My panels have a junction box on the under/back side with terminal for both
interconnections and for isolation diodes. If yours doesn't have such a
feature, then you should also look into the need to install your isolation
diodes in your new box.

Read your panel specifications and hook up recomendations to determine if
the panels already have these panel isolation diodes installed. Redundant
diode only tend to drop the output voltage (about half amp per diode).

My thoughts and experiences FWIW.

Steve
s/v Good Intentions