What you will see
- PV Reverse Connection fault or alarm in iSolarCloud
- Appears right after new installation or roof work
- One string shows no contribution
Why it happens
If the plus and minus cables of a string are swapped at the inverter, it refuses to use that string to avoid damage.
The fault number tells the engineer which input or string to look at.
Diagram
One string connected the wrong way
Correct
String+ to +, − to −
→InverterUses it
Reversed
String+ and − swapped
→InverterRejects it
The code number tells the engineer which string. Leave the DC side to an engineer.
What you can check yourself
- Note the exact code number; it identifies the string
- Note any recent work on panels or wiring
What not to do
- Do not switch off the DC switch or pull connectors while current is flowing; Sungrow warns this must be done only when current has dropped, which needs a meter
- Do not swap cables yourself
When to call us
- Measure string current and wait for safe conditions
- Correct the polarity of the named string
- Check the rest of the strings before restart
After installation work
If you see this after another installer added panels, our Faisalabad and Lahore engineers can correct the string and recheck the whole system.
Send us
the code number, a screenshot, and when the panels were last installed or changed