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Big smile as electric bill arrives post-Tesla solar install

Discussion in 'Tesla Energy' started by WSE51, Aug 29, 2019.

  1. WSE51

    WSE51 Member

    Joined:
    Aug 24, 2012
    Messages:
    105
    Location:
    Southern California
    Los Angeles DWP invoices every two months.

    My first two month invoice fully on Tesla Solar/Powerwall arrived today, and it worked out just as I hoped.

    Due to my home orientation and roof gables, I was limited in the amount of solar panels I could install.

    Even though the solar system only produced about 36% of the total electricity used, 88% of the High Peak usage was eliminated. Tesla's time-of-use algorithms nailed it.

    My invoice was 54% lower than last year’s August invoice.

    Hurray for Tesla, and my thanks to them for sticking it out through the tough LADWP and City of LA regulatory maze.
     
    • Like x 1
  2. Big Dog

    Big Dog Active Member

    Joined:
    Mar 7, 2016
    Messages:
    1,329
    Location:
    Irvine, CA
    sorry to rain on your celebration, but I hope that you realize that this SoCal summer has been cooler than last, by several degrees. (My August bill was much lower as well, even without solar panels.)
     
  3. WSE51

    WSE51 Member

    Joined:
    Aug 24, 2012
    Messages:
    105
    Location:
    Southern California
    Big Dog, you are correct that a more careful statistical analysis is in order. Thank you.

    I just did it, having downloaded the daily usage and production statistics from Tesla for the exact dates covered by the DWP invoice. My home usage for the 59 days ending 8/23/19 was lower than for the same period in 2018 --- but only 6.1% lower. My invoice was 54% lower.

    There was one additional factor - in 2018 I was not on TOU and the great majority of my invoice was at the price of 28.71 cents per KwH. In 2019, I was on TOU rates, and the High Peak Rate was only 26.08 cents. So even without any solar/Powerwall system, and even if all my usage was at High Peak, I would have saved about 9.2%

    So perhaps 15%-16% of savings was not attributable to the solar/Powerwall system and around 38% savings was solar/Powerwall.

    One final statistic. DWP says that my home usage was about 1.7% higher than Tesla says it was. While that is close enough for me, I am curious how this compares with others' experience.
     

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