Thanks for that reply you are correct actually am looking at 3.75 to 4.05 for longevity, never even occured to me where in the volt range the balancing occurs.
Maybe I might be advised having a simple monitor system and taking it offline at intervals and manually balancing.. if i go brand new...
Yes.. delivery is probably 20 grand.
Regarding the BMS, I think a decent 48 volt solar charger with enough panels and a high amp Bms could balance these over night without mega expense, what issues were you thinking of with the potential for spending 800 on a bms?
13s was the thinking, the mttp solar charger would charge it and if I'm honest I didnt consider the BMS would need to be anything more fancy than the one in my ebike, it was 40 quid!!
Much much more research to do before shelling out I think!
Lead acid would be simpler but I like the life span...