LifePO4 batteries are fairly new for solar use. My home originally used a 24volt bank of lead acid (see pic on the right). These failed only after a year of use. This was a costly mistake.My replacement bank is LifePO4 25.6volt batteries as in the left photo. These I bought off Amazon for 241usd each.Each battery has built in BMS for under/over voltage protection, cell balancing and temperature safe guard. LifePO4 (and any lithium secondary cell) requires 2 stage constant current and constant voltage charging. In my arrangement, a float voltage was allowed since load is always drawn by an inverter.LifePO4 does not explode or catch fire like lithium cobalt (found in cell phones and laptops etc). It does not have toxic chemicals and offers four times the power density at a third of the volume compared to lead acid. For these reasons I felt safe to have such batteries in my Home.
Also the lifePO4 chemistry prefers partial charge and partial discharge. You will have no danger of undercharging these batteries compared to lead acid which will sulphate if undercharged.If you are serious about solar powering your home, definitely go with lifePO4. Also make your lighting led and use inverter type air conditioners. Be energy efficient and your cost will be much lower.