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Old 10-01-2016, 03:51 PM   #1
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Angry Charge controller

I have purchased four 40W solar panels for my RV and I have four 6V golf batteries creating 12v. The panels came with four 7A charge controller. The panels create max 2.3A I am told, so I am thinking I need a 9.2A charge controller! I went on ebay and can get 5A, 10A, 20A, 30A charge controllers. A 10A charge controller can be $12 or $70, so do I just pay $70 because it is more money and therefore better? Do I put 3 panels on one 7A charge controller and 1 panel on a different 7A charge controller and connect both to the 4 golf batteries?

Any thoughts?

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Old 10-01-2016, 04:19 PM   #2
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You would need to be on the equator, at noon, to reach the max output of the panels.

You should be fine with the 7 amp controller.

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Old 10-01-2016, 06:43 PM   #3
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Depending on time year, latitude, and if flat mounted - you will typically see ~50-85% of rated output.
Vince and Susan
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Old 10-02-2016, 08:35 PM   #4
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If you are going to buy something, I strongly recommend looking at an MPPT controller. It will yield significantly better charging rates, particularly in marginal light conditions.

I just made that change, and it really helped by roughly 20%.

Tom & Jan ---- Westwing43
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Old 10-03-2016, 03:50 PM   #5
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Panels should be rated about 20% more watts than the controller can accept because you are not going to get 40 watts from a 40 watt panel. Actually, your whole system seems really small.

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