About How to measure the grounding of photovoltaic inverters
Disconnect the DC switch of each PV string connected to the inverter, and use a multi-meter to measure the voltage of the PV+ to ground and PV- to ground of each string.
Disconnect the DC switch of each PV string connected to the inverter, and use a multi-meter to measure the voltage of the PV+ to ground and PV- to ground of each string.
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 .
Connect the positive and negative output connectors of a PV string to a branch cable, and use an insulation resistance tester to test the insulation resistance of the PV string cable to the ground:.
Using a digital multimeter (DMM), technicians should measure voltage from positive to negative, positive to ground, and negative to ground.
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