Most likely was shipped with a 30% charge, so should be good.
Suggest getting the change parameters for your specific batteries from the manufacturer. Those will be needed to fully set up your MPPT controller.
There is also a group of us specifically for Keystone Solarflex users.
https://facebook.com/groups/1494332544294324/
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 Lee, Edith, Lil' Bit & Cuddles
22 MHC 331RL, Surge Guard 35550, SumoSprings, Kodiak disc brakes, 412Ah Lithium, Gen 3 Goosebox, Sailun 85s
22 Ram 3500 CC DRW 6.7 CTD Herrin Hauler Classic Bed, 45 gal AUX tank
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