What you will see
- Inverter stops for a few minutes at midday and starts again
- Event List shows ID001 GridOVP, ID009 or ID010
- Output is held down with ID116 VoltDerating on bright days
Why it happens
When many houses on one transformer export at once, the street voltage rises. The inverter must stop or reduce power when it goes too high.
A long or thin AC cable between the inverter and meter adds to the voltage the inverter sees.
SOFAR only allows the protection points to be changed after approval from the grid operator.
Diagram
Why it stops on bright afternoons
- 01Many homes export at midday
- 02Street voltage rises
- 03Inverter sees it above its limit
- 04Disconnects, waits, reconnects
Codes:
ID001ID009ID010ID116
A long or thin AC cable adds to the voltage the inverter sees.
What you can check yourself
- Open the Event List on the screen or app and note the codes and times
- Note whether it happens on sunny afternoons and holidays
- Ask neighbours with solar whether their inverters stop at the same time
What not to do
- Do not ask anyone to change grid protection points without FESCO or LESCO approval
- Do not keep switching the AC breaker off and on
When to call us
- Measure voltage at the meter and the inverter while exporting
- Check AC cable size, length and joints
- Check the inverter's country/grid standard
- Prepare readings for a DISCO complaint
Midday voltage on busy transformers
High midday voltage is common on FESCO and LESCO transformers with many solar homes. Our Faisalabad and Lahore teams take readings so you can raise it with your DISCO.
Send us
Event List photos with times, your inverter model and the distance from inverter to meter