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12v to 240v fridge query
Posted: 17 Jul 2006, 15:19
by Louey
I'm having trouble getting a 3 way fridge (particularly a RM123) and I was wondering if I could get a RM122 2 way fridge and get some sort of gadgetry or thingy to use it on 240v when I have a hook up??
Anyone have any ideas?
Posted: 17 Jul 2006, 15:32
by Ivorblueun
you could wire in 240v a/c to 12 v dc transformer capable of supplying sufficient current, the downside the 12v system does not have a thermostat and a transformer that size will produce a lot of heat and need to be well ventilated
Posted: 17 Jul 2006, 15:36
by Horza
In theory all you need is a 12v transformer with enough ooomph to power the fridge. The other way to do it is to run the fridge from the battery and charge the battery from a zig or decent battery charger.
I have no idea what the implications of the latter method are but most of the caravans I have seen use this for the 12v system.
Posted: 17 Jul 2006, 15:45
by Louey
Just had a search on Maplins (to start with) and found
this. not sure how much amps a RM122 draws.
Wouldn't be happy using this as it has a cigarette lighter connection and they are crap, would want something more permanent.
Posted: 17 Jul 2006, 16:14
by Ivorblueun
you need at least 10amps zig do an auxillary power supply unit that will supply upto 12amp continous but they are quite expensive and even if you run a battery and charger system if you're not putting in what you are taking out the battery will still go flat just take a little longer
Posted: 17 Jul 2006, 16:16
by Louey
apparently you run the 12v via a relay direct from the alternator when the engine is running so hopefully this means you don't have to worry about batteries being run down
Posted: 17 Jul 2006, 16:55
by Ivorblueun
12v via a relay off the van battery is for running the fridge when on the move I thought we were talking about running a gas/12v fridge off 240 mains when pitched up or have I lost the plot.
Posted: 17 Jul 2006, 17:07
by Dan Wood
I've got a switched-mode power supply that can deliver 15A continuously.
It's in a metal enclosure with lots of circular vent holes, designed for fitting inside other equipment. It would go in a cupboard or behind your fridge without too much trouble.
The input is 240V AC with a fitted 13A plug, the output is 13.2V @ 15 A, via some standard 'spade' terminals.
It's brand new, and probably worth at least 25 pounds.
It would be too heavy to post cheaply though. I'm in the Doncaster area.
Posted: 17 Jul 2006, 20:01
by DiscoDave
too heavy to post?? does it weigh more than 25kg??? parcel to go .com
also worth bearing in mind that a tranny of this size will make a lot of noise as well as heat, to combat noise put pollystyrene inder it!!
Posted: 17 Jul 2006, 20:25
by Dan Wood
No audible noise - it has a tiny transformer 'cos it's switched mode. Essentially a big capacitor that gets topped up at high frequency.
I could post it, but I'm not really into all that sort of stuff...
It does come in a cardboard box though, so it would be do-able.
Posted: 17 Jul 2006, 20:58
by Louey
Dan, I shall let you know very soon. I may be getting hold of a 3 way (someone saw this post and PM'd me)
Watch this space
