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StirCrazy

Kamloops, BC, Canada

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Posted: 08/15/20 02:48pm Link  |  Quote  |  Print  |  Notify Moderator

So I have a 1991 slumber queen with an alumium roof and I am putting a 325 watt panel on it, but the mounting feet wont line up with the rafters. whats the best way to fastent it?

I was thinking of using oak strips to span the rafters and then screw the mounting feet to them, any ideas?

Steve


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Ed_Gee

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Posted: 08/15/20 03:16pm Link  |  Quote  |  Print  |  Notify Moderator

If you have at least 6 mounting feet, then 3M #4950 doublesided tape would work well, as long as you cleaned that aluminum roof contact points properly.


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Posted: 08/15/20 03:17pm Link  |  Quote  |  Print  |  Notify Moderator

VHB tape and/or aluminum angle.


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Posted: 08/15/20 03:26pm Link  |  Quote  |  Print  |  Notify Moderator

I’m for at least eight feet and tape.


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Crabbypatty

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Posted: 08/15/20 05:37pm Link  |  Quote  |  Print  |  Notify Moderator

I bought aluminum angle iron. 6 ft piece and cut into 3-4 inch pieces. Bolted to panels then screwed panels into the roof. I applied a healthy amount of dicor sealant under the mounts then on top once screwed in. Works perfectly no leaks. Im not interested in adjusting panels so they are hard mounted.


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pianotuna

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Posted: 08/15/20 05:43pm Link  |  Quote  |  Print  |  Notify Moderator

Add additional mounts where the rafters are, made from angle aluminum.


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Posted: 08/15/20 09:26pm Link  |  Quote  |  Print  |  Notify Moderator

Move the mounting feet on the panel. It's just an aluminum frame. Drill new holes and move the feet where you need them to be.


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Paradox123

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Posted: 08/16/20 03:46am Link  |  Quote  |  Print  |  Notify Moderator

I used 3M VHB tape on my fiberglass roof about 10 years ago and the solar panel mounts are still tight. I’d highly recommend VHB tape for this application.

tuna fisher

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Posted: 08/16/20 06:34am Link  |  Quote  |  Print  |  Notify Moderator

As everyone else , use 3N VHB tape then cover with Dicor. Make sure to clean with Alcohol first. My panels are rock solid still after 10 years or so. No holes in roof


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StirCrazy

Kamloops, BC, Canada

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Posted: 08/16/20 08:22am Link  |  Quote  |  Print  |  Notify Moderator

tuna fisher wrote:

As everyone else , use 3N VHB tape then cover with Dicor. Make sure to clean with Alcohol first. My panels are rock solid still after 10 years or so. No holes in roof


was your alumium fully bonded to your plywood? my roof is one piece alumium and only 5/16" plywood on the back half. the alumium skin seams to float for the most part so i have the feeling if I mounted it like that it would just lift the alumium skin off the roof.

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