Rooftop Solar Panel Adhesive

 
 
 
 
 
 
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Rooftop Solar Panel Adhesive

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Posted: 27.07.2020  ·  #1
Just about to take the plunge and order a 130 watt rooftop solar panel. It'll be supplied with four 'plastic' type corner mounting brackets, and from what I've read so far, Silkaflex 292 is the best fixing option.
It's a big panel, and I'm obviously concerned about safety when on the move.
So advice appreciated...is this adhesive, correctly applied to four corner brackets, strong enough to hold the panel securely? I'm considering perhaps extra aluminum angle strips along two sides side, and/or a safety cable of some kind in case of adhesive failure.
All comments and suggestions appreciated.


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Re: Rooftop Solar Panel Adhesive

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Posted: 27.07.2020  ·  #2
I always stick them on, sikaflex is great but I find Soudal RV61 just as good but a lot easier worked with. The four corners had always been enough for me.

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Re: Rooftop Solar Panel Adhesive

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Posted: 27.07.2020  ·  #3
Quote by tony glenn

Just about to take the plunge and order a 130 watt rooftop solar panel. It'll be supplied with four 'plastic' type corner mounting brackets, and from what I've read so far, Silkaflex 292 is the best fixing option.
It's a big panel, and I'm obviously concerned about safety when on the move.
So advice appreciated...is this adhesive, correctly applied to four corner brackets, strong enough to hold the panel securely? I'm considering perhaps extra aluminum angle strips along two sides side, and/or a safety cable of some kind in case of adhesive failure.
All comments and suggestions appreciated.


Lot's of great adhesive's to choose from so it's a personal choice but I went for Sikaflex 252, It's what Sikaflex recommend for mounting Solar panel's.

https://sikaflexit.wordpress.c…r-caravan/


Because I have a very large panel I have 4 corner brackets, 2 middle brackets on the 2 smaller sides of panel and 2 very long brackets on the front side that gets the wind. To get extra adhesion I drilled little holes in the brackets to allow the adhesive to get good and stuck! Also give the roof a good rub of rough sandpaper where the brackets will be situated. Best of luck with the job whichever way you.....Post pics if you can to help fellow craicers thinking of doing the same :up:

 


 


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Re: Rooftop Solar Panel Adhesive

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Posted: 27.07.2020  ·  #4
If bonding without screws make sure your motorhome doesn't have a hail protection roof.
Some continental motorhomes, Rapido for example, have a floating 1mm outer skin designed to absorb the impact of hail and is not bonded to the main roof itself.
Bonding to such a roof without screws means you are relying on a 1mm thickness of fibreglass sheet to hold the panel in place.


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Re: Rooftop Solar Panel Adhesive

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Posted: 27.07.2020  ·  #5
baugette, that's an interesting point about the double roof. I know it sounds weird that I have stuck my head out a roof vent and looked at the roof in windy weather. But I have noticed the roof ripples with the wind

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Re: Rooftop Solar Panel Adhesive

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Posted: 27.07.2020  ·  #6
When I looked at fitting my panel, I had the corner brackets and the Sikaflex ready to do the job. The problem was the roof was not flat by design, being a Movano. There were a series of parallel troughs and ridges about 4" wide. No matter what way I positioned the dish and corner brackets to find the best spot, a significant portion of some of the brackets did not make contact with the roof. So as a backup I made up 4 aluminium corner brackets which I drill-screwed to the four panels sides and stuck to the roof with 3M VHB tape. This tape is very sticky, you get one chance to position it right.

In hindsight, I think it was overkill using the two systems. I think either one alone would have done the job. Even just applying the Sikaflex on the corner brackets, some of which did not make much contact with a surface, the panel already felt really stuck, and the adhesive hadn't even begun to dry. I struggled to even readjust the position. And that was prior to adding the aluminium brackets.


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Re: Rooftop Solar Panel Adhesive

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Posted: 27.07.2020  ·  #7
Many thanks for all the replies, plenty of info to digest. I'll be ordering the panel this week, and will post my progress.

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Re: Rooftop Solar Panel Adhesive

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Posted: 27.07.2020  ·  #8
I was restricted on space on my roof, got an AC unit in the middle, 3 rooflights, roof bars and the front end is barrel vaulted over the overcab bed. I was struggling to find a position that wouldn't be prone to the partial shadow of other rooftop 'furniture'.

I decided to fit them to the roof bars, put some rivnuts through the frames of the panels, cut some aluminium channel for the retaining bars and some stainless steel bolts to hold it all together. May be an alternative option if you have roof bars.


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Re: Rooftop Solar Panel Adhesive

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Posted: 27.07.2020  ·  #9
Quote by <BM>

I was restricted on space on my roof, got an AC unit in the middle, 3 rooflights, roof bars and the front end is barrel vaulted over the overcab bed. I was struggling to find a position that wouldn't be prone to the partial shadow of other rooftop 'furniture'.

I decided to fit them to the roof bars, put some rivnuts through the frames of the panels, cut some aluminium channel for the retaining bars and some stainless steel bolts to hold it all together. May be an alternative option if you have roof bars.


That's how I mounted 2x100 panels on my last van.....No adhesive to be seen anywhere :up:

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Re: Rooftop Solar Panel Adhesive

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Posted: 27.07.2020  ·  #10
Any recommendations for panels? After a flexible >100w for my T5?

Thanks


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Re: Rooftop Solar Panel Adhesive

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Posted: 27.07.2020  ·  #11
I’ve no experience of flexible but anything I have read about them has been negative, I’ll leave it with you to check the reviews


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Flexible panels

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Posted: 28.07.2020  ·  #12
My Flexible panel went from 10A to 1 A in 18 months. Now working on rigid.


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Re: Rooftop Solar Panel Adhesive

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Posted: 28.07.2020  ·  #13
My flexible panel wasn't performing well, unfortunately it was on the only area or the roof it could fit and that was prone to water puddling which no doubt didn't help. I've upgraded to two rigid panels.


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Re: Rooftop Solar Panel Adhesive

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Posted: 28.07.2020  ·  #14
Quote by <BM>

I was restricted on space on my roof, got an AC unit in the middle, 3 rooflights, roof bars and the front end is barrel vaulted over the overcab bed. I was struggling to find a position that wouldn't be prone to the partial shadow of other rooftop 'furniture'.

I decided to fit them to the roof bars, put some rivnuts through the frames of the panels, cut some aluminium channel for the retaining bars and some stainless steel bolts to hold it all together. May be an alternative option if you have roof bars.


Me too
 

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