[QUOTE=simonpickard;1759948]Yeah that's what was worrying me. I want to mix both I guess.
The only other thing I can think of is to tee in the main panels cables
just before they hit the controller. Then attach the spare panel to a connector there so they are fed into the controller also.
Would that cause any issues? All of the panels
are 12v and of similar voltages.
I don't honestly know. It sounds like it may be a better option. I'd bet that may be dependent on the capacity of your controller. Feeding the unregulated output behind the controller doesn't sound good. Why should you need a controller in that case?
I hope someone can tell you, that is not going to convince you they know Ohms law.