Sunforce 39810 80-Watt High-Efficiency Polycrystalline Solar Panel with Sharp Module




2 Responses to “Sunforce 39810 80-Watt High-Efficiency Polycrystalline Solar Panel with Sharp Module”

  1. HMMWV "God, Country, Corps" says:
    129 of 133 people found the following review helpful
    5.0 out of 5 stars
    An excellent bargain for either battery usage or grid tie – great size too, February 4, 2010
    By 
    HMMWV “God, Country, Corps” (santa clara, CA USA) –
    (VINE VOICE)
      
    (TOP 500 REVIEWER)
      

    This review is from: Sunforce 39810 80-Watt High-Efficiency Polycrystalline Solar Panel with Sharp Module (Misc.)

    QUICK UPDATE: Sunforce is selling obsolete Sharp 12% efficient panels no longer in production at 123W/panel, 2 panels to a kit with a junky inverter and charge controller.. See my review at Sunforce 39126 246-Watt High-Efficiency Polycrystalline Solar Power Kit but choose cautiosly as that product is from 2008 and is now obsolete which makes expansion of your system difficult due to the efficiency change.

    —back to the review as it stood originally—

    In evaluating solar panels (and systems of many panels) the typical pricepoint is $5.10/watt in high volume production. If you are finding better pricing than that something is wrong.

    An example may be inefficient panels that use larger panels, causing massive panel size such that it is 4-8 times larger than this panel with the same output.

    Other inefficiencies to watch out for are caused by voltages that are not useful. You could, for example, have a panel that output 500V at 1/10 A for 50W sold for $250 – looks good financially but very few charge controllers go much over 250 volts (and many dont make 250 volts – some are 12 or 48 volt systems). So that panel is not much use

    This panel is in the sweet spot – enough power to be useful (80W/3 is a simple approximation for what useful power you can get with a battery all day long – about 25W or so given inefficiences. So theoretically it could support a 25W load 24×7 with an 8 hour day of sun.

    The last inefficiencies to watch out for are panels that need heavy sun before they produce any output. Some panels produce usable (1-2 amps) output with just ambient scattered light such as a foggy day, while others give near zero output unless the sunlight strikes them head on. This panel design gives output whenever there is light, which is good. More light is always better, but it could be worse.

    So to sum it up – there are no pitfalls here. It passes all the checks for pricing and performance. We load tested a string of 12 of these for a customer to profile their output to help decide if a rotator would help and it showed that very little gain would come from the expense of an automatic rotation system due to the panel’s efficiency at many angles. With 12 panels we produced 1KW for 8 hours with taper up and down on both sides.

    Best of all this can be used in series strings for grid tie systems or with battery maintainers

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  2. Gregory K "Gregory K" says:
    47 of 47 people found the following review helpful
    5.0 out of 5 stars
    Great panel, March 15, 2009
    By 
    Gregory K “Gregory K” (North Bay) –

    Amazon Verified Purchase(What’s this?)
    This review is from: Sunforce 39810 80-Watt High-Efficiency Polycrystalline Solar Panel with Sharp Module (Misc.)

    Took the panel to Death Valley for a few days to charge my trailer battery and while I ran laptop and iPod stereo for hours during the night, it quickly recharged the battery the next morning. Built a solid stand/rack to keep it upright using pvc pipe that’s easy to disassemble, secure and lock. At 80 watts, it’s just one panel where some 65watt units have 3 panels.

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