About Photovoltaic inverter grounding test
How to test energized DC PV string circuits with ground faultsUnderstand expected values before you begin Before testing to identify the location of a ground fault, you need to know what measurement values to expect — specifically voltage. De-energize and lockout/tagout (LOTO) where you're working . Inspect the PV array visually . Test for current on each string first, then open fuse holders . Test PV string voltage .
How to test energized DC PV string circuits with ground faultsUnderstand expected values before you begin Before testing to identify the location of a ground fault, you need to know what measurement values to expect — specifically voltage. De-energize and lockout/tagout (LOTO) where you're working . Inspect the PV array visually . Test for current on each string first, then open fuse holders . Test PV string voltage .
If you are unsure whether your solar inverter system is using negative or positive grounding, there are a few ways to determine the grounding type:Check the system documentation and specifications provided by the manufacturer or installer. Visually inspect the grounding connections at the inverter. Use a multimeter to test for continuity between the grounding conductor and the negative or positive terminal. Consult a qualified solar professional or electrician. .
Disconnect the inverter from all voltage sources ( > Disconnecting the Inverter from Voltage Sources). Measure the voltage between the positive terminal and the ground potential (PE).
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