Homeowner Blog

PV Troubleshooting - High Voltage

Erica Charles · 13 Jul 2017

Have you checked your solar monitoring system recently?

High grid voltage could be affecting the performance of your solar PV

Does your solar monitoring graph look like this? It could be due to high incoming voltage. This year is the first year that we have seen PV issues that relate to high voltage. This occurs when  the voltage limits that have been set up on your inverter are exceeded, resulting in an inverter shut down as part of its safety relay. Once shut down it will take around 10 minutes for the inverter to start up again.

A spike in voltage could last for milliseconds, but cause your PV to shut down for 10 minutes – which can add up over the course of the day. More often than not the issue can be resolved by the local DNO.

What to look out for:

  • Lower than expected yield
  • Inverter flashing and recording ‘0 W’ in daytime
  • ‘Spiky’ monitoring graph, with brief but significant drops in generation between 10am and 3pm.

Topics: Maintenance, Solar PV