Software fix from Tesla could help calm safety concerns

A new software update from Tesla Motors (TSLA +2.5%) reportedly reduces the power charge current by 25% to a Model S in cases when there are wild swings from the charging source.

The precaution could alleviate safety concerns over home wiring systems or faulty electronics.

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Comments (17)
  • hneumann
    , contributor
    Comments (630) | Send Message
    So what it needs for another short squeeze is only a positive NHTSA review, or this in combination with a better guidance the 4th of February. If these two news events happen close to each other the stock could easily reach $ 200
    26 Dec 2013, 03:07 PM Reply Like
  • markedtomarket
    , contributor
    Comments (29) | Send Message
    I think the underappreciated thing here is that they can make these fixes, including the previous one raising the high-speed cruising elevation by 1", via over-the-air software updates. That's incredible.
    26 Dec 2013, 03:37 PM Reply Like
  • surferbroadband
    , contributor
    Comments (5129) | Send Message
    More and more "problems" with the Model S are solved through software updates. Tesla is light years ahead of the competition. Can other vehicles solve issues through a software update?


    Major selling point for a Tesla vehicle.


    This is something that Tesla has had for a while and now is reaping the benefits, that is "cost savings".
    26 Dec 2013, 03:40 PM Reply Like
  • JRP3
    , contributor
    Comments (10429) | Send Message
    In fact, this was not even a "problem" in the Model S, Tesla has introduced a "fix" for poor house wiring, which is not really their responsibility.
    27 Dec 2013, 10:34 AM Reply Like
  • Miro Kefurt
    , contributor
    Comments (865) | Send Message
    25% power reduction is also at least 25% increase in charge duration which is long enough as it is, so off to a supercharger we go !?


    Still as long as there are houses with 30+ year old wiring that is not updated at $$$ then there will be "problems".


    Current through any resistance is HEAT, and there is no such thing as a ZERO resistance connection.


    There are more that few reports in the TESLA club files about the into vehicle connector being too hot to touch while charging, even few IR camera images of that, that alone is a design problem the tiny pins and trying to pump 400 A through them at 300V - WOW


    The wires SHOULD be at least AWG Zero, but they are NOT !!!
    26 Dec 2013, 04:28 PM Reply Like
  • Dan Fichana
    , contributor
    Comments (1918) | Send Message
    It's only if it detects wild power swings. My home was built in the early 1970s and the power is very stable.
    The reduction only kicks in if there is a problem.


    Over night charging- 25% reduction, no big deal. Most people drive 40 miles or less per day. Let's triple that and say 120 miles , lets also say that they get 8 hours of home time (sleep eating shower, etc).
    120 mile/8 hrs = 15 miles per hour charge rate which would be fine,
    Tesla is charging at 26-28 on a regular 220/40.


    If you have wild swings in your house, you should really replace the wiring regardless. I had a few swings at my previous address, fried an extremely expensive computer. New wiring actually cost less than replacing the computer.


    Does the 220 V 40 A charger get hot? It gets warm, to the touch, but not hot. Am i concerned, nope, i measured the current and it is very stable. I measured the heat, its not THAT when charging ( my iphone battery actually gets hotter, as does my laptop).
    26 Dec 2013, 05:45 PM Reply Like
  • Raster
    , contributor
    Comments (803) | Send Message


    Let's not make this all a jumble of mush.


    You start out talking about home charging, and note that power and time to charge are inversely related. That is true, however drivers don't need to charge all night, so it's not an issue.


    Older house wiring is not an issue. Only the wiring from the service panel to the car is being used by the car. The rest of the house is unaffected.


    Yes, current through resistance is heat. Congratulations for stating a fundamental law of electricity. (And yes, there are zero resistance conductors, but not at room temperature.) Electricians properly size circuits all day, every day. It's what they do. It's their job.


    No, there are no Tesla club IR photos images of 400 Amp 300 Volts connections being too hot. Here, you are either completely confused, or intentionally misrepresented the difference between home charging and Tesla direct current Superchargers. But this works great for your agenda, because many of the good folks here are not that familiar with the technology of the car YET.


