What you will see
- After new installation or roof work
- One input shows nothing
Why it happens
Swapped string cables.
Diagram
One string connected the wrong way
Correct
String+ to +, − to −
→InverterUses it
Reversed
StringSwapped
→InverterPV_01_REVERSE
Leave the DC side to an engineer with a meter.
What you can check yourself
- Note which input and recent work
What not to do
- Do not swap DC cables yourself
When to call us
- Make DC safe and correct polarity
After roof work
Our Faisalabad and Lahore engineers correct reversed strings on Fronus systems.
Send us
alarm photo