I bought 12 used sunpower 435w solar panels from the seller about a year ago. I checked panels on delivery 2 showed some burn damage which the seller refunded promptly. I had checked the voltage at the time and all were within limit of the panel specs. A few weeks ago I decided to test the panels with the inverter and unfortunately 5 out of the remaining 10 show voltage on connection to inverter but no current so the output power is zero.
After much reading I attempted replacing the bypass diodes but no change. The original diodes test fine with multimeter.
Any ideas on how to diagnose the issue and make it usable.
After much reading I attempted replacing the bypass diodes but no change. The original diodes test fine with multimeter.
Any ideas on how to diagnose the issue and make it usable.