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Hugo, the old alternator would work but the new batteries should be able to absorb current at about a 50A rate or better. So any alternator that can't supply 50A for extended periods, won't be charging them efficiently.

That means you'd get a better return on your money (probably 1/2 the engine time needed) by putting in a 75A or better alternator, preferably with an external regulator, so the combination would charge efficiently. But at a minimum, I'd increase the alternator size to feed those new batteries.

A good solar panel and charge controller (three stage) would really keep them happy.
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