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Wireman · Solar, batteries & EV troubleshooting · 2023 NEC ·

Solar, batteries & EV

Inverters, PV strings, storage, EV chargers.

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PV inverter not producingGrid present, AC breaker, rapid shutdown, DC input or just monitoring: find where production stops.Up to 6 steps PV ground fault or arc-fault alarmInsulation and arc faults on the DC side: moisture, damaged wire, bad connectors and how to isolate the string.Up to 4 steps One PV string producing lowCompare strings at the same moment to tell shading, a dead module, a bypass diode or a bad connection apart.Up to 4 steps Rapid shutdown won’t releaseInitiator, the signal to the module electronics, and incompatible or failed devices.Up to 4 steps Battery system won’t charge or dischargeSettings, state of charge, temperature and communication before suspecting hardware.Up to 5 steps EV charger won’t chargePower to the charger, ground, receptacle condition, the charger’s fault light, and the car’s own settings.Up to 4 steps EV charger trips its ground-fault protectionUpstream GFCI vs the charger’s own protection, wiring mistakes, water and the car itself.Up to 4 steps EV charging slower than expectedLevel 1 vs Level 2, the charger setting, the car’s limits, 208 V vs 240 V and battery temperature.Up to 4 steps