CJW8 wrote:
Don says you may not want to bother with MPPT but I disagree. Why throw away 10-15% of your solar production by not going MPPT?
Homeless,
If the controller cannot handle the combined Voc of the two 12v panels in series, but only in parallel, then there is very little voltage (Vmp) for the mppt to work with.
The Tracer BN Series mppt's have a 150v Voc input rating, which easily handles 12v panels in series.
Tracer 30a mppt c/w remote monitorIf there is room, I would go with 24v panels for a rooftop install... for considerably more wattage. You can run them in series during cool cloudy weather, (when Vmp is higher and Imp is lower); and in parallel during hot sunny weather, (when Vmp is lower, but Imp is higher).
12v panels are smaller and lighter, and thus make for a good portable pwm system.
I use these for "fusing" and switching:
high amp audio c.b's
