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ant13 avatar image
ant13 asked

12V batteries (110Ah and 220Ah) in parallel using MPPT 75 / 15

Batteries have different capacity; is it advise to connect them in parallel? or should I use an Argo FET battery isolator?


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drobbly avatar image drobbly commented ·

I'm after the same advice I've just got a new motorhome and want to change the current controller to my victron and charge two batteries the Leisure battery and the starter battery. It currently has a change over switch from one to the other or off.

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offgridsolutions answered ·

Ant13, you could run two batteries of different sizes, but care should be taken as you could find that the smaller older battery could be held at a to higher voltage for to long and damage the battery, so I would not recommend it, also not all 12v batteries have the same charge characteristics.

Drobbly, i definitely would not do this where a starter battery is combined or you would find your self with a flat starter battery, use a battery charge combiner for this situation

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