5.4 Failure modes and resolution <br />Table 7: Failure modes and resolution mechanisms <br />Failure mode Resolution mechanism <br />One or more microinverters failed or stopped <br />communicating with the IQ Gateway <br />If the IQ Gateway loses communication with a <br />PV microinverter for more than 30 seconds, the <br />microinverter automatically curtails its output current <br />to the static safe limit (0 watts). <br />Consumption CTs or IQ Meter Collar not <br />reporting correct values, or missing Consumption <br />CTs/IQ Meter Collar <br />PV production from each microinverter automatically <br />defaults to the safe limit (0 watts). IQ Batteries <br />transition to an idle state (neither charging nor <br />discharging). <br />PCS controller or IQ Gateway failure <br />If the PCS controller or IQ Gateway fails, PV <br />production curtails to the static safe limit (0 <br />watts) within 30 seconds of losing communication. <br />IQ Batteries move to an idle state (neither charging <br />nor discharging). <br />5.5.5 Configuring NEM Integrity Mode through the Enphase Installer App <br />NEM Integrity Mode is automatically configured through the Enphase Installer App in the following <br />cases: <br />•For a non-Enphase existing system: During initial site setup, select NEM-Multitariff 0-Export (Add- <br />on) under Grid Connection Type. <br />•For an existing Enphase PV system: When adding an additional IQ Gateway or IQ Combiner 6 <br />under Devices, an option to select NEM-MT is shown. <br />In either case, NEM Integrity Mode is automatically enabled by setting a zero-export limit for the <br />new system, ensuring that the overall system never exports more power than the existing PV system <br />produces. <br />The following figure shows the configuration screen where NEM Integrity Mode is set using either <br />method. <br />Enphase Power Control features <br />46 © 2025 Enphase Energy Inc. All rights reserved. August 2025 <br />TEB-00269-2.0-EN