Some time ago I got the opportunity to create a powerwall (or more specifically a 'solar generator') for a local scouting group.
They were donated some solar panels but did not have any means to store this solar power and wield at their desired time (mostly during food prep and during night time).
So I started collecting old laptop batteries and e-bike batteries.
Begun the arduous process of dismanteling these, testing them and sorting them.
I eventually ended up creating a 7s22p battery.
Bill Off Material:
154 18650 batteries
DC socket (12V and 5V)
Reason for the metal enclosure
The true nature of the this powerwall is rather to be a solar generator to be taken along during a scouting camp. So I still needed to keep it somewhat mobile but safe to use and most importantly protect the users in case something does go wrong with this DIY setup.