I have 360 watts of panels, Zamp 30 amp controller, and it works fine for me. I am careful to try getting the best solar exposure I can, don't waste power, and enjoy what you get. I'm not in Canada, so that can make a difference too though. I only have two 6 volt batteries though, I would like to up that but my 30 foot trailer runs out of room for all the toys.
Mike