I’m a DIYer with electrical engineering background, although technology has moved on quite dramatically since I started my career 30 years ago! I’ve upgraded / updated my American RV using Victron equipment and 4 x Jaguar i-Pace NMC cells. Reportedly 236AH each but I’m working on 150AH usable which at 12kg each is amazing AH/ kg ratio. Happy to share any of my build info to-date.