I had purchased a Victron MPPT 100/50 already for my build. Then stuff happened with my solar panels and I ended up getting LARGER panels than I had planned, for the same price. Now, when I used Will Prowse's formula in his book, it seems my MPPT is not big enough. I am OK with adding a second MPPT if need be and splitting the load, but would like some input on this.
4 solar panels
320W max power at STC
40.1 Open circuit voltage
10.8A short-circuit current
33.7v Optimum Operating voltage
9.5A Optimum operating current
15a Max series fuse size rating
Solar Panel Array Wattage / Battery Bank Voltage = Min Solar Controller Amp Rating
(320x4)= 1280 / 24 = 53.33amps ** over the 50 of the MPPT
So if I series/parallel to make 67.4 volts (but plan for 80.2 short-circuit?). would it be?
(320x2) = 640 / 24 = 36.67amps ** still under the 100/50 MPPT rating (80.2 v / 36.67 amp)
Thanks
Dan (JustDanD)
4 solar panels
320W max power at STC
40.1 Open circuit voltage
10.8A short-circuit current
33.7v Optimum Operating voltage
9.5A Optimum operating current
15a Max series fuse size rating
Solar Panel Array Wattage / Battery Bank Voltage = Min Solar Controller Amp Rating
(320x4)= 1280 / 24 = 53.33amps ** over the 50 of the MPPT
So if I series/parallel to make 67.4 volts (but plan for 80.2 short-circuit?). would it be?
(320x2) = 640 / 24 = 36.67amps ** still under the 100/50 MPPT rating (80.2 v / 36.67 amp)
Thanks
Dan (JustDanD)