Absorption Fridge Running on Solar/Battery/Inverter System

I have a similar set-up (at 400a/h LFP and 660w) and get the temptation but in the vagaries of the real world harvest, not too sure it’ll always pencil out -

In theory something like this: a gallon of propane has about 91,400 BTU’s, while 325w (ac power) at say a more conservative 75% duty cycle (considering local and inverter losses…) would equal 5850w over 24hrs equals 15.6 hrs refer operation per gallon of propane or 78 hrs per 5 gal tank…Just saying…

3 tons