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Old 04-11-2015, 05:20 PM   #1
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Monocrystalline Solar panel attachment to roof

I've been reading about the attachment of thin film solar panels to the roof with Velcro extreme strips. I have two "hard" panels and was going to screw them into the surface of the roof as many others have. But reading about the capacity of the Velcro strips I'm thinking that a couple of strips, one on the long side of each panel adhering them to the roof, would be ideal. I'd still like to be able to angle them south when boondocking and with the Velcro I could lift one edge and prop it up to 30° and put a block with Velcro attachments on it to hold it up.

Can anyone think of issues where I'm missing something. Being close to the roof its unlikely wind will get under the panels. There isn't a lot of direct wind in the location where they'll be located. Do you think the Velcro would hold the panels down. Would it be extremely difficult to get the panel loosened off to elevate it?

Ideas? Concerns? Thanks so much.
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Old 04-11-2015, 05:53 PM   #2
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Problem with Velcro to roof is they have no air flow underneath which is needed as they can get quite hot. IMO
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Old 04-11-2015, 07:14 PM   #3
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What is the difference between the solid panel having no clearance and the flexible panel with no clearance?
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Old 04-11-2015, 07:33 PM   #4
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I spoke to the rep at Renogy and the RV kit with the solid panels comes with clips that hold the panel to whatever surface you mount it to. I believe this allows for airflow under the panels. I inquired about the bendable panels and the rep said that you could mount them directly to the roof. I mentioned Industrial strength Velcro and the rep said some people use that. I had always thought that solar panels needed airflow in order to not get to hot.


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Old 04-11-2015, 07:38 PM   #5
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Did he say heat would be no issue?


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Old 04-11-2015, 07:41 PM   #6
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You don't say what type of roof you have. I would be concerned that you could damage or pull loose the roof material while trying to remove or move the panels. Rubber roofing can release from the base especially if heated by a panel above it adsorbing heat.
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Old 04-11-2015, 07:46 PM   #7
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On our 2012 "S" when I installed a Renogy 100 watt monocrystaline panel, I found that the roof is not flat - the panel is. I originally planned to put extra mounts on the ends (in addition to those along the sides). When I set the panel with the mounts on the roof, the mounts on one side of the panel didn't touch the roof! I ended up removing the mounts from the ends and "doubling up" the mounts on the sides of the panel.
I suspect a flexible panel would conform to the roof. My rigid single crystalline panel would not. May be an issue with the proposed Velcro mount.
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Old 04-11-2015, 07:52 PM   #8
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That is true. Non flat roof. I was thinking of putting a bit of material along the edges of the panels to raise 1/2 ". Any suggestions on what to attach to the panels underside that would lift them up and still allow the velcro to attach. Jleising. Would 1/2 " be sufficient? Do you ever tilt your panels?
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Old 04-11-2015, 08:00 PM   #9
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Don't remember how much my brackets missed by. I suspect a half inch may be enough - not sure. May depend on location on the roof. You can easily take your panel up, lay it on the roof where you want to mount it, and measure.
I don't ever try to tilt my panel.
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Old 04-11-2015, 08:08 PM   #10
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Quote:
Originally Posted by Sandiegodoug View Post
Did he say heat would be no issue?


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He said that bendable panels didn't need airflow underneath but that seems to contradict everything I've read about solar. Maybe it doesn't "hurt" the panels but the solar power output is reduced because of the heat. The rep also said the MPPT controller is 20% more efficient than the standard charge controller that comes in the RV kit.


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