Forum Discussion
BFL13
Aug 28, 2018Explorer II
pianotuna wrote:
Hi Time2roll,
I sure would not get a controller that was only 30 amps. It means expansion of the system is a "do over". (I think morningstar is excellent).
I get 16-18 amps from my 255w panel aimed at a high sun. I have a 20 amp MPPT with it. You can "over-panel" a little as recommended by Morningstar. So a 30 with two would be over-panelling for sure--if the panels are aimed at a high sun.
We don't know how open the sky is around this spot for what is the best play. With my "twirler" I would want 20 each, but with both panels fixed tilted up South, a 30 would be ok, since it is only over-panelled for a short time mid-day.
With a "twirler" you get a "high sun" longer in the day so you need 40. But if trees cut off the sun for half the day, you can't take advantage. So then tilt the panels up to the open part of the sky (instead of South) and grab what you can with your 30.
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