The last thing i ve tried was disconnecting each panel from the array and testing voc and isc using my multimeter.
Solar panels showing max output but no current output.
All mayor power consumer turned off to exclude overload.
Measure the solar panel controller output voltage try to get maximum voltage by angling the panels.
Solar panels are with all 4 green lights on.
Zero power output zero output is a common problem and in nine out of ten cases it is due to a faulty inverter or charge controller.
Hopefully it is less than the solar panel controller output voltage.
Measure the battery voltage.
It may be that you can never get more than 12 13v.
Solar panels have voltage but no current output.
As the pv modules are connected in series one failing pv module will shut down the entire system.
If it is good then check the continuity from the load side mc 4 connector to the input to the controller.
Current output varied from 3 6a for each panel i tried to measure the output in direct sun but that was hard due to time constraints spec is 8 1a.
If it is proceed.
All solar panels deteriorate with age but it should average 0 7 or less per year.
But rather than look at maximum power output it is more useful to look at the number of kilowatt hours produced.
Batteries discharge and reactor is also turned off.
Solar panels show changing maximum output but no current output at all.
Its novembre ow and my brother and me have the same problem.
Every panel s output voltage was close to the the manufacturer s spec of 21 3v.
It s also possible that one solar panel in your pv array failed.
So it is possible that you have one panel that is under performing and dragging down the output of the whole system.