energy per day from a 5KW system?

Discussion in 'Photovoltaics' started by Harry B, Feb 12, 2010.

  1. Harry B

    Harry B Guest

    I am thinking seriously about installing a 5KW photovoltaic system.
    It will be grid connected.
    The area I live in averages 7.5 hours of sunshine per day (taken over a
    100 year period.)

    How much outpout in kilowatt-hours might I average per day, year round.

    One reference says maybe 20kW-hours per day average over a year.

    Can anyone suggest some links that might help answer the question?
     
    Harry B, Feb 12, 2010
    #1
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  2. Harry B

    Harry B Guest

    On 13/02/2010 1:20 PM, Josepi wrote:
    > Think again on the 7.5 hours. Useful time is typically 3-4 hours unless you
    > gonna' track the sun.
    >
    > Check sun chart calculators for real figures.
    >
    > Is this a waste money project?
    >
    >
    > "Harry B"<> wrote in message
    > news:4b75d990$...
    > I am thinking seriously about installing a 5KW photovoltaic system.
    > It will be grid connected.
    > The area I live in averages 7.5 hours of sunshine per day (taken over a
    > 100 year period.)
    >
    > How much outpout in kilowatt-hours might I average per day, year round.
    >
    > One reference says maybe 20kW-hours per day average over a year.
    >
    > Can anyone suggest some links that might help answer the question?
    >
    >


    Is this a waste money project?
    Good question.
    Where I live the government is providing a huge incentive.
    The incentive is a gross feed in tariff at 3 times the retail price of a
    kWh unit.

    Why do you say useful time is typically 3-4 hours as opposed to say 4-5
    hours or 2-3 hours?
     
    Harry B, Feb 13, 2010
    #2
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  3. Harry B

    Harry B Guest

    On 13/02/2010 3:01 PM, Mike Brown wrote:
    > I have a 5KW system located in Paso Robles, California, halfway
    > between San Francisco and Los Angeles. I've written an application
    > that show the production data for every day the system has been in
    > operation. Just go to the site and click on the app's screen image.
    > If you have a recent version of Java installed, the app will launch
    > and you can explore daily, weekly, yearly and lifetime data. Go to
    > the Custom Day tab and check the data for June 21 and December 21 and
    > you can see the shortest and longest power-generating days of the year
    > (although December is normally cloudy and rainy). My system peaks
    > around 35 KWH in the summer and drops to about 22 KWH on a clear day
    > in the winter. Let me know if you have any questions. I work for a
    > solar power company and can probably get you more in-depth data if you
    > need it. We use the PVWatts system from NREL among other tools to
    > predict our system's power output: http://rredc.nrel.gov/solar/codes_algs/PVWATTS/version2/
    >
    > http://www.mike-land.com/Solar_Power/solar_power.html
    >
    > Mike Brown
    >
    >
    > On Feb 12, 2:43 pm, Harry B<> wrote:
    >> I am thinking seriously about installing a 5KW photovoltaic system.
    >> It will be grid connected.
    >> The area I live in averages 7.5 hours of sunshine per day (taken over a
    >> 100 year period.)
    >>
    >> How much outpout in kilowatt-hours might I average per day, year round.
    >>
    >> One reference says maybe 20kW-hours per day average over a year.
    >>
    >> Can anyone suggest some links that might help answer the question?

    >


    Wow. You have some great info on this site. Congratulations.
    I am trying to work out some of the scales on your graphs as to whether
    you are talking gross or net, ow why your cumulative meter readings over
    a year can have dips in them.
    I will look more closely at a later stage.
     
    Harry B, Feb 13, 2010
    #3
  4. Harry B

    Guest

    Josepi <> wrote:
    > Think again on the 7.5 hours. Useful time is typically 3-4 hours unless you
    > gonna' track the sun.


    Saying that typical sun time is 3-4 hours is no more reasonable than saying
    it is 7.5 hours, unless there is a geographical reference supplied.

    Someone else mentioned PVWatts version 2, but I prefer Version 1
    http://rredc.nrel.gov/solar/codes_algs/PVWATTS/version1/
    Predicted solar energy available, based on real observation points around
    the US and the world.

    For my installation:
    PVWatts for a nearby station, 4500 DC, 84%, 26 tilt, 214 az, 15.3 cents.
    (kWh/m2/day) (kWh) ($)
    Year 5.42 6777 1036.88
    021506-021507 actual 6751 generated, 99.6% of NREL prediction.

    http://cdold.home.mchsi.com/Solar-generation.htm $1775 avoided in 2008

    --
    Clarence A Dold - Hidden Valley Lake, CA, USA GPS: 38.8,-122.5
     
    , Feb 13, 2010
    #4
  5. Harry B

    Jean Marc Guest

    <"stevey" <> a écrit dans le message de news:
    <Sun for PV purposes, i.e. if you multiply your system's DC capacity 5
    <(KW) by
    <5(hour) and by 360 (days) = 9000 KWh. of AC KWh of energy, over a
    <year.
    <Good Luck,
    <-Steve

    .... NOT so sure:

    Here (France), you get roughly 1100 kWh/ year for 1kWc, for 100% (optimal)
    setting.
    (average)

    Look, for example:
    http://www.elecosolaire.fr/index.ph...ask=view&id=12&Itemid=32&limit=1&limitstart=1

    You'll surely find the same for the US

    HIH
    JM
     
    Jean Marc, Feb 15, 2010
    #5
  6. Harry B

    Guest

    spdx <> wrote:
    > > On Feb 12, 2:43 pm, Harry B <> wrote:
    > >> I am thinking seriously about installing a 5KW photovoltaic system.
    > >> It will be grid connected.
    > >> The area I live in averages 7.5 hours of sunshine per day (taken over a
    > >> 100 year period.)
    > >>
    > >> How much outpout in kilowatt-hours might I average per day, year round.
    > >>
    > >> Can anyone suggest some links that might help answer the question?


    http://cdold.home.mchsi.com/Solar-generation.htm $1,897 avoided in 2009

    In 2009, I had 4152 hours of run time, producing 6746 kWh on a 4500 Watt DC
    3800 Watt AC system. PVWatts nearby says 5.39 kWh/m2/day for my panel
    location, tilt and azimuth. South/38.8 would be 5.5 kWh/m2/day.

    http://rredc.nrel.gov/solar/codes_algs/PVWATTS/version1/
    Predicted solar energy available, based on real observation points around
    the US and the world.

    --
    Clarence A Dold - Hidden Valley Lake, CA, USA GPS: 38.8,-122.5
     
    , Jun 21, 2010
    #6
  7. Harry B

    Jean-Marc Guest

    Jean-Marc, Jun 21, 2010
    #7
  8. Harry B

    Guest

    Jean-Marc <> wrote:

    > <> a C)crit dans le message de
    > news:hvmvvk$nmq$...
    > >
    > > http://rredc.nrel.gov/solar/codes_algs/PVWATTS/version1/
    > > Predicted solar energy available, based on real observation points around
    > > the US and the world.


    > http://www.nrel.gov/rredc/pvwatts/


    > http://www.nrel.gov/rredc/pvwatts/version1.html


    I usually try to hit URLs to make sure they are still good before I post
    them, but I didn't expect a government site to move ;-(


    --
    Clarence A Dold - Hidden Valley Lake, CA, USA GPS: 38.8,-122.5
     
    , Jun 21, 2010
    #8
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