No clue buddy. Last time I did anything with PV was 15 years ago, we used a bank of Rolls Surrette deep cycle's. Batteries were like 2 volts each, more of a cell than a battery, chaining a bunch up to get to 48 volts for an inverter, than taking those series chains and wiring them in parallel to get more run time. Was mega expensive and like you said, 5 years or so you are replacing them. Not fun either.
The only way I would be interested in doing PV thats not grid tied is if the electrical loads were minimal, like a tiny home or something. Definitely not a grow.