Running #4 wire thru roof, how can I do? - Fiberglass RV

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Old 03-02-2014, 08:52 AM   #1
Name: steve
Trailer: Born Free Fiberglass
Posts: 51
Running #4 wire thru roof, how can I do?

I am going to install solar panel on the roof.
Whats the best way to penetrate the fiberglass roof.
Two #4 wires.
Thanks.. Stev

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Old 03-02-2014, 09:11 AM   #2
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Name: Carol
Trailer: 22' Airstream Formerly 16' Scamp
British Columbia
Posts: 11,706
Check out marine stores - a marine deck flange for coaxial cable works. There are different ones - have seen in both plastic & metal. A number of people here have used them.

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Old 03-02-2014, 09:16 AM   #3
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Name: Mike & Sara
Trailer: 86 17' Bigfoot
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Stev I like this style box, everyone has there favorite.

I'd place it in a area above a cabinet where you can bring the wires in and conceal to your control panel area.
Use Rtv, seal tight cable grips, hole saws, have fun.
I'm sure all the experts will be on soon so, hold on tight!
First class rv and welcome.
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Old 03-02-2014, 10:02 AM   #4
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Name: Steve
Trailer: Scamp 19
Posts: 170
I ran the wires from my solar panels in through a plastic wire feed-thru that I purcgachesed on Amazon. Since my panels are mounted on feet, the raise them about 1" above the top of the trailer, I was able to mount the feed-thru under a panel so it doesn't stick out. I used 3M 5200 sealer, from Home Depot, to seal the wires. Since I didn't want any more holes in the roof, I mounted the feed-thru using VHB tape and 3M 5200 around the side to make sure that no water got under the feed-thru. I not have over a 1,00 miles towing with the panels, in rain, snow, and the like with no leaks or problems. I do still check the panels and feed-thru before i leave on a trip.
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Old 03-02-2014, 11:26 AM   #5
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Trailer: 2002 19 ft Scamp 19 ft 5th Wheel
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Put masking tape over the fiberglass where you will drill. Make sure it is sealed tight then drill your hole through the tape. It helps to cut down the chipping of the fiberglass.
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Old 03-02-2014, 01:44 PM   #6
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Name: Mike
Trailer: Boler13/trillium4500/buro13
Posts: 547
I put the wires on all my trailers solar panels through the side of the fantastic fan or roof vent never had a problem with leaks
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Old 03-03-2014, 11:06 AM   #7
Name: steve
Trailer: Born Free Fiberglass
Posts: 51
Thanks everybody. Good ideas.
I am trying to keep my wiring length to a minimum and install the Controller as close as I can to Batts.
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Old 03-03-2014, 03:10 PM   #8
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Name: Bob
Trailer: Escape 5.0 TA
W. Mass
Posts: 299
4awg sure seems pretty heavy for the panel to controller wire, you sure about that?
Bob & Deb
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Old 03-05-2014, 09:56 AM   #9
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Name: Peter
Trailer: 2005 19 ft Scamp 19 ft 5th Wheel
Posts: 1,519
4g is, quite frankly, overkill. Most modern panels come with 10 or 12 gauge wires and matching MC4 locking connectors. Stack 170 watts of panels on your roof (which is pretty much the entire roof ridge for a small fiberglass trailer) and your total voltage drop at full rated capacity is only going to be 0.3 volts for a 10 foot wire run of 12g wire. That's pretty nominal.

My advice: stick with the 10g/12g wire solar panel makers use, and spend the money you saved not buying 4g cable on a better charge controller or a larger panel. 4g ain't cheap.

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