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Changing Solar Numbers

Discussion in 'Tesla Energy' started by dhquigley, Mar 5, 2021 at 8:56 AM.

  1. dhquigley

    dhquigley Member

    Joined:
    May 21, 2020
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    Location:
    Brookeville, MD
    On Tuesday, I had a good solar day, hitting 43.6 kwh on my 11.28 system when I checked before bedtime, or so I thought. Looking at numbers today, which will be a great day, I scrolled back in time and the Tuesday number now shows as 41.6. Have others seen the app retroactively change the solar production? Anybody know the cause?
     
  2. wjgjr

    wjgjr Member

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    955
    Location:
    Silver Spring, MD
    Yep - I have mentioned this before. It is always 3 days in the past, and it seems to drop in the morning (or overnight - I have not attempted to figure out exactly when) and get back to its correct value by the evening. (For reference, I got 27.9 kWh Tuesday, but the app showed 17.0 this morning and now shows 20.6.)

    As a side note, since you are in the area. even though Wed was seemingly just as clear, I only got 27.0 kWh, which I think might partly have been due to the warmer temps. (There might also have been just a bit of haze.)
     
    • Informative x 2
  3. dhquigley

    dhquigley Member

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    Location:
    Brookeville, MD
    Really helpful, thanks. Noticed the same phenomenon. Think today could be a banner day if it stays clear.
     
  4. trautmane2

    trautmane2 Member

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    Location:
    Leesburg, VA
    Curious - have you observed this just in the Tesla app or in the API data as well?

    same for me: Tuesday: 31.2 kWh, Wednesday: 29.3 kWh
     
  5. wjgjr

    wjgjr Member

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    Location:
    Silver Spring, MD
    Yeah - finally making up for a dreadful Jan/Feb production-wise, even compared to PVWatts estimates.

    FYI, the totals also seem to affect weekly and monthly numbers (and probably yearly/lifetime.) So, if you ever want monthly numbers right when the new month starts, wait until the 4th, check at night, or remember to adjust for the low number.
     
  6. wjgjr

    wjgjr Member

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    Location:
    Silver Spring, MD
    It is only in the app for me - the API data that I pull is all instantaneous, and so it is not affected. That is actually one of the ways I noticed it was doing some sanity checks on data from the API and noting the discrepancy. Also, if I use the option in the app to download the data, that appears unaffected, so the bug appears to be specific to the calculations in the app, and really (at least for me) only ever affects 3 days ago. Why there is something special about how they handle 3 days ago, I have no clue. I could understand today or yesterday, but 3 days ago is just weird.
     
  7. trautmane2

    trautmane2 Member

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    166
    Location:
    Leesburg, VA
    Good to know - thanks. I've switched to pulling historical data from Tesla's energy API ( State And Settings ) and have only been looking at the app for current day info. I had not noticed the 3-day bug in the historical data I've pulled over the last month or so.

    The API - which the app likely also uses - requires a request for each day and returns a list of solar_power and grid_power values for each 15-minute interval (for me - no powerwalls). I have no idea what's special about 3 days, but maybe it's some kind of caching bug in the app where the intent is to immediately grab the 3 most recent days of data but they accidentally only get 2+ days.
     
  8. dhquigley

    dhquigley Member

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    May 21, 2020
    Messages:
    85
    Location:
    Brookeville, MD
    Glad you said that about Jan and Feb. I was running pretty far below PVWatts (like 20-30% below) and beginning to think I had greatly overestimated (which I may have anyway). Seem to be more on pace this month.

    In terms of the local area crew, really liked my solar roof crew, although the head of it just got promoted to quality. The initial roofing company was good, although it seems like they do not get every job. Come to think of it, the Powerwall team was also very good. In this area, your crew can come from Baltimore or Beltsville. Mine was from Baltimore. WJGJR is right though. The crews are fantastic. Communications less so, but I will say I feel like they have worked on that. I would suggest that once you find a responsive person, you tie yourself to them forever, as best you can. I will echo that everyone seems very concerned about getting this right, in ways that I have found surprising. Big fan.
     

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