solar + batteris
Hi all. I am in proses of installing solar on my FW I planed on installing 2 /150W panels but made mistake when ordering and ordered 2 lots of 2 so have got 4/150W panels, also got 30' of 8AVG cabl...
Forum Discussion
X2 on a minimum of a 45a controller, IF running all 4 panels together.
30' of 8ga /2 = 15' run. In parallel, at 36a, that's a voltage drop of 0.7v, almost 6%... nasty. You will need at least 4ga, and 2ga would be better. But that's all with a pwm controller.
If you wire them in series/parallel, and go 45-60a mppt, 15' at 18a will result in a voltage drop of 0.35v (almost 3%) using your 8ga wire... 6ga would be better.
Another option is to go with two separate systems... either two 30a pwm's with panels in parallel, (resulting in the same numbers as directly above)... or two 30a mppt's with panels in series, (resulting in half the voltage drop). Provided the two controllers are set to the same voltage, they will combine their amperages equally.
How many 6v batteries do you have, and what is their combined total Ah capacity?
30' of 8ga /2 = 15' run. In parallel, at 36a, that's a voltage drop of 0.7v, almost 6%... nasty. You will need at least 4ga, and 2ga would be better. But that's all with a pwm controller.
If you wire them in series/parallel, and go 45-60a mppt, 15' at 18a will result in a voltage drop of 0.35v (almost 3%) using your 8ga wire... 6ga would be better.
Another option is to go with two separate systems... either two 30a pwm's with panels in parallel, (resulting in the same numbers as directly above)... or two 30a mppt's with panels in series, (resulting in half the voltage drop). Provided the two controllers are set to the same voltage, they will combine their amperages equally.
How many 6v batteries do you have, and what is their combined total Ah capacity?
