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  1. Charging w/ house electrical issue

    I cannot imagine what sort of miswiring would lead to an event like that. I'm not sure what you mean here. A panel can usually be (and often is) fed with aluminum wire (though some jurisdictions forbid it) and I think sub panels can be fed with it too, but branch circuits have to be copper and...
  2. Battery Progress

    Apparently someone misinterpreted my post as saying it’s OK to leave a battery at 0%. It doesn’t say that at all. It is my policy to stay out of the bottom 20% if possible.
  3. Battery Progress

    Very important that people understand that leaving a battery at 0% may not damage it at all (e.g 0% set for 3.0V) whereas letting it sit at 0 V will most probably destroy it.
  4. Does wall charger need to be plugged back in after use?

    HPWC in use. Located so as to keep cable off floor: Same HPWC with wand stowed in internal "socket". No electrical connection: WallBox Pulsar stowed. No internal socket:
  5. Why does battery tech take so long to make? (example: 4680)

    I don't know anything about the baking industry but I do know something about brewing. It takes a brewery years to develop a new beer worthy of being included in its portfolio. In the brewing industry there is plenty of tasting along the way (that's why the fermenters and lagering tanks have...
  6. Battery Progress

    It's terrible as you might expect understanding what it is. It is the car's estimate of what is left in the battery relative to the 0 mark divided by the rated consumption. How accurate it is depends on haw closely you match rated consumption in the future and actual consumption can vary quite a...
  7. Battery Progress

    These batteries store energy by using it to pump lithium ions from the cathode to the anode. Another way of storing this energy would be to pump water from one bucket to another at a higher level. Over time some of the water will evaporate and you will be able to store less energy. In the...
  8. Does wall charger need to be plugged back in after use?

    Have to agree with that. Keeping the cable off the floor is a plus for certain.
  9. Does wall charger need to be plugged back in after use?

    I suppose the answer will depend on the wall "charger" make and model but none that I have seen make any electrical connection between the charging wand and the "holster". The holster is a purely mechanical holder for the wand. Thus it makes no difference whether the wand is in the holster, on...
  10. Graph of amperage draw over time for Model S and Tesla wall charger?

    I should add that you can change the charging rate (current) during a charge session in which case the answer is broadened to say that the plot follows your rate requests throughout the charge. Desired rate can be set in either in the car or via the app. Per the discussions here you will...
  11. Graph of amperage draw over time for Model S and Tesla wall charger?

    I found a spec sheet for a 2170 cell with capacity 4 Ah and average operating voltage of 3.65V. At this voltage it stores 14.6 Wh and one wold need, therefore around 13,700 of them for a 200 kWh battery with the actual number dependent of what values of P and S work out to be. The internal...
  12. Graph of amperage draw over time for Model S and Tesla wall charger?

    We can WAG it. At 240V 30A is 7.2 kW. 90% charging efficiency means that 6.48 kW is delivered to the battery and in 8 hr it would receive 51.8 kWh. Deduct 2kWh phantom drain from that to get around 50 kWh. Since this is a TriMotor its battery is going to be about 200 kWh meaning this 50 kWh...
  13. What Wall Charger to Buy???

    In non equation form a linear dependence between x and y would be expressed as something like "y depends on the first power of x multiplied by a constant plus another constant." But no one would say that. They'd simply say "y is linear in x" or "y is a linear function of x". People who paid...
  14. What Wall Charger to Buy???

    I would be happy to except that I didn't write any formulas. You show me a formula that can be graphed and I'll happily graph it for you but there simply aren't any formulas in these posts! Just so you know what a formula looks like y = m*x + b would be one. A graphable formula has a...
  15. What Wall Charger to Buy???

    Referring to the first quote: How do you graph a curve as a straight line? Referring to the second quote graphing 5C, C/5, 2C and C/2 would result in sets of 4 points parametric in C. How do you get a razor line out of that? I've been dealing with linear equations since high-school and I've...
  16. What Wall Charger to Buy???

    But I never said anything about a linear formula. Can you please tell me where you think I did?
  17. What Wall Charger to Buy???

    You must have some very strange notion as to what "linear" means.
  18. What Wall Charger to Buy???

    We aren't talking about charging cars. We are talking about the things that effect battery longevity and proposing gedanken experiments to give us insight. I'm afraid we are discoursing on very different planes. Don't know what you are talking about here. In a test protocol the current would be...
  19. What Wall Charger to Buy???

    Call it what you will. The intelligent individual will respond to the question by saying to himself "Of course not - but those charge/discharge rates are absurd." But he will also understand where the instructor is going and, we hope, ask himself "Well how about 5C and C/5 or 2C and C/2?"
  20. What Wall Charger to Buy???

    Well yes there are standards for example the IEC standard I mentioned in my last post but they aren't often (that I have seen) referred to. For example when Tesla promises the "million mile battery" they don't put in the footnotes that it's that with respect to IEC - xyZ45 Rev.B. This is why, as...


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