My Solar Install
Summary of parts/pieces. Tristar mppt-45 controller 250w Conergy 250p 24v panel 10awg mc4 connector wire from roof to controller, wanted 8awg, but couldn't get them locally and shipping was ludic...
Forum Discussion
AlbertaNewbie wrote:EsoxLucius wrote:
The TS-45-MPPT can accommodate 800 watts NOCT. So three 250 watt panels is possible.
http://www.amsolar.com/home/amr/page_164
Yes, however my single panel is putting out over 16amps, so 3 would put me over the allowable rating of 36amps Isc per the tristar manual. Current rating of the controller must be 125% at or greater than solar arrays short circuit current output (Isc).
I also plugged the panel specs into morningstars string calculator and both in series and parallel with 3 modules it exceeds max solar input.
Put the added panels in series and your Isc does not increase.
Four panels would need to be series/parallel and power to the battery would be clipped at 45 amps. MS MPPT is designed to operate all day at 45amp rating. The string calculator is a bit conservative with wattage. Primary issue to avoid is max Voc.
Morningstar MPPT Controller's Maximum Input Power Rating
I can't imagine you would need more than two panels so mostly this is just theory talk.
