So I came across a company selling a power station based on solid state batteries:
https://yoshinopower.com/products/b660-solid-state-portable-power-station
That is 602Wh per their claim. The packs are 16.2v, so 3 would be a 48v battery, and 4 would be 72v. Which means 12.5Ahr for 699... of...