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Hi Tats,       The makers of folding campers recommend not to use the charging unit only to supply the  12v gear.They say it will overheat the unit which was designed to charge a battery. However I am a bad lad and have never used a battery on my cruiser.I hated lugging the heavy things about ,and the care you have to take maintaining  them ie if you leave them great lengths of time without charging and discharging the plates go down .I have a couple of mains table lamps, instead of the 12v light ,therefore I am only using the water pump which is short duration and all has been fine up to now(famous last words)

  Hope this helps GCB

My dandy has a transformer which is designed to run without a battery, but only up to a certain load. All I have is a 2x8watt light and the water pump. With just the light on it's surprising how hot the transformer gets.

I have to be careful not to put anything in the locker which will cover the transformer otherwise I think it would catch fire.

Cookie2, the fridge runs off 240volt mains if on EHU.

If running on gas with no EHU, there is possibly a very small 12volt feed to the fridge if it has auto ignition.