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Old 03-29-2015, 04:07 PM   #1
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What gauge wire do I need?

So I'm going to install an auxillary fuse block in a storage compartment in the trailer for LED lights and anything else down the road. The max amp for the block is 100 amp which I don't plan on coming anywhere close to. What size wire should I run from the battery to the block? I'm guessing it will be somewhere in the vicinity of 40 feet. Should I run wire like this?

Marine Wire 8/2 AWG Gauge Size Flat Duplex 8 AWG 2 Conductor Boat Cable Genuinedealz.com

Trailer is a 2015 SLX 264BHW.
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Old 03-29-2015, 04:27 PM   #2
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What size wire should I run from the battery to the block? I'm guessing it will be somewhere in the vicinity of 40 feet. Should I run wire like this?

You should run both a positive and a negative cable directly from the batteries to the rear storage compartment. I would fuse the Positive cable at both ends of the run. Here are a few charts to help you decide which size wire to use. You will have to make a decision on your MAX AMPS. It is better to go bigger than you think you may need. These are the charts I use.

Don
Attached Thumbnails
AWG 12VDC Max Amps.jpg   AWG - 12VDC.jpg  
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Old 03-29-2015, 05:03 PM   #3
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It really depends on how many amps you intend to draw at that point, but based on your description it doesn't sound like a lot. I would agree with Mustang and fuse both ends, but use a fuse rating that matches the amps you intend to supply through appropriate cable size
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Old 03-29-2015, 05:50 PM   #4
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Originally Posted by Jmooney View Post
...use a fuse rating that matches the amps you intend to supply through appropriate cable size
2x

Don
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Old 03-29-2015, 06:05 PM   #5
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Also consider if it a 40 ft distance one-way it is electrically an 80 ft run.
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Old 03-29-2015, 06:09 PM   #6
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My original thought was running 8AWG because the LED lights draw so little amps I wouldn't need much. I think the LED light strip draws around 72 watts which should be 6 amps. I'm doing that and some LED strips to light the compartments so I'd guess they're the same draw.

I was going to run a 50 amp fuse even though I'd never come close to that draw. All lights are going to be on switches so they'd never all be on at once. Largest inline fuse holder I've seen is 6 AWG up to 60 amps.

But back to wire selection, would you recommend something like the 8/2 wire style? Or run individual positive and negatives?
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Old 03-29-2015, 06:26 PM   #7
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Also consider if it a 40 ft distance one-way it is electrically an 80 ft run.
AWG gauges are calculated for both wires for a specific distance.

Don
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Old 03-29-2015, 06:35 PM   #8
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Coming off the battery now is a 12/2 and 10 awg wire that looks like it feeds the fuse panel now. That is run about halfway down the trailer. If they can run something that small, I should be fine with 8/2 wire to only power up 15 amps max
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Old 03-29-2015, 08:23 PM   #9
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Originally Posted by andrewjsmith View Post
If they can run something that small, I should be fine with 8/2 wire to only power up 15 amps max
The TT's wiring is coming off the battery and going about 15 feet, which is good for 30 amps.

Ok, lets look at the other side of this run. What will the voltage drop for the 12VDC battery for 30 feet of wire? Assuming the battery voltage is at 12VDC.

If you use 30 feet of 8AWG:
Voltage drop: 0.89
Voltage drop percentage: 7.42%
Voltage at the end: 11.11

If you use 30 feet of 6AWG wire:
Voltage drop: 0.56
Voltage drop percentage: 4.67%
Voltage at the end: 11.44

If you use 30 feet of 4AWG wire:
oltage drop: 0.35
Voltage drop percentage: 2.92%
Voltage at the end: 11.65

If you use 30 feet of 1/0 AWG wire:
Voltage drop: 0.14
Voltage drop percentage: 1.17%
Voltage at the end: 11.86

If you use 30 feet of 2/0 AWG wire:
oltage drop: 0.11
Voltage drop percentage: 0.92%
Voltage at the end: 11.89

These of course are calculations and are pretty much estimates, as there are a lot of things that can alter these numbers. Type of lugs, not 100% copper wire....

The decision is yours,

Just my thoughts,

Don
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Old 03-29-2015, 08:30 PM   #10
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Quote:
Originally Posted by Mustang65 View Post
AWG gauges are calculated for both wires for a specific distance.

Don
In my experience AC circuits (120, 240, 480V, etc) are calculated as you suggest.

Low voltage DC circuits (12, 24,48V) are distance X 2.
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