Flexable Panels

Discussion in 'Solar Power' started by wizzer59, Jul 6, 2014.

  1. wizzer59

    wizzer59 Funster

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    Ok guys I'm sure this has been asked before, but the boating guys are using flexy panels stuck flat to the deck, if its good enough for them why are we still using rigid with a gap??
     
  2. tonka

    tonka Funster Life Member

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    Price I guess....
    £80 for 80watts off ebay is where I am at... (y)

    ACTUALLY.... Your right... Just looked on ebay and prices seem to have dropped a lot.. 100w semi flexy £125.... Interesting...

    Now can someone explain how the panel cools ? Because I was always led to understand you needed air flow under current solid panels to keep them cool.
     
  3. pappajohn

    pappajohn Funster Life Member

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    My understanding also.
    Panels do get very hot and i beleive the hotter they get, the less efficient they become.
     
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  4. hilldweller

    hilldweller Funster Life Member

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    On top of that it's like painting your roof black, will that heat effect the roof or your comfort ?

    On the other hand, with the gap, your roof is sheltered from the sun.
     
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  5. wizzer59

    wizzer59 Funster

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    So we don't know then, heat on the roof, not sure that's a real problem I'm sure there must be a membrane we can use, losing efficiency, again don't seem to worry the boats?
     
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  6. cmcardle75

    cmcardle75 Read Only Funster

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    Who said we are? I've got 2 flexible panels on my roof. They work very well, are much easier to fit, invisible unless seen from above and more aerodynamic.
     
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  7. wizzer59

    wizzer59 Funster

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    Fantastic just what I wanted someone who has them, as you say much more aerodynamic which is the main advantage from my point of view, what do you think of the other comments?
     
  8. cmcardle75

    cmcardle75 Read Only Funster

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    I'm sure they drop a few % in the heat if people say they do. However, who cares? If it is hot, it is probably also sunny and producing far more power than you need. You actually want it at its most efficient in cold, cloudy weather in the shoulder season with short days, when you need lighting and entertainment for longer and lots of power for the heating fans.
     
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  9. cmcardle75

    cmcardle75 Read Only Funster

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    Actually, the price difference is even less, as a rigid panel needs lots of expensive mounting hardware, whilst a flexi can just be screwed or glued down.
     
  10. wizzer59

    wizzer59 Funster

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    Did you fit yours?
     
  11. cmcardle75

    cmcardle75 Read Only Funster

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    Yes. I used screws and a little sikaflex for sealing. My roof is aluminium. It took all of about two and a half minutes to physically attach them to the roof. Wiring up took about an hour, but required a new cable from the battery compartment all the way to the rear. It also took me half an hour to remove an old empty awning box that was in the way and mounted with rusted screws. I've got room for another 3x100W flexibles above the luton, but can't really justify it as I've never run out of juice since they were fitted and have now even fitted a B2B charger. For the last year, I had solar charging only (no split charge or mains charger) and never saw it below 12.2V.
     
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  12. scotjimland

    scotjimland Funster Life Member

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  13. wizzer59

    wizzer59 Funster

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    Anyone else got anything to add??
     
  14. eddievanbitz

    eddievanbitz Trader - Funster

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    All of your answers are in Jins link. Boats don't go as fast as Motorhomes, there less of a trip hazard on a boat and get font last as long.

    Eddie
     
  15. octopush

    octopush Read Only Funster

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  16. eddievanbitz

    eddievanbitz Trader - Funster

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    Another thing to bear in mind apart from the shortened life, is removal. We regularly remove panels: Either for relocation due to additions to the roof, say in the case of Satellite TV or Air Con being added. Also we often remove panels as customers are selling their motorhomes and want to save the capital cost and have them transferred, and of course a certain amount of panels are replaced as they have been damaged, or have developed a fault.

    If a flexible panel is stuck to the roof, so it was ridgid, it would be impossible to remove and if it was stuck around the edges, the flex would cause undue stress at motorway speeds.

    I could understand if they were much cheaper or much better, but as they're not I fail to see the benefit

    Eddie
     
  17. octopush

    octopush Read Only Funster

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    One big benefit is weight as we are always looking to save on our payload.

    If there is a problem with it and it goes wrong Just stick one on top.

    Another benefit Is cost it is so easy to do it your self saving hundreds on fitting.

    But it all depends on your own finances If fitted by a professional it all guaranteed.
     
  18. eddievanbitz

    eddievanbitz Trader - Funster

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    Sticking either on the roof isn't any different.

    I don't know any companies that are charging "hundreds on fitting"

    As you say though each to their one
     
  19. funflair

    funflair Funster Life Member

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    I guess you can walk on or sit on the flexi stuck down ones, small boats need to make the available space multitask.

    I would stick to rigid myself for MH as they are not as permanent as the flexi jobs and can be removed and upgraded as Eddie points out.

    Martin
     
  20. Puddleduck

    Puddleduck Funster

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    I'm quite temped by free standing panels rather than the ones stick to the roof. I know someone here has such a set-up.
     
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