4302 SMA — PV String Overcurrent / Reverse Polarity
At a glance
- Severity
- FAULT STOP
- Domain
- SOLAR_SYSTEM
- Reference standard
- IEC 62548
What it means
PV string current above the rated short-circuit value, or reversed polarity.
Probable causes
- Wiring with reversed polarity
- Partial short circuit in the string
- Blown string fuse
- Incorrectly sized DC cables
Where to start
Isolate the string. Check cable and module insulation with a megohmmeter.
Full guided diagnosis in the app
The diagnostic tree for this fault has 5 guided steps with measurements, checks and resolutions. You'll find it in ElectraIQ, one of the five IndexOS apps: free, works offline.
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