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  1. #411
    Veteran Member
    Join Date
    Feb 2009
    Posts
    1,691
    Location
    Northern NY
    Tractor
    Kioti CK27, 1940s Farmall A

    Default Re: Grid-tied solar

    Quote Originally Posted by houstonscott View Post
    Coal subsidies doesn't mean the government payed coal companies. LOL.


    HS.
    Federal coal subsidies - SourceWatch
    Federal coal subsidies are forms of financial assistance paid by federal taxpayers to the coal and power industry. Such subsidies include direct spending, tax breaks and exemptions, low-interest loans, loan guarantees, loan forgiveness, grants,......

    Not sure how you define "payed" ??

    Loren
    Kioti CK27 gear w/Loader
    1940s Farmall A

    12 acres, wife and dog Phoebe

  2. #412
    Elite Member houstonscott's Avatar
    Join Date
    Dec 2010
    Posts
    4,423
    Location
    Oglesby, Texas
    Tractor
    Kubota L3800, Kubota GR2120, Kubota RTV1100, Kubota 5100sc

    Default

    Coal subsidies doesn't mean the government payed coal companies. LOL.


    HS.

  3. #413
    Super Star Member dave1949's Avatar
    Join Date
    Apr 2009
    Posts
    10,556
    Location
    Industry, Maine
    Tractor
    New Holland TC40

    Default Re: Grid-tied solar

    The May, 2013 results.

    A little early since I won't be here for a reading on the 31st. No fancy interfaces or history recall here. It's the Amish version of PV solar. Actually, for a simple system like this, all that isn't really necessary.

    Above the model this month. The first half of May was one great solar day after another, not so much lately. As of noon for today, it produced 1.4 kWh. It's foggy and light drizzle, we will be lucky to get 2 kWh total today.

    Since installation on July 25, 2012, the total system output in AC kWh is 4214. The annual model prediction is 4447 AC kWh's.

    My net usage was 425 kWh, the system produced 375 kWh. If the next two days are partly sunny as forecast, production would be above 400 kWh.

    May of last year our usage was 344 kWh. The change-over to an electric water heater is increasing our usage by around 100 kWh's per month.

    The lengthening daylight hours as we approach the Summer Solstice on June 21 help, but not as much as one might think. Many of those increased daylight hours occur while the sun is north of true east or west--meaning the sun is shining on the back side of the collectors during those hours. We do get a little bit of output due to ambient light however.

    The PVWatts model AC kWh predicted/actual:
    2012
    Aug. 383/460.7
    Sep. 394/480.9
    Oct. 369/378.6
    Nov. 283/400.3
    Dec. 331/297.2
    2013
    Jan. 388/440
    Feb. 412/375
    Mar. 509/462
    Apr. 374/487
    May 353/375
    Jun. 308/TBD
    Jul. 341/TBD
    "Those were the days my friend, we thought they'd never end ..."
    When there is a huge solar energy spill, it is called a "nice day"!

  4. #414
    Member
    Join Date
    Apr 2010
    Posts
    38
    Location
    Fincastle, VA
    Tractor
    Kioti DK40SE HST

    Default Re: Grid-tied solar

    Dave,

    Just wanted to say THANX!!! for posting these numbers each month.

    I am in early stages of determining viability of PV system for our home and the reading (system performance and general comments) here is a great resource for me.

    Keith
    Kioti DK40SE HST
    KL401 FEL w/Ken's Bolt on hooks
    Loaded R1s
    Woods (Gill) R20 Rollover Box Blade
    TnT by FitRite Hydraulics

  5. #415
    Elite Member Redneck in training's Avatar
    Join Date
    Nov 2008
    Posts
    2,780
    Location
    South Central Iowa
    Tractor
    TYM 330 HST with FEL

    Default Re: Grid-tied solar

    Quote Originally Posted by dave1949 View Post
    The May, 2013 results.

    A little early since I won't be here for a reading on the 31st. No fancy interfaces or history recall here. It's the Amish version of PV solar. Actually, for a simple system like this, all that isn't really necessary.

    Above the model this month. The first half of May was one great solar day after another, not so much lately. As of noon for today, it produced 1.4 kWh. It's foggy and light drizzle, we will be lucky to get 2 kWh total today.

    Since installation on July 25, 2012, the total system output in AC kWh is 4214. The annual model prediction is 4447 AC kWh's.

    My net usage was 425 kWh, the system produced 375 kWh. If the next two days are partly sunny as forecast, production would be above 400 kWh.

    May of last year our usage was 344 kWh. The change-over to an electric water heater is increasing our usage by around 100 kWh's per month.

    The lengthening daylight hours as we approach the Summer Solstice on June 21 help, but not as much as one might think. Many of those increased daylight hours occur while the sun is north of true east or west--meaning the sun is shining on the back side of the collectors during those hours. We do get a little bit of output due to ambient light however.

