multiple battery charging station, ideas needed.

If you already have a charger that will charge them full maybe all you need is maintainers......

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FWIW, For recharging and maintaining my boat batteries and over winter I've been very happy with my Dual Pro two bank charger. I flip a switch and let them run a full day once or twice a week in winter in a 45° garage. I do use it for lead acids as well.
They are not cheap. A pair of three banks can run 1200 or so these days...

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