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Has anyone used their Lifepo4 batteries to also start their on board generator? My assumption would be that the BMSs would need to be rated for a short amount of surge current. Any experience would be helpful.

I have a chance to get a couple old stock Multiplus 12/3000/120. They would be for a RV 5th wheel mobile application. $615 each. I have n0t checked warranty but figured there probably will not be any. Any disadvantage advantage? Opinions appreciated.