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Hi SpmP,
I've looked into using PSU's for a higher power charger for my 144V Lifepo4 pack in my Geo Metro Ev. The problem most of the server PSU's have is they don't current limit. If you have a depleted pack the PSU will shut down as it tries to put out more Amps than it is rated for. A discharged pack looks somewhat like a dead short at first. The RSP series meanwells for example are constant current limiting, that is they put out their max rated current and that no more, and could be used, but are not cheap.
Good luck with your charger project,
Joe
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