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If you have any form of lithium on a BMS, it should control the charge for you and turn off the current as soon as any one cell hits max voltage. Meaning you don't need a charge controller.
If you're not going lithium, you could use 3 separate solar panels with 3 separate, small 12v solar charge controllers -- one going to each battery. But it will be up to YOU to make sure they stay balanced. (by letting them all charge up fully via solar now and then would be the easy way)
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