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  • FIRST POST
    • michael8626
    • By michael8626 15th Sep 19, 8:38 PM
    • 50Posts
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    michael8626
    Solar
    • #1
    • 15th Sep 19, 8:38 PM
    Solar 15th Sep 19 at 8:38 PM
    Hi,

    I have a friend who is using around 30,000kWh per year.

    What would they need to generate this amount from solar panels? Ie number of panels, the cost involved to achieve this and the time for return on investment?

    Thanks
Page 1
    • Cardew
    • By Cardew 16th Sep 19, 7:39 AM
    • 27,974 Posts
    • 13,832 Thanks
    Cardew
    • #2
    • 16th Sep 19, 7:39 AM
    • #2
    • 16th Sep 19, 7:39 AM
    Completely impractical proposition for many reasons.

    Living in the south of UK, with a south facing garden, he would need around 120 250wp panels to even generate 30,000kWh in a year. You would need a roof the size of the Albert Hall, so would need them on racks in a garden.

    In summer you would generate huge amounts of electricity that you just couldn't use, unless you could store it in batteries costing 100,000??

    Some days in winter, you would generate next to nothing and of course nothing at night. Electricity authorities unlikely to allow such a set up.

    In effect it would be a solar farm.
    • stivemorgan
    • By stivemorgan 16th Sep 19, 8:36 AM
    • 2 Posts
    • 0 Thanks
    stivemorgan
    • #3
    • 16th Sep 19, 8:36 AM
    • #3
    • 16th Sep 19, 8:36 AM
    Hi guys. I have heard so many times about solar panels. Is it really profitable to have them not as the main source of electricity but as some device which can decrease electricity bill in summer for example? Or it is a bad idea?
    • michael8626
    • By michael8626 16th Sep 19, 8:54 AM
    • 50 Posts
    • 2 Thanks
    michael8626
    • #4
    • 16th Sep 19, 8:54 AM
    • #4
    • 16th Sep 19, 8:54 AM
    Completely impractical proposition for many reasons.

    Living in the south of UK, with a south facing garden, he would need around 120 250wp panels to even generate 30,000kWh in a year. You would need a roof the size of the Albert Hall, so would need them on racks in a garden.

    In summer you would generate huge amounts of electricity that you just couldn't use, unless you could store it in batteries costing 100,000??

    Some days in winter, you would generate next to nothing and of course nothing at night. Electricity authorities unlikely to allow such a set up.

    In effect it would be a solar farm.
    Originally posted by Cardew
    We have got 88 acres, but looking at your reply costs would far outway any benefits.
    • Cardew
    • By Cardew 16th Sep 19, 6:15 PM
    • 27,974 Posts
    • 13,832 Thanks
    Cardew
    • #5
    • 16th Sep 19, 6:15 PM
    • #5
    • 16th Sep 19, 6:15 PM
    Hi guys. I have heard so many times about solar panels. Is it really profitable to have them not as the main source of electricity but as some device which can decrease electricity bill in summer for example? Or it is a bad idea?
    Originally posted by stivemorgan
    This is a UK forum and our regulations are different to those in Detroit.
    • markin
    • By markin 17th Sep 19, 12:14 PM
    • 847 Posts
    • 692 Thanks
    markin
    • #6
    • 17th Sep 19, 12:14 PM
    • #6
    • 17th Sep 19, 12:14 PM
    If you save 350 a month for 9 months a year it would still pay back in 10 to 15 years, install cost being around 30-40K 10k of that being the ground mount?

    *Using 0.14p unit


    A 15KWP system may be more sensible if you cant sell the surplus at a good rate.
    Last edited by markin; 17-09-2019 at 12:19 PM.
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