Hi David
We had a similar battery problem some years ago in Tahiti on our way to Fiji. I disconnected one bank which reduced our capacity but we were able to manage ok with 4 on the boat and extra Onan running.
We use a Chinese balancer I bought through Alibaba, but Vetus make a good one.
Cheers
Alan
Elyse SM437

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Sent from my Android device with K-9 Mail. Please excuse my brevity.