It's on his website:Did Andy mention where he got the cells from?
LiFePO4 Cells (LFP)
+ some Sodium cells further down… LiFePO4 battery cells (LFP-cells) are now commonly used in solar storage projects as well as in electric vehicles. These cells have a lower voltage of 3.2V t…
off-grid-garage.com
Shenzhen Qishou.