What you will see
- AC V Outrange or Error 300 on the screen or ShinePhone app
- Inverter stops at midday on bright days, or in the evening peak
- Lights flicker or dim at the same time
Why it happens
High midday voltage happens when many houses on one transformer export at once. Low evening voltage happens on overloaded lines.
A long or thin AC cable between the inverter and meter adds to what the inverter sees.
Growatt's advice is to check the grid voltage and, if it is within range and the error stays, contact support.
Diagram
When the grid leaves the window
Midday
Many homes exportVoltage rises
→InverterError 300
Evening peak
Heavy loadVoltage dips
→InverterError 300
A long or thin AC cable adds to what the inverter sees.
What you can check yourself
- Note the time it happens and whether it is sunny-afternoon or evening
- Ask neighbours with solar if their inverters stop at the same time
- Check that the AC breaker for the inverter is fully ON
What not to do
- Do not change the country or grid setting yourself
- Do not keep switching the breaker off and on
When to call us
- Measure voltage at meter and inverter
- Check AC cable size, length and joints
- Confirm the right country setting
- Prepare readings for a FESCO or LESCO complaint
Grid voltage in Faisalabad and Lahore
High midday and low evening voltage are common on busy FESCO and LESCO transformers. Our teams take readings so you can raise it with your DISCO.
Send us
a photo of the screen or app alarm with the time, and the distance from inverter to meter