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Three 12V batteries for 24V


Gerrie
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I have three 120AH gel batteries,  I want to install a small 3KVA 24V inverter with only 2 x 330W pv panels for a house. The only load on inverter will be an alarm system, cctv, wifi and 20W of lights. Thats about 80W max of load. The only reason for solar is the house is un-occupied but I need the security to work 24/7 and Eskom is unfortunately a zero on a contract. 

Can I use the three batteries 2p + 1S or should i just do the standard 2Series for 24V?

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12 hours ago, gooseberry said:

No way to connect 3 12V batteries to give you 24V.

Oh, there is. But no sensible, recommended way. (1P) S (2P) as the original poster suggested is likely to quickly ruin the 1P, and will provide no real advantage over 2S1P (i.e. not use the third module, keep it as a spare).

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Hi, not a good idea. 

You going to get over charged and under charged on the batteries, and then one or two batteries will get damage.

You can try Battery Balancer from Victron but I don't know if they will work in that configuration. 

Edited by Barryv
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2 hours ago, Coulomb said:

not use the third module, keep it as a spare

The only reason i wanted to connect the third battery was to keep it charged and not left standing in storage, but it seems my luck is out unless i get a small 12v charger to just keep it charged on it’s own. 

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