69 year old retired senior, live in Cali next to Yosemite National Park. I am a electronics hobbyist and Mariposa search and rescue volunteer.
have a old 4WD truck with a bunch of old Arco (slightly browned) on the roof for camping or when I spend up to a week trying to find a lost or injured tourist in the forest.
Problem with used solar panel:
I bought a panel about 5' by 3' with 72 cells, no glass damage.
At the junction box on the back are 4 terminals, (relative to the negative
terminal) I can read 12 volts, 24 volts, and 36 volts.
But when I use a amp meter, (with or without a load in series) the meter reads zero. Tried a different meter, same thing.
Measuring across the 3 diodes in the junction box, same thing.
Good looking panel, no visable damage front or back, measurements taken
with panel in full California sun.
I am a electronics hobbyist but the has me stumped.