AnswerID: 409579 Submitted: Saturday, Mar 20, 2010 at 08:42
Hi. The first thing that I would do is to check the voltage at the terminals at the back of the fridge. Voltage drop can be considerable.
The second question I would ask is has the c'van a built in battery? If it has have you considered wiring
up the fridge to this battery?
What I have done with my 3way is to connect it direct to my batteries in my caravan (150amphr) via appropriate fuses and a relay. This relay is situated between the caravan batteries and the fridge and is closed when the ignition on the car is turned on and the engine running. The activation cables for this relay run via the terminals of a large 7 pin plug. So with my system the fridge runs on 12v only when the car engine is running and by having it wired close to the caravan batteries I am avoiding most of the voltage drop. I have used
8 aswg cable between the batteries and the fridge but the cables from the car to the relay need not be too heavy and should be able to fit in a large 7 pin plug and socket. All cabling is fused both ends.
Before you ask, the caravan batteries are charged from the cars alternator via a relay, in the car, 4 aswg cable and an independent Anderson
plug. Also I have a multi stage built in battery charger in the caravan that charges the batteries when plugged into the mains (240).
You must remember to change over to gas or 240 if you have stopped for any length of time.
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