    Your last statement about wire gauge convinces me that you have no idea about what you are talking about.
    26 Dec 2013, 06:03 PM Reply Like
  • David at Imperial Beach
    , contributor
    Comments (4381) | Send Message
    I'm not an electrician, but I would call one in to revise my wiring if I noticed my receptacle getting too hot to touch. I trust Tesla engineers to know how much energy their own connector can handle. But they have no control over the home wiring.
    26 Dec 2013, 05:17 PM Reply Like
  • Raster
    , contributor
    Comments (803) | Send Message


    If the receptacle is getting too hot, it's probably loose contacts. But the entire house is not an issue. Only the circuit to the car. And that's easy for your electrician to address.


    The reality though is we plug dozens of things in a day and never give it a second thought. Walk around your house and count outlets. Usually one about every 10 feet. Then switches. Lights. Now things like dryers, ovens, lights, radios, stereos, cell phones, computers. I think if you do the count, you'll be surprised that the number in a home is over 100. (I just counted 22 electrical devices in my living room right now.)


    Electricity is the safest, most widely adopted means of moving energy from place to place. It's so safe and so ubiquitous we are almost unaware of it. Miro enjoys spreading fear, uncertainty, and doubt. Pay him no mind.
    26 Dec 2013, 06:17 PM Reply Like
  • 123man
    , contributor
    Comments (1624) | Send Message
    This is exactly correct - when I first got my Model S I set up a 50amp plug off a 125 amp sub panel, and the plug got hot, as did the panel, and there were some sizzling sounds, so I reduced to 30 draw using the cars technology and the problem subsided - I then installed the HPWC (from different primary source) and now 100amps is no problem - BUT my wife kept hearing the sizzling sounds coming from the sub panel in the pantry - after investigation it turn out that the buss bars were so worn that the contact with even the lower amped breakers sizzled some - so, the solution was to replace the sub panel buss bar assembly - The Model S helped bring the problem to our attention - and now no more issues -
    27 Dec 2013, 11:00 AM Reply Like
  • Joe E Coyotee
    , contributor
    Comments (266) | Send Message
    @123 All you need now is some Solar Panels put on your roof .
    28 Dec 2013, 11:01 PM Reply Like
  • SharkDude
    , contributor
    Comments (766) | Send Message
    Well then go out and add another billion in mkt cap tomorrow. Maybe twitter will hit 90 too!!!
    26 Dec 2013, 08:34 PM Reply Like
    , contributor
    Comments (42) | Send Message
    Here on Florida's Treasure Coast my voltage swings from 224 - no load in the day to 254 at night - no load so it is not the house wiring.
    The local investor owned Utility does not want to spend the money to add more Voltage Regulators to control the voltage on THEIR GRID.
    After all it's the Customers Equipment that burns up & fails not theirs .
    26 Dec 2013, 08:38 PM Reply Like
  • surferbroadband
    , contributor
    Comments (5129) | Send Message
    Do I get to do the last comment.


    Miro, you are in the Petroleum Industry and doing a poor job of spreading FUD.


    Yes your business ( ) will be out of business in 15-20 years.


    The Electric car needs no oil changes, no oil filters, no transmission fuild, no gear oil, and no antifreeze. Five products that you will have declining sales in the years to come.


    I feel sorry for you. And you were trying to sell Yugo's back in the 80's. Poor thing.
    27 Dec 2013, 02:42 AM Reply Like
  • inquirebot
    , contributor
    Comments (9) | Send Message
    The differential contains some type of gear oil or transmission fluid. I cannot find info on the service interval.
    30 Dec 2013, 02:11 PM Reply Like
  • inquirebot
    , contributor
    Comments (9) | Send Message
    Tesla Model S is said to contain 10-12 times as much antifreeze as an ICE car, replaced every 4 years/48K miles.
    30 Dec 2013, 08:11 PM Reply Like
  • herb newman
    , contributor
    Comments (101) | Send Message
    Where are you John Peterson just when we need you to put down Tesla and battery technology?
    you joined us and given up on big OIL?
    27 Dec 2013, 04:35 PM Reply Like
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