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.
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About How to measure the grounding of photovoltaic inverters

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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