So my dad and I are building a new little shed in our garden, and my plan was to put a little solar panel on the roof so i could charge a little pack of 18650's of it. I looked online what a proper method of charging and discharging would be, I found a lithium solar charger working on 12.6v (3s) but i also wanted to balance charge the cells, which the charger doesn't support. So i thought of a bms to balance charge, but i found out that not every bms does that. I currently have 40 cells from laptop batteries, and don't really want to go bigger.I am a bit new to this so could someone help me out?