Ok, I will try to go ahead with the Kelly Controller installment, it can be an fun project.
Using VW E-UP lithium-Ion cells at 25AH each, my plan is to do an 21S2P setup.
At 4,1V pr cell at full charge, that gives me 86,1V and 50AH. (3,888 KWH nominel)
For now i will deal with an BMS later...