    The PVWatts model AC kWh predicted/actual:
    2012
    Aug. 383/460.7
    Sep. 394/480.9
    Oct. 369/378.6
    Nov. 283/400.3
    Dec. 331/297.2
    2013
    Jan. 388/440
    Feb. 412/375
    Mar. 509/462
    Apr. 374/487
    May 353/375
    Jun. 308/TBD
    Jul. 341/TBD
    My system produced 3110 kWh (3720 kWh predicted) in May. 84% of predicted production.

  6. #416
    Super Star Member dave1949's Avatar
    Join Date
    Apr 2009
    Posts
    10,556
    Location
    Industry, Maine
    Tractor
    New Holland TC40

    Default Re: Grid-tied solar

    The June, 2013 results.

    Above the model this month.

    Since installation on July 25, 2012, the total system output in AC kWh is 4593. The annual model prediction is 4447 AC kWh's.

    The PVWatts model AC kWh predicted/actual:
    2012
    Aug. 383/460.7
    Sep. 394/480.9
    Oct. 369/378.6
    Nov. 283/400.3
    Dec. 331/297.2
    2013
    Jan. 388/440
    Feb. 412/375
    Mar. 509/462
    Apr. 374/487
    May 353/375
    Jun. 308/379
    Jul. 341/TBD
    "Those were the days my friend, we thought they'd never end ..."
    When there is a huge solar energy spill, it is called a "nice day"!

  7. #417
    Super Star Member dave1949's Avatar
    Join Date
    Apr 2009
    Posts
    10,556
    Location
    Industry, Maine
    Tractor
    New Holland TC40

    Default Re: Grid-tied solar

    The July, 2013 results.

    Two sunny days above the model this month after a very slow start.

    As of July 25, 2013 for one complete year of operation, the system produced 4,895 AC kWh. This is 10% above the NREL prediction of 4,447 AC kWh.

    I think plus/minus 10% is acceptable.

    The PVWatts model AC kWh predicted/actual:
    2012
    Aug. 383/460.7
    Sep. 394/480.9
    Oct. 369/378.6
    Nov. 283/400.3
    Dec. 331/297.2
    2013
    Jan. 388/440
    Feb. 412/375
    Mar. 509/462
    Apr. 374/487
    May 353/375
    Jun. 308/379
    Jul. 341/377
    "Those were the days my friend, we thought they'd never end ..."
    When there is a huge solar energy spill, it is called a "nice day"!

  8. #418
    Super Star Member dave1949's Avatar
    Join Date
    Apr 2009
    Posts
    10,556
    Location
    Industry, Maine
    Tractor
    New Holland TC40

    Default Re: Grid-tied solar

    The July, 2013 results.

    Two sunny days above the model this month after a very slow start.

    As of July 25, 2013 for one complete year of operation, the system produced 4,895 AC kWh. This is 10% above the NREL prediction of 4,447 AC kWh.

    I think plus/minus 10% is acceptable.

    The PVWatts model AC kWh predicted/actual:
    2012
    Aug. 383/460.7
    Sep. 394/480.9
    Oct. 369/378.6
    Nov. 283/400.3
    Dec. 331/297.2
    2013
    Jan. 388/440
    Feb. 412/375
    Mar. 509/462
    Apr. 374/487
    May 353/375
    Jun. 308/379
    Jul. 341/377
    "Those were the days my friend, we thought they'd never end ..."
    When there is a huge solar energy spill, it is called a "nice day"!

  9. #419
    Super Star Member dave1949's Avatar
    Join Date
    Apr 2009
    Posts
    10,556
    Location
    Industry, Maine
    Tractor
    New Holland TC40

    Default Re: Grid-tied solar

    Some news about power availability while the grid is down.

    Sunny Boy (SMA America) now offers a grid-tied inverter that produces up to 1500 watts at a dedicated outlet when the grid is down and the sun is shining--without batteries. Not much, but enough to charge phone and laptop batteries or brew a pot of coffee. Any minor disaster is bearable with coffee.

    SUNNY BOY 3000TL-US / 4000TL-US / 5000TL-US.*SMA America, LLC
    "Those were the days my friend, we thought they'd never end ..."
    When there is a huge solar energy spill, it is called a "nice day"!

  10. #420
    Veteran Member
    Join Date
    Sep 2002
    Posts
    2,379
    Location
    Michigan

    Default

    Quote Originally Posted by dave1949 View Post
    Some news about power availability while the grid is down.

    Sunny Boy (SMA America) now offers a grid-tied inverter that produces up to 1500 watts at a dedicated outlet when the grid is down and the sun is shining--without batteries. Not much, but enough to charge phone and laptop batteries or brew a pot of coffee. Any minor disaster is bearable with coffee.

    SUNNY BOY 3000TL-US / 4000TL-US / 5000TL-US.*SMA America, LLC
    This is a great feature and it would seem that it could be done at a minimal cost.

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