Search the web for anderson connector. Search parallel vs aeries panel connections and pwm vs mppt controllers. I would search solar panel sizes that will later fit on your roof. Get an idea of what sizes are available then cut out some cardboard and see what will fit on your roof. You want to try and not have the panels shaded by placing them too close to the ac unit etc but at times depending on how you are able to park some shading can occur. Try to work around that. It will save you from gathering a collection of parts if you can later move everything to the roof.