EG4 › PV strings and input terminals
PV terminal block found melted and charred
fix confirmed
Symptoms
- A PV input terminal-block screw clamp is found brittle/crystalline and the cable pulls out
- A two-strings-affected FlexBOSS21 loses production and the PV input terminal block is found melted and heavily charred
- A two-year-old combiner/junction box on the array wiring is found melted and cracked with signs of water intrusion, though the circuit breaker never tripped
The cause and the fix
Subscribers see the cause, the fixes that worked and who did them, part numbers and recent prices when a part is involved, and the field reports behind this entry.