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
Start a Discussionhttps://teslamotorsclub.com/tmc/tags/

Portable in-car battery

Discussion in 'Model S' started by dsnows, Oct 5, 2017.

Tags:
  1. dsnows

    dsnows Member

    Joined:
    Feb 14, 2017
    Messages:
    76
    Location:
    Winchester, VA
    I would love for Tesla to offer a portable battery that can be carried in the car to extend the range. (Think iPhone battery case.) Perhaps a power wall that fits in the storage space under the rear deck or lays flat in the cargo space. It should plug into the main battery system. Charge the accessory battery when charging the main battery. Even if only 15-20 kWh would add significant range for a road trip.

    Any reason this is technically not feasible?
     
  2. Mysterylectric

    Mysterylectric Supporting Member

    Joined:
    Feb 12, 2017
    Messages:
    24
    Location:
    Long Island, NY
    Voltage. You'd need either a 400V system to parallel with the existing battery, or run it like an add on module, which would raise the pack voltage (and would need to be at the same voltage as the modules in the pack), and the system would need a massive regulator to keep the voltage limited to 400V. It sounds great, but implementing such a setup would take a lot of R&D. It's next to impossible to do as a retrofit.
     
    • Like x 1
  3. MSDadMich

    MSDadMich Member

    Joined:
    Aug 22, 2017
    Messages:
    87
    Location:
    Michigan
    Sounds like someone is considering a project...
     
  4. buttershrimp

    buttershrimp Supporting Member

    Joined:
    Jun 17, 2017
    Messages:
    1,004
    Location:
    ATX
    • Like x 1
  5. JHWJR

    JHWJR Member

    Joined:
    Jan 31, 2017
    Messages:
    379
    Location:
    Pittsburgh PA
    Would you want this battery device to weigh more or less than 1,000 lbs., and would you put another one in the frunk to off set the strange weight distribution?
     
  6. pinball_player

    Joined:
    May 3, 2017
    Messages:
    39
    Location:
    Metrowest, MA
    How about a bigger battery instead? My comment is where do you stop? If 100 kWh is not enough, about 110 kWh? Then of course 110 kWh is not enough.
     
    • Like x 1
  7. MSDadMich

    MSDadMich Member

    Joined:
    Aug 22, 2017
    Messages:
    87
    Location:
    Michigan
    That's an easy one for me. You stop when you feel there is enough of a personal safety factor to make it to the next charging station in any conditions. I think we are there. Of course if tech comes out that will extend the range with a similar weight and volume batt, at a similar price, why not use it... right?
     
  8. BrettS

    BrettS Member

    Joined:
    Mar 28, 2017
    Messages:
    489
    Location:
    Orlando, FL
    I think there’s more to it than that. Certainly being able to make it from one charging station to the next is good and is the minimum you need for long distance travel, but it’s not always convenient. I took a 1000 mile road trip with my S60 a few months ago and tried to time super charger stops with meals. For the most part I was successful as we were typically only traveling around 200 miles a day.

    However, one day we went 350 or 400 miles and we had lunch at our first supercharger stop, but the second stop was less than 3 hours later and no one was ready for dinner at that point, so we sat in a Starbucks for 45 minutes and waited.

    For long distance travel the ability to have a battery that’s big enough to allow you to skip charging stations if you’re not ready to stop... or even to be able to drive for a whole day without stopping would definitely be good, but clearly we aren’t there yet.

    That said, though, there is a question of how much people would be willing to spend on bigger batteries. I routinely take 150-160 mile round trips with my S60 and the battery I have is perfect for those trips. I can make it there and back without stopping to charge. I rarely travel long distance and while a bigger battery would be nice for long trips I don’t do it frequently enough that it’s worth spending money on. I’m happy with my 60 knowing that it is enough to get me from one charging station to the next on the occasional long distance trips that I do.

    For people who travel long distance all the time a bigger battery that lets them travel for half a day or even all day between charges could definitely be useful.
     
  9. dsnows

    dsnows Member

    Joined:
    Feb 14, 2017
    Messages:
    76
    Location:
    Winchester, VA
    Haven’t thought about, but a standard power wall provides 13.5 kWh and only weighs 275 lbs. that’s no more weight than a couple passengers or some luggage. That would give you 30-40 mi. additional range. Make it 1.5X that size and you’ve got some real range (~50 mi.) and still only ~400 lbs.
     
  10. dsnows

    dsnows Member

    Joined:
    Feb 14, 2017
    Messages:
    76
    Location:
    Winchester, VA
    Two things:
    1. I don’t usually need the bigger battery/longer range. I only need it on a long trip.
    2. I already have a battery that I’m stuck with. It would be nice to get the booster to use when I need it without replacing my car.
     
  11. SSedan

    SSedan Member

    Joined:
    Jul 24, 2017
    Messages:
    94
    Location:
    Greenville Wisconsin
    And you are talking adding weight outside the wheelbase compromising weight distribution and handling vs. typical passenger weight location.
    How about cooling, a small pack used independent after the big battery is going to be relatively highly loaded.

    To someone who lives at a desk this is easy, to those with any mechanical experience, this is not so easy and not worth Tesla's time and money.
     
    • Like x 1
  12. arcus

    arcus Member

    Joined:
    Aug 11, 2017
    Messages:
    464
    Location:
    Denton, TX
    To sum up I can see a few reasons why not: safety (high voltage/amperage), extra weight of the battery (how would you handle getting it into the car?), not to mention negative impact on car's weight.
     
  13. JHWJR

    JHWJR Member

    Joined:
    Jan 31, 2017
    Messages:
    379
    Location:
    Pittsburgh PA
    Do you leave that in the car all the time and cart that much more weight around all the time? And if not, how exactly do you get this 275 lb. device in and out of the car?
     

Share This Page