LED driving lights wiring

Submitted: Friday, May 09, 2014 at 19:02
ThreadID: 107697 Views:1599 Replies:3 FollowUps:1
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What size wire do I need with a 120w LED light bar and a pair of 90w LED lights
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Reply By: Robin Miller - Friday, May 09, 2014 at 20:44

Friday, May 09, 2014 at 20:44
Hi Twinkles you are saying you have 120+90+90=300w

Thats a lot of LED power , rule of thumb is no more than 7 amp (84 w @ 12V) per 1 mm sq cross section area of wire. I.E. Minimum of 4mm sq copper in your wire.

I'd reccomend 6mm sq though.

Robin Miller

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AnswerID: 532184

Reply By: cookie1 - Friday, May 09, 2014 at 21:01

Friday, May 09, 2014 at 21:01
I would recommend wiring the Bar & spots seperately as you have a combined load of 25A (300/12=25)

Lightbar 120W / 12 = 10A - 8B&S/AWG
Spots 90W x 2 180W / 12 = 15A - 7B&S/AWG

I would also use 2 relays and remember to fuse each line from the Battery with say a 15A & 20A respectively

cheers
AnswerID: 532187

Reply By: The Bantam - Saturday, May 10, 2014 at 00:00

Saturday, May 10, 2014 at 00:00
The first question should be where are they mounted...that will determine how long the cabling run is....without this information no sensible recommendation of cable size can be made.

Yes I would run them on two seperate circuits,switched by seperate relays and controlled by seperate switches.

BUT we need to know how long the cable runs are.

cheers
AnswerID: 532196

Follow Up By: cookie1 - Saturday, May 10, 2014 at 18:00

Saturday, May 10, 2014 at 18:00
True my mistake sorry,
my estimate was on 5 metres of cabling so if you are mounting them at the rear of your vehicle then you will need to use larger capacity cable

cheers
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