We are upgrading our off grid System. Re Batteries, currently have 12 - 2v, 850 Ah old lead acid and want to go to 24v - 1000Ah LiFePO4. I am intrigued by building my own Battery Bank but using and getting 40 of the 3.2 - 200 Ah in a 8s5p configuration versus 5 - 24v - 200 Ah fully assembled doesn’t seem to make much sense. Difference in price isn’t really that great when amortized over say 20 years. Also seems to be a tighten, neater operation. So, just personal preferences, joy of building issue or are there some good reasons for the “40 route” , including BMS, etc.?Thanks