Angle Aluminium to attach panel

Discussion in 'Solar Power' started by treeman, Nov 2, 2012.

  1. treeman

    treeman Read Only Funster

    Joined:
    Nov 22, 2011
    Messages:
    112
    Likes Received:
    13
    Location:
    poole
    Looking to fix my large solar panel to the roof. I've bought some Sikaflex 512 to attach it with so now looking for some suitable angle metal to make the brackets. I'm wondering if this size aluminium angle will be strong enough -

    3" x 3" x 1/8" - 6082 T6 /HE30 General Engineering Grade Aluminum.


    Need to be sure as the panel weighs 17kg / 37lbs so want it to stay put, thinking of cutting 1m length into 4 x 250mm brackets.


    The other option is 1/4" ally but that's twice as much money - £28 for 1m compared to £15 for the 1/8".



    Any thoughts on the best option or if the prices I've been quoted are reasonable?

     
  2. Wildman

    Wildman Read Only Funster

    Joined:
    May 30, 2008
    Messages:
    15,458
    Likes Received:
    8,598
    Location:
    Ilfracombe, Devon
    I got a 1mtr length from B&Q it was around £12 I think
     
  3. spannermanwigan

    spannermanwigan Read Only Funster

    Joined:
    May 22, 2008
    Messages:
    394
    Likes Received:
    207
    Location:
    wigan, lancs
    The roof you are bonding too(presume aluminium) is thinner than the 3x3x1/8" angle you propose. The lengths 250mm (10") should be adequate to take the load and spread the weight, and the method of attatchment bonding with sikaflex 512
    will afford some level of flexability acting like a rubber mounting.

    regards
    :thumb:Steve
     
  4. pappajohn

    pappajohn Funster Life Member

    Joined:
    Aug 26, 2007
    Messages:
    29,461
    Likes Received:
    16,892
    Location:
    YO11 2BD
    why not just buy proper brackets.

    HERE

    big enough 'footprint' for sticking down.
     
    Last edited: Nov 2, 2012
  5. JJ

    JJ Funster

    Joined:
    May 1, 2008
    Messages:
    14,552
    Likes Received:
    25,683
    Location:
    Quinta Majay, Pinheiro Bordalo, Portugal
    I found angle aluminium far more affordable than the "brackets" on offer and I used bolts as well as Sikaflex.

    Sikaflex is easily strong enough on its own though especially as I know you will clean the surfaces it is going onto really, really well.

    JJ
     
  6. treeman

    treeman Read Only Funster

    Joined:
    Nov 22, 2011
    Messages:
    112
    Likes Received:
    13
    Location:
    poole
    The ridges on the roof of my MH mean the brackets need to attach to the roof under the panel and cannot extend beyond the panel perimeter so most of the purpose made brackets sit outside the edges of the panel - and the ones I've found only state suitable for panels up to 150w (mines 213w) - otherwise I'd go for them, at £19 they are very reasonable.

    I'd also like to attach the panel by it's sides as then at some point I'd like to be able to pivot the panel and angle it up towards the sun should I find myself out in the winter needing more power.

    Is the 20mm gap they mention a advisable gap between panel and roof?
     
    Last edited: Nov 2, 2012
  7. Leftlegger

    Leftlegger Funster

    Joined:
    Sep 29, 2012
    Messages:
    418
    Likes Received:
    400
    Location:
    N.somerset
    I got mine from the local srap merchant,or whatever the PC name is these days,my local one is friendly lets me look through the aluminium and sells it to me by weight.:thumb:
     
  8. tonka

    tonka Funster Life Member

    Joined:
    Jul 2, 2008
    Messages:
    5,329
    Likes Received:
    7,584
    Location:
    Cannock, Staffs or Benidorm, spain
    B&Q. for me as well...
    I bought a piece 3 years ago for £10. made 4 brackets for an 80w panel and just sickaflex down on the roof of my old van.. Held no problems......
    Just managed to get 4 more brackets out of the left over sevtion to do same on my new van this year, so was good value....

    http://www.motorhomefun.co.uk/members/tonka-albums-solar-panel.html
     
    Last edited: Nov 2, 2012
  9. treeman

    treeman Read Only Funster

    Joined:
    Nov 22, 2011
    Messages:
    112
    Likes Received:
    13
    Location:
    poole
    Thanks for the responses, think I'll go for 2" brackets in 1/8" aluminium, should be strong enough in 4 x 250mm lengths and enough area to get a good bond.

    Does the Sikaflex bond best to a very smooth surface or something with a slight key to it? I ask as my 28 year old roof needs a good clean and am wondering whether to try and rub it down with some very fine sandpaper to get a smooth as possible?
     
  10. Wildman

    Wildman Read Only Funster

    Joined:
    May 30, 2008
    Messages:
    15,458
    Likes Received:
    8,598
    Location:
    Ilfracombe, Devon
    always keys better on a rough surface not a smooth one:thumb:
     
  11. treeman

    treeman Read Only Funster

    Joined:
    Nov 22, 2011
    Messages:
    112
    Likes Received:
    13
    Location:
    poole
    That makes sense - so as long as it's super clean then not to worry about the non-smooth surface?

    And is it best to create a 2 to 3mm gap between bracket and roof for Sikaflex to bond best by using some for of spacer?
     
  12. tonka

    tonka Funster Life Member

    Joined:
    Jul 2, 2008
    Messages:
    5,329
    Likes Received:
    7,584
    Location:
    Cannock, Staffs or Benidorm, spain
    I would clean the area where the brackets will sit and then a light sandpaper just to give a bit of rough surface to get a grip on...
     
  13. jhorsf

    jhorsf Read Only Funster

    Joined:
    May 15, 2009
    Messages:
    9,157
    Likes Received:
    8,067
    Location:
    DERBYSHIRE
  14. treeman

    treeman Read Only Funster

    Joined:
    Nov 22, 2011
    Messages:
    112
    Likes Received:
    13
    Location:
    poole

    Thanks jhorsf, that article was where I got most of my ideas from, well written and some good pics.

    Just need to work out how to make some good spacers, those bolts seem a lot of extra work when I was hoping to just cut some 2mm plastic sticks up to use.
     
Loading...

Share This Page