L322 Coolbox power cut off

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youmitegetian

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Location
evesham
So in the pursuit of keeping drinks cold I’ve bought a coolbox from Halfords, does the job well, it says it will keep things 15 degrees below ambient temperature which is ideal, and does work very well.
I used it yesterday to keep drinks cool at a party in a field with no electric supply, luckily I thought I’d take my heavy duty jump pack with a 12v socket to run it off in case it flattened the car battery, well it would of for sure as it flattened the power pack in around 10 hours,
Im thinking if I had some sort of a cut off to cut the power to it if the voltage dropped to low then I could just leave it connected to the 12v socket in the boot,
I’ve had a google but didn’t come up with anything,
Any ideas where/if this sort of thing is available?
I have thought about a leisure battery and split charge system but that seems like a complicated expensive solution
 
So in the pursuit of keeping drinks cold I’ve bought a coolbox from Halfords, does the job well, it says it will keep things 15 degrees below ambient temperature which is ideal, and does work very well.
I used it yesterday to keep drinks cool at a party in a field with no electric supply, luckily I thought I’d take my heavy duty jump pack with a 12v socket to run it off in case it flattened the car battery, well it would of for sure as it flattened the power pack in around 10 hours,
Im thinking if I had some sort of a cut off to cut the power to it if the voltage dropped to low then I could just leave it connected to the 12v socket in the boot,
I’ve had a google but didn’t come up with anything,
Any ideas where/if this sort of thing is available?

I have thought about a leisure battery and split charge system but that seems like a complicated expensive solution
You can find such devices on Ebay. However the cut of point is too low as the car would not start after cut off.
The easiest way is a timer module to allow for example 2 hours running.
A split charging system is the only really safe way to go.
 
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Ah ok I did wonder at what point the voltage would cut off, any idea if a split charge or similar could be fitted to the rear fuse box? I did see someone had put a second battery underneath the fuse box to assist with starting
 
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