About How to test the ground connection of photovoltaic inverter
Disconnect the inverter from any voltage sources (see the inverter installation manual). Measure the voltage between the positive terminal and the ground potential (PE).
Disconnect the inverter from any voltage sources (see the inverter installation manual). Measure the voltage between the positive terminal and the ground potential (PE).
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. .
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.
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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