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We've discussed this before on here. Some (most/all?) of the 240v-12v converters struggle with the startup current on a water pump and blow the fuse.

The converters typically have a lighter type socket on them, so you'd have to make up a cable with a lighter plug at one end I guess and either wire it permanently to the water pump switch or run it outside and put a 12S socket on the end.

If your TT has somewhere for a battery it might be easier to get one!

Glen

Hi

I converted the supply to a Camplet Concorde and used a 240/12v transformer. I soldered wires to the + and - ends of the battery box and attached a lighter plug at the other end. I had no problems with fuses going but if you did it is possible to buy this size of fuse in higher ampages which would be able to take higher currents safely.