Tape for Flexible Solar Panel on Roof - Fiberglass RV


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Old 12-12-2017, 10:24 AM   #1
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Tape for Flexible Solar Panel on Roof

One of my projects next year is to mount a 100 watt flexible solar panel to the roof of my trailer. I am planning on using tape to secure it. Has anyone used that Flextape stuff advertised on TV? Any other recommendations for tape to use including double-sided? I plan to put the double-sided tape at the 1/4, 1/2 and 3/4 positions on the back of the panel and then use the Flextape or other product to seal around the edges.
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Old 12-12-2017, 10:45 AM   #2
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Jim Bennett installed 4 of the flexible panels on the roof of his new 5.0TA a while back. He used Eternabond tape to secure them. He recently posted that the tape seems to be holding up well. Here's the url on the Escape Forum.

http://www.escapeforum.org/forums/sh...ad.php?t=10273
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Old 12-12-2017, 11:47 AM   #3
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3 M Very High Bond tape has been used by many. But before you start, research gel coat separation using the search feature. As I recall Escape had some issues early on. Bolts are more secure with the obvious hole through the hull down side. I chose not to do a roof install. I bought two panels and hinged them. Folded, they ride nicely against the back wall of the pickup when not in use. Good luck with your project. Raz
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Old 12-12-2017, 03:29 PM   #4
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Quote:
Originally Posted by Raz View Post
3 M Very High Bond tape has been used by many. But before you start, research gel coat separation using the search feature. As I recall Escape had some issues early on. Bolts are more secure with the obvious hole through the hull down side. I chose not to do a roof install. I bought two panels and hinged them. Folded, they ride nicely against the back wall of the pickup when not in use. Good luck with your project. Raz
Escape did have 2 or 3 panels detach from the gelcoat but those were aluminum mounting rails epoxied to the gelcoat, not taped. Secondly, that was on raised rigid panels with frames, where winds exert a considerable amount of force on the mounts.

Since the OP intends to use flexible panels resting directly on the roof, bolts or other mounting hardware are irrelevant, and wind is not a factor.

A high bond waterproof tape (such as the Eternabond roof sealer I mentioned above) should do a good job of adhering such panels. Check out the thread I linked above from the Escape Forum for photos.
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Old 12-12-2017, 03:44 PM   #5
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I have 5 100 watt panels attached to my Airstream with 3m VHB tape. 9000 miles so far and no way to pull them off. I smothered the feet with Sikaflex after the installation.

Caution about the flex panels though. They tend to cup where the cells are and collect dirt. Also will the movement of the panel caused by lift eventually destroy the panel?
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Old 12-12-2017, 03:48 PM   #6
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Caution about the flex panels though. They tend to cup where the cells are and collect dirt. Also will the movement of the panel caused by lift eventually destroy the panel?
Good points about flexible panels. I guess the cupping or lifting depends on the panel.
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Old 12-12-2017, 03:52 PM   #7
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Caution about the flex panels though. They tend to cup where the cells are and collect dirt. Also will the movement of the panel caused by lift eventually destroy the panel?
That's why I was thinking of putting double-sided tape at the 1/4, 1/2 and 3/4 lines if you divide the panel along the long length. That would keep the panel from "flapping". Only 1 foot sections would be subject to being pulled off the roof. I think that would be more than enough support to keep flexing to a minimum.
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Old 12-12-2017, 05:57 PM   #8
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I had two 100 watt semi-flexible Renogy panels VHB taped to the front of our Lil Snoozy, and I tell you that it was almost impossible to remove them 2 years later. I donít know if it was just a bad batch of panels, or if it was the fact that they did not have any airflow under them that caused them to drop from 18.5 volts in the cool morning sun, to just 5 volts when the sun was at itís peak. Renogy gave me a total refund, so I just purchased a conventional aluminum framed 160 watt panel from them and VHB taped it via Renogyís mounting system for fiberglass roofs. Itís been holding up well now for over a year and about 6,000 miles.
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Old 12-12-2017, 06:18 PM   #9
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David, I didn't consider that!

