smkettner wrote:
As long as the wire is there you can put all the watts you like. Depending on actual wire size you will need to increase voltage by putting panels in series and using an MPPT controller.
Yes. When wire is #8 or #10, you have to either install a few 24V panels in series or limit the wattage to ~300W with two 12V panels in parallel. And, like BFL said, God knows where they will end this wire on the controller side. Or - how they will terminate it on the roof - I wouldn't want any rooftop junction box if I'm not going to do high-wattage parallel install.
Most panels have MC4 connectors, they are easy to work with, waterproof, no need to crimp anything.
I would rather have just a pre-installed "conduit" like OP said, with no wire, but this is a wishful thinking.