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Old 06-16-2024, 05:42 PM   #1
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Leaking where solar wires go through penthouse roof

My old Sportsmobile has been getting mold on the penthouse top interior canvas over the past year, so apparently moisture has been getting in.

I took a close look at the roof today, and I see this.

Apparently the solar wires go through the roof and the gap is (was) sealed by some kind of soft rubbery translucent material, that now easily comes apart in my hands.

What is this stuff? Silicone sealer?

What should I seal this hole with? I read that if it was silicone sealer, I can't switch to any other product now, or it won't stick. (Or can I sand all the residue off?)



Thanks for any advice!
-- Geoff

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Old 06-16-2024, 06:32 PM   #2
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Yeah that's not a good way to go. Sealants that "dry" or cure are meant to be used between materials, not on top. You may want to pull the cables out, separate them, and use cable glands. These seal mechanically (no liquid sealant involved) and are usually leak-proof for as long as they are installed.
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Old 06-16-2024, 07:38 PM   #3
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These work very well. Lap sealant on bottom flange plus drill a few holes for screws to hold it down. E-trailer has a one with screw holes:

https://www.etrailer.com/Accessories...hoCl-EQAvD_BwE

Or this one:
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https://www.amazon.com/Link-Solar-We..._source=1&th=1
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Old 06-16-2024, 08:07 PM   #4
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Here are a couple of solar entry devices I use.

Solar Entry Puck from DIYvan.com. This is a very low profile solution.

Another favorite is Scanstrut DS-HD6-BLK Horizontal Double Cable Seal. This not quite as low profile, but does provide easier access if needed.

Here is a picture of the Solar Entry Puck installed on my van.

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Old 06-16-2024, 09:06 PM   #5
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I like that ScanStrut unit!!
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Old 06-16-2024, 11:12 PM   #6
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Thanks everyone for advice on how to do it the right way.

I am usually a big fan of doing it the right way.


But, sadly, my van is on its last legs these days. I'm just trying to get some more local easy camping done this summer.



I don't think I will take the time to take the roof/ceiling apart to access these wires. I think for now I will put another big glob of silicone there (assuming that's what Sportsmobile used 20 years ago when my van was new).
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Old 06-17-2024, 04:44 PM   #7
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You can get marine grade cable glands that do not require pulling wires out or dismantling anything. https://defender.com/en_us/seaview-c...nd-abs-plastic
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Old 06-17-2024, 04:54 PM   #8
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Nice, thanks!!
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Old 06-17-2024, 07:23 PM   #9
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I used glob on mine 5yrs ago. 3M marine 5200 I think ? Still holding. I like these lap/pucks though. Didn't know they exisited? Much nicer and cleaner.
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Old 06-23-2024, 11:40 AM   #10
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I really like Scanstrut. I've used their seals for other things, but just picked up one of their horizontal entry seals for when I redo my solar:

https://www.scanstrut.com/rv/cable-seal/horizontal
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