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Time of use Charging?

Discussion in 'Model S: Battery & Charging' started by chriSharek, May 25, 2015.

  1. chriSharek

    chriSharek Member

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    We recently received the "smart" meters from our power utility so they can tell not only how much energy you are using, but WHEN you're using it.

    Can the MS be programmed to come on and charge during the lower rates, for those that have lowered rates during off-peak hours?

    Our 4 year old Volt can do that - I don't recall reading anything about whether the MS could. Thanks, cs
     
  2. mmccord

    mmccord Member

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    Yes, it supports scheduled charging.
     
  3. araxara

    araxara S-P85#3,218 X-90D#3,299

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    You can set a starting charge time, but you can only set a single time and no ending time. Charging can begin automatically a few hours after the starting time if you happen to plug in after the starting time. It’s not a very flexible scheduler. I have mine now set to 1am which is well within my cheap TOU rate times and which gives enough time for charging to complete by morning (with a HPWC). This also assures that my car has minimal charge loss due to vampire drain. There is also no setting for day of week. If I need to charge immediately when I plug in I either manually start charging or use the Remote S Apple Watch app.
     
  4. wk057

    wk057 Senior Tinkerer

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    The scheduling is lacking compared to other EVs (like the Volt, which allows a full schedule with multiple rate tiers), but it gets the job done. Just make sure your rate schedule makes sense and you wont end up with no real savings or even an increase in costs by switching to ToU.
     
  5. David99

    David99 Active Member

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    The only thing you can do in the Tesla is set the charge timer. For example if your lowest electricity rate starts at midnight, set the can's charge timer to that time (or maybe a few min later to be on the safe side). Once the time is set the car won't charge during the day and will start again the next night at midnight.
     
  6. tliving

    tliving Member

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    You could get more fancy with VisibleTesla.
     
  7. Larry Chanin

    Larry Chanin Model S Perf Sig 1055

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    #7 Larry Chanin, May 25, 2015
    Last edited: May 25, 2015
    Chris,

    Yes, as others have stated the Model S has a simple timer.

    However, our utility does not have EV rates. You would merely be making a donation to the utility without any quid pro quo.

    Whereas you could go to the expense of adding another meter and going with residential time of use rates, as was mentioned you had better be very careful. If you don't do a good job of shifting load off-peak you could actually end up spending more on your electric bill.

    Here is are some excerpts of messages that I received in 2012 from a club member discussing the subject:


    Perhaps things have since changed, but I'm guessing not.

    Larry
     
  8. David99

    David99 Active Member

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    Even if you don't have a lower off-peak rate, it makes sense to charge at off peak times. It helps even out grid load and it helps keeping your battery at a lower state of charge by starting to charge later.
     
  9. RyanT

    RyanT Member

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    I had a Volt, now a Tesla on tou. One nice thing about the Tesla is it remembers your setting per charge staion. At home I have mine set to start charging at midnight and don't have to adjust it when I go to charge on other 14-50s.
     
  10. chriSharek

    chriSharek Member

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    Thanks everyone. This is great info.

    Larry, I'll find a link or information about FPL's TOU rates. It was VERY recently introduced. I'll find and forward when I can. cs
     
  11. EriCal

    EriCal Member

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    Visible Tesla is VERY helpful. Our power company (SCE) also provides a site that allows for monitoring usage etc. We use both and, as a result of careful planning of our usage, have an electric bill that is LESS than it was before the Tesla!!

    Eric 1014 S 85. (Her's) All the goodies except pano.
     
  12. Cyclone

    Cyclone Active Member

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    #12 Cyclone, May 28, 2015
    Last edited: May 28, 2015
    Sounds like you've seen Duke Energy NC's rate schedules! :)

    For others who are interested...
    This is my current rate schedule = http://www.duke-energy.com/pdfs/NCScheduleRE.pdf
    This is the ToU schedule I would be subject to = http://www.duke-energy.com/pdfs/NCScheduleRT.pdf

    So, in my case, I'll stick with my regular plan!
     
  13. GSP

    GSP Member

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    TOU rates may not be a good deal for everyone, but it is a big world out there (yes, it even extends past certain states in the USA!). :rolleyes:

    My utility offers a seperate meter with TOU for EV charging only. They will supply the meter, but you have to install the meter base (only $50-100). This is a great deal, and over 90% of my charging is off-peak at <$0.04/kWh (depends on utility fuel cost adjustment).

    Even without TOU rates, "charge based on departure time" is a great feature that I use every day to leave with a warm battery on winter mornings. It also would be useful when charging to 100% to minimize the time spent there. I hope Tesla can get around to adding this in the next year or so. They do have lots of high priority work to expand their company, but did I mention this is a GREAT feature, and easy to program?

    GSP
     
  14. chriSharek

    chriSharek Member

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    Great points - and the sooner the power companies get on board with it, the better for us (saves us $), and the better for them (reduces their peak demands).

    Cyclone, Duke will be the LAST one to get on board! Sorry! :(
     
  15. 3mp_kwh

    3mp_kwh Member

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    When saddled with demand charges, they aren't. If Cyclone peaked at 50kw, it looks like he'd have an extra $388 on his bill?

    On-peak Demand charges will spur Powerwall sales. Just not where rates are ~$.10/kwh.
     
  16. Cyclone

    Cyclone Active Member

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    Meanwhile, my pre-Tesla monthly electric bill in an all-electric 3k sq ft. multi-story house is $80-$130, with December being $180 because I'm the Griswold in the neighborhood.
     
  17. chriSharek

    chriSharek Member

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    LOL!
     

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