Sungrow Leakage Current 12 | Faisalabad, Lahore

Sungrow inverter shows Excess Leakage Current (code 12)

Short answer

Code 12 means the Sungrow inverter detected more current leaking to earth than it allows while running. Sungrow notes it can be caused by poor sunlight or a damp environment and usually clears when conditions improve. If it happens in normal weather, the AC or DC cable insulation needs checking.

What you will see

Inverter drops off during humid, cloudy or rainy spells
Code 12 in the fault history
It returns on its own when the weather clears

Why it happens

Damp panels and cables let a little current flow to earth. A small amount is normal; past the limit the inverter disconnects for safety.

Damaged insulation on DC or AC cables increases the leakage even in dry weather.

Diagram

A little leakage is normal, too much is not

01Humid or rainy spell
02Leakage to earth rises
03Code 12, inverter disconnects
04Weather clears, it reconnects

If it happens in dry weather, cable insulation needs testing.

Applies to Sungrow residential and commercial inverters.

What you can check yourself

Match the fault times with weather
Look for visible cable damage from a safe position
Check that earth connections on the panel frames are not visibly broken

What not to do

Do not touch panel frames or cables while the fault is active
Do not remove the earth wire

When to call us

Test AC and DC cable insulation
Check earthing of frames and inverter
Inspect panels for backsheet damage

Humid spells in Punjab

Leakage faults show up across Punjab in the humid weeks of the monsoon. Our Faisalabad and Lahore engineers can test insulation and earthing to see if it is weather or damage.

Send us

fault history screenshots and a short note of the weather at those times