What you will see
- OV-DC on cold mornings
- After adding panels
Why it happens
Panel voltage rises as temperature falls.
Diagram
Cold mornings raise string voltage
Summer noonSpring morningCold winter morning
Illustration. OV-DC01 / 02: fix by fewer panels in series.
What you can check yourself
- Note which input and recent panel changes
What not to do
- Do not add panels yourself
When to call us
- Check string design for winter
- Re-string with fewer panels
Winter mornings
Clear winter mornings in Punjab push string voltage up. We check Solis strings for winter.
Send us
alarm photo, panel model and panels per string