Originally Posted by StevenMeredith
A typical junction box contains bypass diodes. A 60 cell solar module is created with 3 strings of 20 cells in series. Each string has a bypass diode which can bypass the sting in case of a fault. In some older solar modules used for off grid applications, the diodes were replaceable in case they were damaged. Most modern solar panels
use a potting material to fully encapsulate the diodes, so no user replacable components.
I pryed the sealent encapsulated junction box off the panel and saw only two leads coming off the panel into the box.
If a diode fails, would the failure result in a short across the leads? (Since I am reading 0.000V, there must be a short.)
Since I have only two leads coming out of the panel, what kind of a diode do you suppose is in there?
I am taking the whole thing apart and hoping that I can seal it with sealent once I am done. My guess at this point is that the plastic laminated semi-flexible panel is OK but the junction box is faulty.
Thank you for your help!