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 Topic: 12v cool box voltage sensing
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17/4/2020 at 1:10pm
Location: London
Outfit: Lunar Cosmos 524
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Quote: Originally posted by Francais on 17/4/2020
Wow beachhuggy, I would find that feature quite annoying, in fact when I had a VW Golf 17 plate, the 12v to the in car sockets would go off when the engine was of, easily fixed though on that car by simply moving the 20amp fuse one slot along in the fuse box, this then provided the 12v in car sockets to be live permanently, it was very handy to be able to do this simple mod, as not only did it allow me have our Waeco CF25 fridge running in the car over night, I was also able to use my Ring RAC700 compressor with the engine of.
My old Citroen C5 had the same option to swap fuse to enable permanent 12v supply, sadly my current Citroen C4GP doesn't seem to have that option, and yes it is bloody infuriating when you only get a few minutes of power before system automatically shuts it off!
It's less of an issue with my Campingaz electric coolbox, because the inbuilt battery protection circuit would turn it off anyway within a few minutes of turning the engine off. It requires about 14v from the supply, and that is only available with the engine running. Electric (Thermoelectric Peltier types) draw quite a high current (5A or more) and quickly drag the battery voltage down as it discharges.
beachhuggy, my Campingaz electric coolbox is quite old and has been superseded by newer models branded Coleman, which don't seem to mention the battery protection feature, but there certainly used to be a number of boxes on the market that had inbuilt battery protection. It's a pretty essential feature (made slightly redundant by modern cars cutting off 12v supply when/soon after engine stopped!) as a uncontrolled coolbox will kill your car battery stone dead in a few hours!
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via mobile 16/4/2020 at 9:45am
