question

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fede-h asked

Can I use the MPPT with a small panel to maintain my gel batteries while not in use for long periods of time?

I have a setup consisting of 2 x 330Wp panels connected to a blue solar 100/50 controller to charge 2 x 190Ah 12 batteries. This setup is for an off-grid cabin that will not get use during many months (6-9). During these months, the 330Wp panels will be disconnected and stored. The question is: Can I use a small 20W (21.5Voc) panel to maintain the batteries topped during these 8-9 months via the MPPT charger?

MPPT ControllersMultiPlus Quattro Inverter Charger
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2 Answers
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launacorp answered ·

2 from this panels in series may be possible, but 1 panel wont work. Think of the Vbatt +5V to start charching. This will happen in this large amount of months not often. So better grep two of this panels in series to reach the Vbatt +5V even on "not perfect days".

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fede-h answered ·

Thank you!

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