That would depend on the pressure the fridge unit can deliver to the gas tankHow much cut will I get from the Aldi non compressor model with an air tank made from a 13 kg Calor gas tank ?
I have a 12 v fridge compressor that could run off my solar and fill me one tank of air for occasional use.
How thick the steel blank is.
How many times you have to replace the torch consumables when the pressure drops below 45.
Roughly a foot of 3mm steel- maybe.