House/solar battery opinions
My current battery space is 20"L x 14"w x 10"H Going solar, and want to packs as much AH in there as I can (reasonably). Currently looking at 250 - 300. Price is not THE deciding factor, unless ...
Forum Discussion
Hi seraphim,
The numbers are not going to work as you hoped.
It is a bit more complicated. On an 18.5 volt panel MPPT is not going to give you nearly the gain you calculated.
You might well get more by going series/parallel on the panels so that input voltage to the mppt is 37 volts.
The PWM calculation is also too high.
The numbers are not going to work as you hoped.
It is a bit more complicated. On an 18.5 volt panel MPPT is not going to give you nearly the gain you calculated.
You might well get more by going series/parallel on the panels so that input voltage to the mppt is 37 volts.
The PWM calculation is also too high.
seraphim wrote:
Let's do a comparison with the the Helios 300 watt 8.2 amps at 36.55 volts and the AM 100 watt 5.42 a,ps at 18.5 volts lets use 12v as the charging voltage for ease of calculations (there, PT, I said it lol).
Helios though an mppt 36.55/12*8.2 = 24.9758 amps
AM through mppt (18.5/12*5.42)*4 = 33.42 amps
AM through PMW 5.42*4= 21.68 amps
Ok. I'm man enough to admit I'm wrong. The AMs will put out more amps through the mppt. I didn't 'calculate' their higher voltage through an mppt - just the PMW.
Theoretically, with the 4 panels in a three hour period, I could generate enough amps to recharge a day's usage of 100 amps. It's going to cost me an additional $500, but...
I concede defeat
