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What Ah were the LA battery? divide Ah of LA by 2 + 20%= needed Ah of LifePO4 Are you building the 72v battery pack with individual cells or 12v LiFePO4 batteries? if 12v LiFePO4 batteries make sure they can be put in series many can't some are limited on how many in series. Just a guess but min size would be in the 175- 200 Ah range.
Later floyd
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