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With less than zero to add to this conversation I'll simply pose a question:
Based on what I can understand here (Sorry, MBA not EE) I decipher that there is a lot of "conservative" work being done by Tesla. (battery at 0% is really at 8-10%, etc) So my question is - is there anything in this programming that could lead to increased performance? Is there a market for "tuning" Teslas, either by increasing regen for "hypermilers" or putting more torque to the motors at launch, etc?
Great thread - the best on TMC. I'll go back to contributing in the "I saw a Model X today" threads and continue to follow this one with my mind spinning. By the way - more graphs and pictures for us who prefer to think we know what you are talking about. Thanks!
Tesla is probably using the "typical" capacity at 25°C from the spec sheet: 3.35Ah x 3.6V x 7104 = 85.674 kWh.
Before anyone jumps on me about this, I'll point out that Tesla has stated that the pack capacities are stated at the beginning of life. If they follow the degradation curve from the NCR18650B (they're not exactly the same cells) then they would start with about 84 kWh on day 1 of life, and drop to the 81 kWh area around 50 cycles. However, these cells are not NCR18650B, since their cycle capacity loss curve is totally different. But anyway, 50 cycles worth of degradation would be at least ~10k miles of driving. I know the first pack my loose cells are from had less than 2000 miles, or less than 10 cycles. I have CAN logs from others who have 85's with < 5000 miles and are still showing the same capacity caps. So, *shrugs*. Anyway, using the NCR18650B rating of 3.2Ah @ 3.6V gives us 81.8kWh.
Tesla is probably using the "typical" capacity at 25°C from the spec sheet: 3.35Ah x 3.6V x 7104 = 85.674 kWh.
wk, I assume you've looked into what capabilities are available via the USB ports. What does Tesla do to ensure that you can't use those ports for anything other than playing music?
Jason, would there be any value to your efforts to having data from an older MS - VIN P11xxx, with 73k miles on it?
I'd be happy to contribute what I can.
I think I said this on page 1 or 2, but I will say it again. Thanks WK and others who are contributing.
@wk, is there any way you can get the audio chimes off the car to enable/disable autopilot. They would make for perfect iPhone notifications sounds!!
...or are they proprietary? I don't want you breaking any rules!
Based on my testing of individual cells from my solar project, and based on the BMS data, I've concluded that the Tesla "85" kWh pack is actually about 81 kWh...
Certainly! If you were able to get CAN3 logs from your car doing random things like driving/charging/etc I could use that to verify my findings are compatible. I've already found some differences between my P85D and my wife's P85, so the more data the better!
So a quick look around (Model S Specifications | Tesla Motors and many other pages) indicated that Tesla no longer has ANY horsepower numbers on their site.
So yes, please start a real "how big are the batteries" thread and let's see if we can get Tesla to stop claiming that their cars have 85kWh batteries.
The Tesla Model S P85D. 85kWh battery(1), 691hp(2), with hands free on-ramp to off-ramp driving(3) and a navigation system that ends range anxiety(4)!
(1) of which 77kWh are usable
(2) of which up to 463hp are usable at any time
(3) as long as your hands are on the steering wheel at all times
(4) because it annoys you so much with idiotic routing, outdated maps and missing features that you forget to worry about range
I just need this right? EVTV Motor Verks Store: SavvyCAN for Tesla Model S, CAN Tools, TeslaCANKit
Then which software would be preferable for data logging for you?
I'd prefer to go for a "common" solution, as it will be easier to get help from fellow users.
BUT The problem I'm facing is US->UK shipping charges. It almost doubles the price on some of them
Has anyone any experience with the Kvaser Leaf Light, as this seems more easily available in the EU.
Open to any other suggestions ? (please feel free to PM me if this is getting too commercial.)
Diagnostic screen on a salvage car. I think this was around FW 4.5 timeframe.qwk: How did you figure out 4.15/4.16? Last time i checked the BMS and battery banks of my old S85 at 100% SOC it clearly said 4.2V.
There is a capacity remaining in kwh, and a state of charge in % under DATA>Basic.So BMS_nominal_Fullpackenergy is something like 77 kWh on an 85? Is there any parameter that allows one to view 100% of the energy that the pack is capable of storing? Including bricking protection buffers and whatnot? What is this value (approximately) on an 85 kWh?
I couldn't make sense of the numbers. Even with a balanced pack, they don't add up. I would say that Wk is right, and that 85kwh really means 81kwh....Sure, but I'm assuming that number would scale to ~77 kWh, not 82 or 85 kwh.