TMC is an independent, primarily volunteer organization that relies on ad revenue to cover its operating costs. Please consider whitelisting TMC on your ad blocker and becoming a Supporting Member. For more info: Support TMC

Long shot: third party simulator to compare SDG&E rate plans

Discussion in 'California' started by Ohmie, Sep 22, 2019.

  1. Ohmie

    Ohmie Member

    Joined:
    Sep 8, 2019
    Messages:
    40
    Location:
    San Diego, CA
    SDG&E has their own rate plan simulator. But it only works if you’ve had service for a year, with no significant changes in usage. I recently purchased my house, added solar and am about to take delivery of a Model S LR. So the SDG&E simulator can’t help.

    Looking for a third party simulator that would allow me to input estimated usage and generation so I can compare rate plans. I tried googling but struck out.

    Anyone know if this kind of tool exists?
     
  2. forkee

    forkee Member

    Joined:
    Jul 20, 2018
    Messages:
    602
    Location:
    Southern California
    it really varies between households, that's why the simulator needs the history. factors like how much energy you use throughout the day, every day in different months, seasons, etc, how your household responds to the change in weather (some people run AC all the time, or when it gets mildly warm, or only when it's 100+) also power generated from solar fluctuates throughout the seasons, and your consumption may vary especially now that you will be using an EV.

    what rate plans are you trying to compare? is it just tiered vs time of use? it all comes down to how much electricity you use during the day and how much you can defer till night. usually EV users switch to TOU rates because they can fill up at considerable lower night time rates than even 1st tier energy usage. Plus having TOU and solar lets you sell back electricity during the day when 1) you are generating and 2) rates are higher, then allow you to buy it back at night when rates are 1/3rd the price.
     
    • Like x 1
  3. Ohmie

    Ohmie Member

    Joined:
    Sep 8, 2019
    Messages:
    40
    Location:
    San Diego, CA
    @forkee thanks for the reply.

    We don’t use much electricity for the majority of the year. Before considering electricity generated, I would guess we are below baseline for coastal San Diego from November - June. But July - October we may be 150% of baseline due almost entirely to the AC.

    Most of our summer use is after 9 pm.

    I plan to charge our first EV during the super off peak time frame. If all goes well we will add a second EV sometime next spring, and charge during the same time period (alternate each night). I’m expecting to drive about 12k miles on each car.

    Even with the heavy use of AC, we are currently generating an extra 80kwh per week.

    I think we will be better off with a TOU plan. I’m just not sure which one.

    SDGE currently has us on TOU-DR1-residential.
     
  4. SanDiegoM3

    SanDiegoM3 Member

    Joined:
    Apr 26, 2019
    Messages:
    113
    Location:
    San Diego, CA
    I haven’t found a simulator that considers all the different SDGE plans, but I made some excel sheets.

    Generally speaking, a TOU-5 plan is ideal for non solar because of the super off peak rates that go through the weekend and holidays. If you have a Tesla powerwall then go TOU5 because you can store solar and use that energy at opportune times.

    Tou5 is awesome. The dollar difference between flatter TOU plans and the tou5 is relatively immaterial to be honest if you have solar.
     
    • Like x 1
  5. SanDiegoM3

    SanDiegoM3 Member

    Joined:
    Apr 26, 2019
    Messages:
    113
    Location:
    San Diego, CA
    I should note. You have to take into account the shift from baseline allowance on DR1. You will absolutely go over that baseline with an EV. On TOU5 there is no baseline calculation to deal with.
     
    • Like x 1
  6. Ohmie

    Ohmie Member

    Joined:
    Sep 8, 2019
    Messages:
    40
    Location:
    San Diego, CA
    I wonder if going over baseline would make it worth going to TOU5 even with solar?
     

Share This Page

  • About Us

    Formed in 2006, Tesla Motors Club (TMC) was the first independent online Tesla community. Today it remains the largest and most dynamic community of Tesla enthusiasts. Learn more.
  • Do you value your experience at TMC? Consider becoming a Supporting Member of Tesla Motors Club. As a thank you for your contribution, you'll get nearly no ads in the Community and Groups sections. Additional perks are available depending on the level of contribution. Please visit the Account Upgrades page for more details.


    SUPPORT TMC