Photovoltaic inverter grid overvoltage alarm

Why is my inverter 'alarm' & 'grid over voltage'?

Upon regaining electricity, we noticed that our inverter was constantly in 'Alarm' status, with 'Grid over Voltage' being the warning. Ever since, it's been in the same status for about 10 out of the 12 hours of the day we have available. Obviously this is not ideal because we are not generating any electricity.

How does a PV inverter work?

Quick brief. To 'pump' the PV leccy into the house and out onto the grid (when excess) the inverter monitors the grid voltage and pushes the AC out at about 2V higher. Effectively, PV households will push local voltage up a smidge.

Why do PV inverters have to shut down before switching back on?

Effectively, PV households will push local voltage up a smidge. So, to avoid a vicious circle, when the grid voltage reaches 253V (UK DNO's have (by law) to maintain a voltage of 230V -6%/+10%) inverters have to shutdown, and monitor the voltage, before switching back on when it's gone down.

Why is my inverter overvoltage?

For overvoltage, it may be necessary to find a qualified electrician to investigate. Two possibilities spring to mind: Voltage drop along the wiring from the mains supply to the inverter, because it is too thin or too long.

How do I change the display value of the grid voltage?

Modify the display value of the grid voltage through the compensation parameter setting in the inverter Main Menu→Advanced Settings→Password 0010→Compensation Set→Voltage Parameter→Setting value of Vg-A-Zero, Vg-B-Zero, Vg-C-Zero→Save & Send.

Who are Solis solar inverters?

Solis is one of the world's largest and most experienced manufacturers of solar inverters supplying products globally for multinational utility companies, commercial & industrial rooftop projects, and residential solar systems.