One panel has half the voltage output as the other panels

[MountainmanBill]

I have 10 used PowerFree 100 watt panels.
(Pmax) 100w (+0/3%)
(Vmp) 17.8V
(Imp) 5.62A
(Voc) 21.6V
Isc 5.97A

9 of them read roughly 22.0 volts and 6.5 amps when metered individually, on the ground, in full sunlight, on a 20 degree F. day.

One of them reads 11.08 volts but still has the 6.5 amps.

Could this be a result of bad Diodes in the panel's wiring box on the back of the panel? I can find nothing else wrong with the panel albeit I didn't look it over with a magnifying glass.

 

[pollenface]

The diode is there for bypassing purposes during shading when panels are connected together in series. The shaded panel creates resistance and instead of the current trying to pass through a panel of increased resistance, it passes through the diode instead.

I suspect you have a faulty panel.

 

[MountainmanBill]

Is there anything I can do to correct a faulty panel? What would I look for? Or is that just a waste of time?

 

[HRTKD]

Is there anything I can do to correct a faulty panel? What would I look for? Or is that just a waste of time?

There are YouTube videos showing bad diodes. Some people have installed new diodes. If the panels are under warranty - which yours aren't, of course - they should be replaced under warranty.