Solar wasted watts/volts
I am curious what happens to the watts /volts when your system is fully charged and you have no demand? Were does the extra power go?
Forum Discussion
starcraft69 wrote:
Yes i do plan on a MPPT controller and was looking at a bit oversize in panels.
Using Go power calculator we use about 126.7 Amphrs a day in winter running furnace. summer much less. I currently have 2 6v GC batteries = 220 Amphrs. I plan on putting 300-400 watts 24v+ panels of solar and add 2 mor 6v batts
400W flat install won't get you 127 AH in winter.
To reduce the AH draw, get a catalytic heater - just don't tell anybody on this forum ;) ... Another option would be to limit your MW use when on solar.
I would also suggest buying some $15 AH-meter on Ebay and measure your actual use, rather than rely on calculators.
There is Bogart PWM 30A controller that allows over-paneling up to - don't remember, 600W maybe. Normally with 30A PWM you would want to limit panels wattage to ~400W, and with 30A MPPT to ~500W.
One little problem with Bogart - you have to buy their battery monitor as well, or this controller won't work as it should.
