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I have two 70 watt BP panels, Vmp 32.3v, Voc 45.2, Imp 2.17, Isc 2.63. I would like to use these for maybe a water(well) pump, or to charge batteries for a backup system or to keep the batteries (two) on my RV charged. I am a bit confused about which controller to get. It seems a MPPT would be the best but for just two 70w panels at 32 v. how should I go? thanks
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If you use the 24V panels to keep your 12V RV charged, you will need an MPPT charge controller to convert the higher voltage down to 12V. You can use the Morningstar 15A MPPT controller, the price is pretty reasonable.
To determine if you can use this for your well, you need to determine the height it needs to pump (head) and the flow. Here is a small 24V submersible well pump, scroll down and look at the chart to see how much current is needed.
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which controller...
Thanks Jason for the info. So you are saying that my panels that have Vmp of 32.3v and Voc of 45.2 are actually 24volt panels. Is there graph or a formula that shows 32.2 Vmp is equal to a 24v panel? Maybe just a standard....anyway I will figure my use and then match the controller accordingly. Thanks again...BillComment
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24volt panels, working voltage is around 32v. 12v solar panel is around of 16v. the solar panel's voltage is higher than the batteries in order to charing.
the 70w is generally 12v, you can connect in series to 24v or in parallel remain 12v, maybe a solution for your controller.
another solution, the controller has 12/24v option.....Comment
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controller for two 70watt panels
Thanks Leroy,
Now I know what to get for a controller. I will name it my 'Leroy controller'.
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Haha
'Leroy controller', good idea.
PHOCOS, germany company and has branch all over the world, professional for DC controller, try from its website.
Good luck.Comment
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