My cooler box has it's wires built into the unit but I still have to use a transformer to plug it into the caravan. The cigarette lighter plug goes into the transformer which is then plugged into the caravans
normal socket. It works fine when plugged into the cars socket but then everything is 12v on the car.
Ours has a two core cable which plugs into the box with a 12v cigarette lighter plug on the other end.It also plugs into a transformer for mains use.
It's a Halfords one.
The 12v round cigarette lighter type plugs have a fuse in.( known as male plugs) Of course they are just called 12v outlets now as they don't have cigarette lighters in newer cars!
The connector shown has a 12v socket and clamps to go onto a 12v battery.Caravans and cars usually have 12v round outlets.
Your coolbox should come with a 12v power lead but they are available.
Post last edited on 28/03/2023 10:31:46
Post last edited on 28/03/2023 10:32:50
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I don't know anything about 12 volt cooler boxes as I have never had one but in terms of the cable being fused, if you unscrew the black female socket from the knurled cap (where the cables enter) I think you will find that there is a glass fuse inside. However, if it's used for an appliance such as a cooler box then the fuse may need to be replaced with a higher amp rated fuse but you will need to seek expert advice as to what size fuse you need.
It would power your cool box but you would be liable to end up with a flat battery if left running for an extended period of time. Check the input power of the cool box and the capacity of the battery.
It is always advisable to incorporate an in line fuse for anything connected directly to the battery.
Yes, it's suitable for connecting your cool box to a 12v battery. As previously mentioned, the plug on the cool box lead usually incorporates a suitable fuse, so an additional one shouldn't be necessary. Using the adaptor for any other device may be a different matter though, you would have to check if that device had a suitable fuse in-line.
Somewhat beyond your question, but anticipating your potential usage, and hopefully preventing you discovering the hard way, most electric cooler boxes (assuming it's not a proper compressor type fridge!) are what are known as Thermo-Electric (or Peltier) devices, and draw a constant quiet high current of around 5-8Amps, that will totally kill a typical car or leisure battery stone dead (to damaging levels of discharge!) in a few hours, possibly as little as 1-2 hours! If it's a better quality cooler box, it will have a battery protection device built in to stop it damaging the battery with excessive discharge, BUT often they will not even start to run on an isolated battery (the voltage will not be high enough), or will cut out within perhaps 10-20mins use as the battery voltage drops. These cooler boxes are only intended to be run from 12v systems/batteries that have a charge going into the battery such as in a vehicle with the engine running!
A proper compressor type camping fridge may run for a few days from a battery if usage and environmental conditions are favourable, but are many hundreds of pounds to purchase.
So is everything practically the same as this previous post?
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Quote: Originally posted by adbos1950 on 28/3/2023
I have a 115Ah deep cycle AGM battery so how much running time would I get before the battery reaches 50%
A couple of hours maybe, if the coolbox isn't a compressor type. As has been said, the peltier type are really designed to run off a car battery while a charge is going in when driving, they are not really suitable for running off a battery alone for any length of time.
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Topic: 12v cooler box
via mobile 28/3/2023 at 8:36am
