Sungrow Grid Overvoltage | Faisalabad, Lahore

Sungrow inverter shows Grid Overvoltage (code 2, 3, 14 or 15)

Short answer

Codes 2, 3, 14 and 15 mean the Sungrow inverter saw the grid voltage go higher than its protection limit and disconnected to protect itself and your wiring. It normally reconnects on its own once the grid comes back to normal. If it happens every sunny afternoon, the cause is usually a high local grid voltage or a long, thin AC cable, not a faulty inverter.

What you will see

Inverter stops for a few minutes around midday, then starts again
iSolarCloud shows Grid Overvoltage with code 2, 3, 14 or 15
Generation curve has gaps on bright days, worse on Sundays and holidays when the area uses less power

Why it happens

Every inverter has to stop exporting when the grid voltage is too high. In many Faisalabad and Lahore streets the transformer voltage is already high, and when several houses export at once it rises further.

A long or undersized AC cable between the inverter and the meter adds to the voltage the inverter sees, so it can trip even when the voltage at the meter looks fine.

Code 14 is the slower 10-minute average check; codes 2, 3 and 15 are quicker or transient checks. All point to the same cause.

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:

231415

A long or thin AC cable adds to the voltage the inverter sees.

Applies to Sungrow SG-RS, SG-RT, SH-RS, SH-RT and SG-CX inverters.

What you can check yourself

Screenshot the fault in iSolarCloud with the time it happened
Note whether it happens at the same time of day and on bright days
Ask neighbours with solar if their inverters also stop at midday
Check that the inverter has not lost its settings after a firmware update (the app shows the country/grid code)

What not to do

Do not ask anyone to raise the protection limits without the DISCO's consent; Sungrow itself requires the power company's approval
Do not keep resetting the AC breaker; the inverter reconnects on its own

When to call us

Measure grid voltage at the meter and at the inverter while it is exporting
Check AC cable size, length and every joint between inverter and meter
Confirm the correct grid code is set for Pakistan
Prepare a FESCO or LESCO complaint with readings if the transformer voltage is high

High grid voltage in Faisalabad and Lahore

Midday overvoltage is common on busy FESCO and LESCO transformers with many solar homes. Our Faisalabad and Lahore teams can take readings and help you prepare a complaint to your DISCO.

Send us

iSolarCloud fault screenshots with times, your inverter model, and the distance from inverter to meter