Solar panel mounts

Discussion in 'Solar Power' started by stevec, Jul 22, 2014.

  1. stevec

    stevec Funster

    Joined:
    Sep 24, 2013
    Messages:
    609
    Likes Received:
    204
    Location:
    Norwich
    I've put the mounts on my solar panel and have just put it on the roof of the MH (not stuck). I notice that the mounts do not all sit flush with the roof (i.e the bases are not parallel to the roof). Does this matter, as long as I get a minimum of 2mm clearance with a spacer where the mounts touch the roof. I should think the amount of "gap" I have is about 2 to 3 mm max. I'm using Sikaflex 521.
     
  2. funflair

    funflair Funster Life Member

    Joined:
    Dec 11, 2013
    Messages:
    4,493
    Likes Received:
    4,754
    Location:
    Guisborough
    Hi Steve

    Sounds like you will be OK with that, make sure all the surfaces are clean dry and polish free give the plastic feet a good scuff up and then just make sure that you have that bit of a gap to give some adhesive thickness.
     
  3. peterc10

    peterc10 Funster

    Joined:
    Jul 5, 2013
    Messages:
    3,211
    Likes Received:
    2,290
    Location:
    Tunbridge Wells
    I used small stick on plastic protector pads (you can buy big sheets of different sizes for a £1) to act as spacers. Stuck one on the bottom of each mount and applied mastic all around them.
     
  4. SomeoneElse

    SomeoneElse Funster

    Joined:
    Apr 22, 2013
    Messages:
    572
    Likes Received:
    375
    Location:
    Cotswolds
    When I fitted mine, I had six mounts per panel, The centre mount at the front was 2mm proud of the roof. I adjusted the fixing of the mount to the panel to account for this, before fixing the mounts to the roof with adhesive.
     
  5. peterc10

    peterc10 Funster

    Joined:
    Jul 5, 2013
    Messages:
    3,211
    Likes Received:
    2,290
    Location:
    Tunbridge Wells
    Do you mean Sika 512? After you have roughened up both surfaces I suggest you use Sika Activator on them to clean and help with bonding.
     
  6. stevec

    stevec Funster

    Joined:
    Sep 24, 2013
    Messages:
    609
    Likes Received:
    204
    Location:
    Norwich
    I don't have the option to adjust the panel mounts. They are where they are! especially the corner ones.

    I'm using Sikaflex 521 UV. It was part of the installation kit I was supplied with. There appear to be many Sikaflex types used. 521 is classed as an adhesive sealant.

    I've been looking for recommended spacer thicknesses but the Sikaflex documentation does not mention any. I've heard of anything between 2mm and 5mm.
     
  7. SomeoneElse

    SomeoneElse Funster

    Joined:
    Apr 22, 2013
    Messages:
    572
    Likes Received:
    375
    Location:
    Cotswolds
    I asked technical@uk.sika.com for the best Sika product to attach ABS plastic to painted GRP and they recommend Sikaflex 252
     
  8. peterc10

    peterc10 Funster

    Joined:
    Jul 5, 2013
    Messages:
    3,211
    Likes Received:
    2,290
    Location:
    Tunbridge Wells
    Sika 512 is an adhesive sealant that is specifically formulated for the building and repairing of caravans and motorhomes. It is bloody expensive! About £15 if you buy it from a dealer, but you can get it for about £11 on line.
     
  9. stevec

    stevec Funster

    Joined:
    Sep 24, 2013
    Messages:
    609
    Likes Received:
    204
    Location:
    Norwich
    Well, it's on now ...for good or bad! I could have put a bit more Sikaflex on but it did bulge out at most of the edges and I don't think there was much more left in the tube anyway. Where there appeared to be gaps I injected some more with a narrow nozzle. Most of the Sikaflex is 2 or 3 or 4mm. Only in one place did it get less than that. But once you start there's really no going back!

    I found two things really useful. One of those plastic scrapers for removing beads of silicon, or it might be to shape it...not sure. Mine was in a set of three with different profiles. I used it to remove the squeezed out Sikaflex. It did it neatly and without mess. The second useful thing was a sympathetic wife to sooth my temper when things didn't look as if they were going right!

    Now to finish the wiring. Controller and fusebox already installed. Just got to get the cables to the battery in as unobtrusive a way as possible.
     
    • Like Like x 1
Loading...

Share This Page