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I am not sure exactly what configuration they will end up in. I do not think I will need the whole 120 cells for this project. The first pack I will be making is probably going to use about 40 cells. 5S8P is what I am thinking. I'll use a 300W dc-dc converter to charge the lead acid battery at just over what the alternator puts out.
The next step now is figuring out how to charge them. I have my doubts that my power supplies are isolated as Teoman mentioned. So I may have to come up with something else.
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