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I have an 80 watt solar panel and thinking about the cost of gas got me thinking could i run my fridge off the 12volt during the day. The fridge is 120 watts i have 110amp battery.
Any thoughts on the subject would be apreciated.

may help

http://www.ukcampsite.co.uk/forsale/v/SOLAR-PANELS--POWER-INVERTERS/6205

Our last van had a 12v only fridge.(Waeco)  It also had a 60w solar panel built into the roof.

The company claimed that the solar panel would power the fridge, water pump and lights for up to 4 days before we would need to top up the 110Ah battery with an EHU.

However, in practise we never got more than 3 days use being on battery only.

Rune Caster is correct in that my Waeco Fridge was a compressor type fridge.

These are ideal in a house where the fridge is normally in the kitchen and there are usually several brick walls between it and where people are sleeping.

However in a caravan or the like, these units can be right next to where people are sleeping and they can be noisey.

Eventually all caravans/tents will be powered by Fuel Cells and we will have all the 12v power we could possibly want. We will have 12v dishwashers, fridges, freezers, even jucuzzies, but that day is not here yet.

Returning to the original question, Gas is not really all that expensive when you consider that the amount that a 3-way fridge uses is neglible. It is one single flame burner which once the fridge is down to temperature, is turned down to half or even lower.
We have been away for one month so far and our 4.5kl gas cylinder is still more than half full. That is running the fridge and all the cooking.  

Comparing the cost of the gas to that of EHU and pitch prices, well gas is the cheaper option.

Well all interesting stuff thanks, it was not about saving money maybe saving the earth, i have the pannle already and the battery already so there is no extra cost, it was just an idea, oh and interesting that some of you think gas is cheap 6kg £23.00 where i am. i go away every week end to sites with no hook up "camping and caravan DA's" and i find that tha gas lasts 4 weekends. The book of words, instructions say that the Electrolux uses .5 kg of gas in 24hours. 
I relised that my 80 watt was not big enough to totally power the fridge but as it would run from 110 batt i wondered if any one had done it of thought abought doing this. how about a 12volt preheater for the hot water or 12vot kettle ???????? lets save the planet oh and some money.

Thanks, i do have several batts but i usually go to a site for 3 + days without driving the car, i also have a geni. but this is not the idea. I just thought that some one may have run their electrolux fridge from a 12volt batt. and may have some info on this before I try to reinvent the wheel. its another option and one that could have got me out of trouble when iturned up at a site and the spark igniter stoped working on the fridge (not that i knew that at the time). Perhaps some one could tell me how long my 120watt fridge will run for off of a new 110amp batt.   

Quote: Originally posted by The hair on 16/7/2011

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 Perhaps some one could tell me how long my 120watt fridge will run for off of a new 110amp batt.   

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Really the only way you can run a 12v fridge off a 110Ah Battery, topping up that battery with a Solar Panel, is to have a 12v fridge (compressor type) that is specifically designed to do that.

There are ones around but they are expensive.

If your 12v fridge is also a mains or a gas/mains, then the 12v side is purely there to be run by the alternator in the car and was not built to be powered by the caravan battery.