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EVs won’t impact FL power grid, but could affect specific neighborhoods

Discussion in 'Florida' started by Larry Chanin, Jan 13, 2013.

  1. Larry Chanin

    Larry Chanin Model S Perf Sig 1055

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    Electric Cars Won’t Have Impact On Florida Power Grid

    Please refer to the following thread to address the issue in the above highlighted paragraph.

    Florida Power & Light (FPL) would like our assistance

    Larry
     
  2. NigelM

    NigelM Recovering Member

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  3. Larry Chanin

    Larry Chanin Model S Perf Sig 1055

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    #3 Larry Chanin, Jan 13, 2013
    Last edited: Jan 14, 2013
    Thanks Nigel,

    Of course Jim's situation was rather extreme having a 200 amp continuous load even before adding the 40 amps to charge his Model S. Nevertheless, it makes sense to let the power company know when you add significant loads such as a Model S.

    Larry
     
  4. NigelM

    NigelM Recovering Member

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    True, Jim's situation was extreme; however, we needed an upgrade of the incoming cable when we installed PV at our last house. That house was older and would maybe have struggled with 2 EV HPWCs and 2 ACs running at once if there was any other serious draw such as stove top or washer and dryer.
     
  5. ClearwaterBchSteve

    ClearwaterBchSteve P445 / VIN 1794

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    Our beach home is older as well. I still have a fuse box and need to replace it with a new curcuit-breaker panel and 200A service before I can permanently install a NEMA 14-50. For regular small daily commute, I use 120v but have rigged up a converter cable to allow me to use 240V @ 35A from my existing dryer plug if I need faster charging. The permanent 14-50 will be installed at the front of the garage to facilitate easy access for guest charging.
     
  6. Larry Chanin

    Larry Chanin Model S Perf Sig 1055

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    Here's an excerpt from the report referenced in the first posting.

    Report of Electric Vehicle Charging

    Chargers supported by Transformer Size.jpg


    The chart shows that even a relatively large 100 kva transformer will only support a single 6.6 kW charger.

    A NEMA 14-50 outlet behind a 50 amp breaker will draw about 9.6 KW.

    A Roadster High Power Wall Connector will draw 16.8 KW.

    A Model S High Power Wall Connector will draw 19.2 KW.

    These are based on nominal voltages it is not uncommon to for the voltage to be plus or minus 5% so in the worst case a Model S HPWC could draw 20 KW.

    Larry
     
  7. ClearwaterBchSteve

    ClearwaterBchSteve P445 / VIN 1794

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    That's very interesting data Larry. Being on the beach, we still have elevated power distribution and by looking at my rusted out transformer out front on the pole, I doubt I would be able to safely deploy an HPWC. Even after I get my fuse box replaced with with breakers and a new cable entry into the house installed, my 14-50 plus stove, oven, dryer, hot water, HVAC, etc. will most likely be the max for the infrastructure which supplies my house - all of those in use simultaneously would be > 200A.
     
  8. NigelM

    NigelM Recovering Member

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    Mod note: Thread title updated by OP request.
     
  9. Larry Chanin

    Larry Chanin Model S Perf Sig 1055

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    Hi Steve,

    For economic reasons power companies rely on load diversity to deliberately run their equipment above their nameplate ratings. This is based on the premise that most equipment has a duty cycle and doesn't run continuously, or all loads don't have coincident peak use. (A premise that was for the most part incorrect with respect to Jim's situation described in the link provided by Nigel in posting #2.)

    If you haven't contacted your power company I would. If it is FPL you might start following the link I provided in the first posting. If there is any chance of you getting an HPWC I would let them know.

    Larry
     
  10. ClearwaterBchSteve

    ClearwaterBchSteve P445 / VIN 1794

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    Larry, I have no plans to install an HPWC. I did not get twin chargers. Currently I alternate my makeshift temporary 14-50 with my dryer so I'm well under my limits if other high-draw devices in the house were pulling current. My concern is after a dedicated 14-50 is installed, the dryer could also be running at the same time along with other big items. When I get the fuse box replaced with a breaker panel, I will have 200A service which should be fine. Our house is not huge - only one HVAC system for example.

    Thanks for your insight. Our power is supplied by Progress Energy.

    Steve.
     
  11. Larry Chanin

    Larry Chanin Model S Perf Sig 1055

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    You'll still be drawing 40 continuous amps so I would call Progress Energy to let them know and see if they want to heavy-up that overhead transformer.

    Larry
     

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