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The 2 battery proposal should work fine. Would verify that the red tops are actually all series for 72v in the car.
6000w continuous rating so around 8hp, that should be plenty cant image solar car has more than a couple KW motor.
I think there is a decent chance you could do better by diying with some tesla modules or whatever and riging up BMS and charger from comercially available systems.
But for plug and play ease, if those batteries are known to be decent it should work fine.
May want to pay attention to the nominal battery capacity ratings verses in use. I think Lion you can reliably use about 80% long term but not sure if the 50Ah rating for deep cycle is nominal or in use.
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84 930
18 Cayman GTS
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