Powerwall killer

I am in the beginnings of negotiations with an electrical engineer to contract to me to write me a simple set of instructions to build my Powerwall killer. It'll use the little bit more expensive LiFePO4 battery technology, with the advantage it's far more stable than 18650 cells. It's a smiliar system to my Mums electric car she built, hers was at 144VDC, mine will be at 48VDC.

I'll keep you all updated. I have some upcoming posts about alternative suppliers of railway wheels and bogie construction...