How is the durability of the battery pack brother?
battery life depends on how it is used, your application, and storage temperature
Backup Only -> Flooded battery -> can use up to 2~4 years DOD 20%
Backup Only -> GEL battery -> can use up to 5 years DOD 50%
Backup + Solar -> Tubular battery -> can use up to 3 ~5 years DOD 50%
Backup + Solar -> LiFePO4 battery -> can use up to 10 years DOD 80%
ex : battery cycles 1000 @80% DOD, 3000 @ 20% DOD
New inverters allow mixing power from grid and solar that will save your battery life
Finally, it all depends on how you want it

