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Imported caravans often have no battery, they have 240v hookup & a transformer to run the 12v lights & water tap etc. If you want to fit a battery, the cheap way is to disconnect transformer, install battery & second 12s lead, this will mean battery will charge from car while driving, I'm guess price of this would be cost of battery + wiring = £100odd + labour at whatever hourly rate your installer charges say £50/p.h. Including secure mounting of battery this might take 3-4hrs so maybe £300.
The more expensive way would be to fit a new transformer/charger, this would allow battery charging while caravan plugged into ehu & might add another £150.
All this assumes there is somewhere convenient to mount battery which ideally should be vented to outside. A professional installer might insist on this but a diy installation may not bother about venting battery. The way around ventilation(I think)is to install a gel battery(I stand to be corrected on this)but much more expensive.
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Topic: Electrics in caravan
