I'm in the process of fitting a solar system to my narrowboat. I have 4 x 100w mono panels and want to connect them through a MPPT Charge controller to my leisure batteries. (12v system)
I have 2 questions:-
1. What size mppt charge controller do I need, 30amp or 40amp? all the 30amp controllers I've seen have a max PV Wattage of 390w so that would suggest I need a 40amp controller, but I've seen places advertising 400/420w packages which come with a 30amp controller.
2. Does anyone have any recommendations for a brand of controller? There seem to be the expensive ones MorningStar, Outback, Soltronic etc and the cheaper Chinese/Taiwanese brands, EP Solar being one that I've noticed. I've also read lots of stories of people buying a Chinese brand only to find it's not an MPPT but a PWM one labelled up as an MPPT.