What you will see
- Inverter will not start after rain or fog
- Error 203 clears by late morning
- Error 203 stays on dry days
Why it happens
Water in a connector or DC breaker, a cracked cable, rodent damage or a damaged panel lowers insulation to earth.
The inverter checks this before every start and will not connect until it is safe.
Diagram
Damp morning, weak insulation
Dry day
Panels and cablesWell insulated
→InverterStarts
After rain or fog
Wet DC breaker or connectorLeaks to earth
→InverterWaits, Error 203
If Error 203 stays on dry days, there is likely damage to find.
What you can check yourself
- Note whether it only happens on wet or foggy days
- From a safe position, check whether the DC breaker box looks wet or open to rain
- Look for cables lying in water or chewed
What not to do
- Do not open the DC breaker box or unplug MC4 connectors
- Do not spray water on cables to test
When to call us
- Insulation test each string
- Check earthing of frames and inverter
- Dry or replace wet breakers and connectors
Monsoon and fog
Isolation faults rise across Punjab in the monsoon and on foggy Lahore and Faisalabad mornings. We test each string to find the wet or damaged part.
Send us
photos of the alarm, weather at the time, and the DC breaker box