About How to detect grounding of photovoltaic panels
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 .
To determine the source of a ground fault:Ensure the inverter is isolated from the array by removing the positive and negative conductors;Close the DC disconnect to put a live voltage on the conductors;Measure the voltage between the positive and negative conductors to determine the open circuit voltage of the array; andMeasure positive to ground and negative to ground.
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