Published Date 5/24/16 1:40 PM
Installed a MPTT 12v set-up on my boat about 9 months ago, worked well getting 4-8 amps from 2x 120w panels mounted flat on the boat cabin roof.
A week or two ago it started to fail, one of the panels was putting out 1.4v the other full volts so disconnected one panel and the set-up worked for a few days before the other panel failed. It was putting out full voltage but only showing 0.1 amp on the MPTT controller under full sun.
Checked all the wiring, no change, so replaced all the wiring, this did not fix the issue. With all the new wiring I put in a older non MPTT charge controller and went away for the weekend, came back to find the battery’s at the same state of charge.
The “broken panel” was putting out 1.4v in the shade and 9.5v in full sun, the “working panel” 13-20v depending on the sun, but no power was going though to the battery’s.
I removed both panels and installed a old 100w flexible panel, this worked with the old charger and the MPTT charger. It seams both of the 120w panels had failed.
Talking to the the suppler to resolve the issue.