Hope everybody is doing well.
I have recently picked up some used abound solar ab1-67b panels and two out of four of them have a really low open circuit voltage (4-9v instead of 30-40v). The weather here is currently quite bad but even with this limited sunshine I wouldn't expect such big difference in voltage.
There are no visible cracks, discolorations / disconnected bondwires as far as I can tell, but they are CdTe based panels instead of the more standard silicon versions.
Luckely the seller is a good guy and I can trade them in for tested working ones next week.
But this has me curious what could cause this kind of problem. My google searches always pointed back to shading / visible damage but this does not seem to be the case.
If anyone knows what could be going on, please enlighten me Video underneath for reference.
And please excuse me for any errors, English is not my native language
I have recently picked up some used abound solar ab1-67b panels and two out of four of them have a really low open circuit voltage (4-9v instead of 30-40v). The weather here is currently quite bad but even with this limited sunshine I wouldn't expect such big difference in voltage.
There are no visible cracks, discolorations / disconnected bondwires as far as I can tell, but they are CdTe based panels instead of the more standard silicon versions.
Luckely the seller is a good guy and I can trade them in for tested working ones next week.
But this has me curious what could cause this kind of problem. My google searches always pointed back to shading / visible damage but this does not seem to be the case.
If anyone knows what could be going on, please enlighten me Video underneath for reference.
And please excuse me for any errors, English is not my native language