Solar panel

Discussion in 'The Beginner' started by Diane1969, Oct 6, 2015.

  1. Diane1969

    Diane1969 Funster

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    morning, can anyone tell me if there is a way of finding out how many watts a solar panel is that's already fitted? Probably a very daft question but hey I'm new to all this !
     
  2. ivorantony

    ivorantony Funster

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    some have the figure printed were the wire comes out but I would try and contact the previous owner and get more information,
    solar panels are getting smaller for the same output from the earlier types so measuring will only give you a rough idea,
     
  3. funflair

    funflair Funster Life Member

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    If its written on it will be on the back and you cant see it, measure it and compare to the size and wattage of ones for sale.

    Martin

    oops too slow, but our old and new 80 watts are near enough the same size.
     
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  4. Diane1969

    Diane1969 Funster

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    The only thing we could find was a serial number , but I will check again. I had thought about contacting previous owner too
     
  5. Bacchus

    Bacchus Funster

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    I would be tempted to try and measure it...

    use it to charge a discharged battery, and measure the increase in SoC over a couple of hours on a sunny day and on a cloudy day, you'll get a much better idea of its usefulness than any (often optimistically) quoted output.
     
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  6. RowleyBirkinQC

    RowleyBirkinQC Funster

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  7. Diane1969

    Diane1969 Funster

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  8. Diane1969

    Diane1969 Funster

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    We will do this when we get it, do they need the strong heat from the sun or is it the brightness on a nice day ? Just thinking the time of year
     
  9. Bacchus

    Bacchus Funster

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    PV should depend on "brightness" not "heat" - in theory a bright winter's day should generate the same electricity as a bright summer's day - more in fact because summer days tend to be more hazy.

    Of course most winter's days tend to be grey and overcast in the UK (although the coming winter is forecast to be dry and cold because of the El Nino), but measuring it on a grey day would give you information that is just as, if not more useful than measuring its maximum output. I can pretty much guarantee that it will spend more time working on grey days in the UK...
     
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  10. funflair

    funflair Funster Life Member

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    As said it is the brightness of the sun but if the panel is flat on the roof it won't generate the same in the winter as the sun is too low compared to summer, panels work best pointed at the sun.

    Martin
     
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