Voltage vs. PWM controller & wire size
Ok, there is a recent thread out there MPPT vs. PWM and some post were a little confusing to me. Instead of hijacking his thread I started a new one. My set up is two 208 watt Sony panels with 28....
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GD, when I was sizing my series 2*245W system, I run the numbers for #10 and #8 - those are common MC4 extensions. Either size was under 1% loss, and the difference btw #10 and #8 was 0.3%. In real life it rarely and only for a short time hits max designed current, so this translates into a whooping 0.2-0.3 AH difference in daily ~160 AH harvest on a perfect day. Or - near zero difference on a cloudy day. Getting #8 MC4 for the sake of those 0.3 AH, pulling a thicker cable to pull through all kind of holes, more difficult to hide... Even with zero losses I would've gained mere 0.5 AH daily, compared to what I have.
I know enough about "conserve" :). My daily use is less than parasitic draws of some other rigs. The thing is - I don't care about 0.5 AH missed on a perfect day, because even on an average day (not the best day) I harvest more than I need.
OP is trying to figure out how to put those free 2*208W to use. IMO, this is typical 2*24 in series, and with that low wattage I would get #10 and call it a day.
Wiring the battery or inverter is a different story.
I know enough about "conserve" :). My daily use is less than parasitic draws of some other rigs. The thing is - I don't care about 0.5 AH missed on a perfect day, because even on an average day (not the best day) I harvest more than I need.
OP is trying to figure out how to put those free 2*208W to use. IMO, this is typical 2*24 in series, and with that low wattage I would get #10 and call it a day.
Wiring the battery or inverter is a different story.
