Series Parallel Battery Options

[rmaddy]

I'm just starting to delve into the world of solar. I have a question about combining batteries.

As an example, let's say I have four 12V 100Ah LiFePO4 batteries and I wish to wire them to make a 24V 200Ah setup.

I see two options:

1 - Wire two in series. Wire the other two in series. Each pair now makes 24V 100Ah. Now connect those two in parallel for 24V 200Ah.

2 - Wire two in parallel. Write the other two in parallel. Each pair now makes 12V 200Ah. Now connect those two in series for 24V 200Ah.

Other than option 1 needing 4 wires and option 2 needing 5 wires, is there any benefit either way to using option 1 or 2?

 

[Giuseppe Hardblast]

Your over thinking this me thinks

 

[Spicoli]

... let's say I have four 12V 100Ah LiFePO4 batteries and I wish to wire them to make a 24V 200Ah setup.

Is this what you are looking for?

Mod edit; please include a description of all links. the above link is a picture of wiring of for 12v batteries to get 24v. it is also not the best way to do it. the controller is not wire optimally.

 

[rmaddy]

Is this what you are looking for?

Thanks but no. I understand how to do the different combinations of wiring, I'm trying to understand which way may be better: 2S2P or 2P2S.

BTW - the wiring in that image isn't ideal from what I've seen. The two wires going to the controller should come from opposite ends of the two serial strings to provide better balance across the batteries.

 

[speedhighway46]

I have four flooded Group 31 6V deep cycle house batteries in my Motorhome. They are wired 2S2P to provide approx 400 amps at 12 VDC. They have worked flawlessly for six or seven years. They are charged from the truck alternator when underway thru a Argofet FET Battery Isolator. They can also be charged via a on board APU, or when shore power is available via a 40 amp built in battery charger. I do not have solar. The batteries are joined with 00 cables, and the run to the distribution panel, approx 15 feet, is 2 gauge cable.

Per your question, I think either option would work equally. P=IxE works the same either way. I guess the way I did it was partially determined by the way the batteries fit into the battery box on the outside of the truck, and the limited space for cable routing.

Just my opinion . . .