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Imax



Member Since: 09 Apr 2018
Location: South West England
Posts: 28

United Kingdom 
Wiring help for 12V battery to sockets?
I am getting a 12V leisure battery wired in soon. As part of this I am also adding a couple of 12V and USB sockets to run a cool box and other things I may need for short trips away e.g. phone charging, iPad etc

Is anyone able to advise what gauge wire I need to run to the 12V and USB sockets? I know it is twin cable I need for the positive and negative.

Below are the power figures for the Waeco CF-26 cool box I am looking for...

Power input
approx. 35 W

Current consumption
0.44 Ah/h at +20 °C ambient temperature, 0.67 Ah/h at +32 °C ambient temperature, both at +5 °C interior temperature
Post #714721 27th Jun 2018 12:01pm
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rallysteve



Member Since: 10 Feb 2014
Location: Cumbria
Posts: 2227

United Kingdom 2002 Defender 110 Td5 DCPU Keswick Green
I suggest a 20A power socket (like a cigarette lighter) with a 20A fuse and 2mm^2 thinwall cable.

Steve 02' 110 TD5 Double Cab Rebuild Thread
Post #714726 27th Jun 2018 12:07pm
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custom90



Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20348

United Kingdom 
As above an the Bluesea sockets are very good. 👍🏻 $W33T $0U7H3RN $UG4R
🇬🇧🏴󠁧󠁢󠁥󠁮󠁧󠁿🏴󠁧󠁢󠁷󠁬󠁳󠁿🏴󠁧󠁢󠁳󠁣󠁴󠁿🇮🇪🇺🇸⛽️🛢️⚙️🧰💪
Post #714727 27th Jun 2018 12:09pm
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Imax



Member Since: 09 Apr 2018
Location: South West England
Posts: 28

United Kingdom 
Thanks for the info - Looks like I might go with recommended 12V sockets you suggested. I did get some others but the Bluesea sockets look good.

Cheers
Post #714768 27th Jun 2018 1:46pm
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 17372

United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
I love the way the current draw is quoted in Amp-hours per hour! That would be Amps, then.
Post #714785 27th Jun 2018 4:14pm
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Ramsay



Member Since: 30 Sep 2015
Location: Moffat, Dumfries & Galloway
Posts: 627

Scotland 1995 Defender 110 300 Tdi CSW Auto Keswick Green
OK I am somewhat confused by the Waeco figures.

If it requires 35 Watts on a nominal 12V dc supply that is 2.91 Amps. Is it then saying it consumes 0.67 A in operation?

Seems a low amount for a fridge cooling to 5 deg. Is the 2.9 Amps the draw when it is freezing to -18 ? 1995 Defender 110 CSW
1971 SIIA Lightweight
Post #714791 27th Jun 2018 4:22pm
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LandRoverAnorak



Member Since: 17 Jul 2011
Location: Surrey
Posts: 11324

United Kingdom 
That's because compressor fridges operate intermittently. The lower figure will be an approximate average. Darren

110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak

"You came in that thing? You're braver than I thought!" - Princess Leia
Post #714794 27th Jun 2018 4:29pm
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8619simon



Member Since: 04 Nov 2016
Location: North Wales
Posts: 247

Wales 1995 Defender 110 300 Tdi CSW Epsom Green
Try this site:

https://www.12voltplanet.co.uk/cable-sizing-selection.html

You can feed in current draw and size of wire and it will give you the voltage drop over distance. Depending how far your sockets are from the battery you may need to go up a size. Always add in a good safety factor on the size of wire. Too many systems are designed with cables sizes too small for the distance and you end up with insufficient voltage / current at the end.
Post #714800 27th Jun 2018 4:56pm
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Imax



Member Since: 09 Apr 2018
Location: South West England
Posts: 28

United Kingdom 
Thank you for the info - I had a chat with a local company who generally do VW conversions and they said the same regarding the wire. Just need to get my Blue Sea sockets order and my cool box to be wired in on the 11 July.

First short trip planned for the weekend after...
Post #715016 28th Jun 2018 3:44pm
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Imax



Member Since: 09 Apr 2018
Location: South West England
Posts: 28

United Kingdom 
Leisure battery installed along with some blue sea sockets - the blue sea sockets are much better than the others I had purchased. Also had to purchase a dedicated 20amp socket for the cool box.
Battery has been installed under the new load area which has worked well and they have been able to use existing access points for cables etc.
Post #718714 20th Jul 2018 11:30am
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