Large Battery Bank

DIY
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1

Hi All,

Looking for guidance as I increase my battery bank capacity at the off-grid camp.

At present, I have 3x 170Ah Victron Super Cycle AGM batteries in parallel (diagonal wiring), and I plan to add three additional, identical batteries.

Victron does not seem to indicate if there is a maximum number of AGM batteries in parallel, and my concern is imbalanced loads/charging. All wires (4/0) are of equal length in between the current three batteries. As I see it, there are three options for which I am looking for feedback:

  1. Connect three additional batteries to the existing parallel string, maintaining diagonal wiring.
  2. Create a new, 3x battery parallel string, and connect this via Lynx Power-In, staying parallel with the original bank.
  3. Divide batteries into three groups of two, connecting each two-battery parallel string into the Power-In bus bar, all ultimately in parallel to maintain 12v output (I’m thinking this would ensure most consistency in battery load/charging).

**Note that regardless of the option chosen, all cables will be the same gauge and length.

Appreciate the feedback!

2

About half way trough the battery bank chapter you see four examples.

If you are thinking about going from 12V 510Ah to 12V 1020Ah then i think its worth also worth thinking about switching to 48V if you are in the business for that kind of capacity

3

I agree with the recommendation for 48v…just trying to avoid that as to not have to replace the Multiplus 12/3000/120.

4

If the MP is the only thing that would need changing, then thats manageable

To your initial question, i like the fourth option, to me its the simplest to use and wire up

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