Has anyone else experienced this with the flexible panels?
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Old 12-12-2017, 06:35 PM   #10
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Quote:
Originally Posted by rbryan View Post
Jim Bennett installed 4 of the flexible panels on the roof of his new 5.0TA a while back. He used Eternabond tape to secure them. He recently posted that the tape seems to be holding up well. Here's the url on the Escape Forum.

Solar Installation - Escape Trailer Owners Community
Yep, still holding strong. This reminds me I never posted here about my solar setup.
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Originally Posted by trumpetguy View Post
Caution about the flex panels though. They tend to cup where the cells are and collect dirt. Also will the movement of the panel caused by lift eventually destroy the panel?
The newer type like I used in the link above are not supposed to do that, and show no signs of it near a year later.
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Originally Posted by David B. View Post
I had two 100 watt semi-flexible Renogy panels VHB taped to the front of our Lil Snoozy, and I tell you that it was almost impossible to remove them 2 years later. I donít know if it was just a bad batch of panels, or if it was the fact that they did not have any airflow under them that caused them to drop from 18.5 volts in the cool morning sun, to just 5 volts when the sun was at itís peak. Renogy gave me a total refund, so I just purchased a conventional aluminum framed 160 watt panel from them and VHB taped it via Renogyís mounting system for fiberglass roofs. Itís been holding up well now for over a year and about 6,000 miles.
Dave & Paula
This is why I used the Eternabond tape. Although it holds like crazy, it can be cleaned of with some effort. I have been getting fairly good current off mine, though have not really tested them, and often am in partial shade. I set mine up in pairs in series putting out 36V, and have never had much of a voltage drop, just a current drop.

I never expected them to get anywhere near their full potential, figuring that if I got 50% in good sun I would be happy. I have an 80W portable to supplement if necessary.
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Old 12-12-2017, 08:20 PM   #11
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Since the OP intends to use flexible panels resting directly on the roof, bolts or other mounting hardware are irrelevant, and wind is not a factor.

.
Solar panels are semiconductor devices. When you heat a semiconductor it changes it's electrical characteristics for the worse. Raising the panel allows for good air flow and keeps the panel cool. At that point wind does become a factor and bolts become relevent.
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Old 12-12-2017, 08:24 PM   #12
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Solar panels are semiconductor devices. When you heat a semiconductor it changes it's electrical characteristics for the worse. Raising the panel allows for good air flow and keeps the panel cool. At that point wind does become a factor and bolts become relevent.
Yes, I'm aware of airflow and heating issues, but it's not practical or advisable to raise a flexible panel, even if you devised a mounting system to do so. The wind would make it flap and probably rip it apart. Since they're not rigid, and have no frame to mount a standoff, they're designed to be surface mounted, at least every one I've ever seen. An exception to surface mounting it might be when it's used as a portable panel, but that's not the OP's plan.
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Old 12-13-2017, 04:24 AM   #13
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Yes, I'm aware of airflow and heating issues, but it's not practical or advisable to raise a flexible panel, even if you devised a mounting system to do so. The wind would make it flap and probably rip it apart. Since they're not rigid, and have no frame to mount a standoff, they're designed to be surface mounted, at least every one I've ever seen. An exception to surface mounting it might be when it's used as a portable panel, but that's not the OP's plan.
Panels are designed to operate at 25*C. A typical derating figure is 1/2% reduction in output for every 1 degree increase in temperature. I'm sure you will agree that if the panel doesn't produce the voltage required then the stability of the mount is irrelavent. The op may want to consider that in his plan. Raz
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Old 12-13-2017, 06:16 AM   #14
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I used VHB tape to install a Renogy 100 watt flex panel on my Parkliner about 3 years ago. Still holding fine.
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