Hi folks. I’m implemeting an Orion DC-DC converter (24/12, 70A) and BMS on a series-parallel lead acid battery system in an RV. While researching how to get this install done, I have read Victron’s Wiring Unlimited publication with great interest and have implemented some changes to the RV battery …

Thanks for your input @ pwfarnell . I did see that info in section 3.5, however it did not sink in with me. I guess there’s a couple reasons for that - I’ve got 2 parallel strings of 4 batteries (whereas section 3.5 shows 3 parallel strings of 2 batteries); I’ve got 2 of the 8 batteries located els…

If the interconnected can handle the full current then I suggest you leave them as normally they see little current. The advantage being that the 22V load is shared better and if you add a balanceruou only need 1. I would also monitor the 22V mid point voltage and consider if you need a balancer.

Thanks for sharing your thoughts. I’ve got a BMV-702 and will be installing it in the coming days. Will look to set up the midpoint monitoring that this BMV is capable of. The interconnect wiring between batteries in series or between batteries in adjacent banks is 1/0 fine strand welding cable. …

Inter-battery connections of Series/Parallel battery banks

DIY

pwfarnell 13 April 2026 18:14 2

See page 19 and 20 of wiring unlimited, Section 3.5.

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Inter-battery connections of Series/Parallel battery banks

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