Photovoltaic inverter reports low insulation impedance

What happens if the ground resistance of a solar inverter is too low?

If the ground resistance of a PV string connected to a solar inverter is too low, the solar inverter generates a Low Insulation Resistance alarm. A short circuit occurs between the PV array and the ground. The ambient air of the PV array is damp and the insulation between the PV array and the ground is poor.

How do I find a ground insulation fault in a solar inverter?

If two or more ground insulation faults occur in a single PV string, the following method cannot locate the fault. You need to check the PV modules one by one. The AC power supply is connected, and set the DC switch at the bottom of the solar inverter to OFF. Connect each PV string to the solar inverter and set the DC switch to ON.

How do I check if my solar inverter is low insulation resistance?

If the Low Insulation Resistance alarm is not reported one minute after the DC is supplied, choose Device Commissioning > Maintenance > Inverter ON/OFF on the app and send a shutdown command. Set the DC switch to OFF and go to Step 2 to connect another PV string to the solar inverter for a check.

Can a transformer-less inverter cause DC leakage to ground?

Introduction: In photovoltaic systems with a transformer-less inverter, the DC is isolated from ground. fault can cause DC c urrent leakage to ground (PE - prote ctive earth). Such a fault is also called an isolation fault. troubleshoot an insulation fault in a PV system. rainy days. The mess age is “Fault – Insulation ”.

How do I know if my inverter has an Isolation Fault?

You can identify an isolation fault using either SetAPP or the inverter LCD display. An isolation fault may disappear and recur after a short period (especially if it is caused by morning moisture), therefore it is recommended to troubleshoot the fault as soon as it occurs before it disappears.

How do I check if a PV string is low insulation resistance?

If the Low Insulation Resistance alarm is not reported one minute after the DC is supplied, the inspection on the PV string is complete. Choose Device Commissioning > Maintenance > Inverter ON/OFF on the app and send a shutdown command. Set the DC switch to OFF. Go to Step 2 to check other PV strings.