Is this a great deal on LiFePO4 batteries? IDK for sure so please tell me...

[houseofancients]

More than likely, it's the BMS. The cells could be wired in any config you wanted, but these pre-built batteries are using a BMS and most of these import BMS makers aren't set up for Series connections. And yes, you are much better off with 24v system. 48v even better still as the amp draw of your appliances will be cut in half for 24v, etc.

the bms is made by phylontech, so it must be limit specified by renology