for the last couple of years I've managed with a 40l engel - got a discount on it as it was a bit dented, a 12 quid smartcom split charger from towsure, and a cheapy leisure battery, cost 30 quid.
not perfect, I let the battery go flat a few too many times and it would only support the fridge for a few hours in the end when not driving, but it didnt owe me much!
Before splashing out on an Engel, I had a succesion of cheapy electric coolboxes - I just found that they killed batteries in no time, only ever made things just less than lukewarm, and always ended up with a stinky soup in the bottom from condensation
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