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  1. What Wall Charger to Buy???

    That's really good news because the batteries in my Powerwalls never go below 80% and thus never complete a cycle meaning that they will never reach their rated cycle spec and never need to be replaced! But clearly that's not the case. After 10 years they will hold appreciably less charge than...
  2. What Wall Charger to Buy???

    It just occurred to me that an important aspect of the answer to that question is Tesla's new policy of NOT including a UMC with its vehicles any more so that if you don't have EVSE set up at home you will not be able to charge at home from any outlet in you house be it 120 or 240. Keep this in...
  3. What Wall Charger to Buy???

    I would hardly call it "solid" but the specifications for the UMC indicate the number of miles added per hour of charging and the current drawn from each of the UMC configurations. These numbers suggest that the 120V configuration would require 25% more power. It's relatively easy to measure...
  4. What Wall Charger to Buy???

    I know your time is valuable but we don't want all this wrong information staying out there so again I ask you to pick just ONE thing that is incorrect and see if we can't correct it. We'll work them off one at a time.
  5. What Wall Charger to Buy???

    The amount of energy required to raise the temperature of a mass from T1 -> T2 is the difference between those temperatures (in K) multiplied by the thermal mass of the object whether it be from a high power or low power source. Whichever it is the same amount is required of the charger as...
  6. What Wall Charger to Buy???

    So if I am in the car charging from a 120V outlet and turn on the radio and the heater those loads become part of charging overhead? I'm having a little trouble with it but let's go with it for now. You would further assert that this higher "charging overhead" would result in a higher electric...
  7. What Wall Charger to Buy???

    Well of course I'd like to think I have the scientist's perspective; my colleagues always said I did even though I was supposed to be an engineer. But give me an opportunity to play games with the English language and I'll do it!
  8. What Wall Charger to Buy???

    Yes, i believe it is true. Heat isn't the only way battery life is shortened. Ion interaction with the SEI is another. I am just looking at an articles describing a new battery claiming X cycles lifetime at a slow charge rate and Y < X at a faster one as verified at an independent testing...
  9. What Wall Charger to Buy???

    I certainly have no complaints (but then I haven't done bigger than 9 x 9). These trucks don't seem to be getting any smaller. I guess the thing I like best about the new ones is their amazingly high R factors. 9 x 9 is a lot of square feet but its amazing how little heat goes through that 81 ft^2.
  10. What Wall Charger to Buy???

    You are right. I did not see the post (nor do I see ones from Ogre)??? I very seldom, if ever, ignore anyone and on the rare occasions I did so there used to be a flag indicating that that person had posted and the option to see the post was presented. That feature seems to be gone. Anyway, no...
  11. What Wall Charger to Buy???

    I'm afraid your reasoning is, once again, a bit off base here. When charged at a very slow rate the current going to the battery is small. Heat dissipated in the battery is proportional to the battery internal impedance and to the square of the charging current. Thus you will never have lower...
  12. What Wall Charger to Buy???

    What is this in respose to? What's just not true? ] Me either. HPWC do not require neutral because they do not draw 0 sequence current.
  13. What Wall Charger to Buy???

    I find it most amusing that you say this because the paragraph from my post from which you took it conflicts directly with what you are saying here. It is not an established fact that you will use more electricity if charging at a slower rate because it simply isn't true. It may be true that the...
  14. What Wall Charger to Buy???

    I suppose that depends on one's definition of astronomical. The difference is in the wire. A 14-30 and 14-50 receptacle are going to cost nearly the same (as they are the same except for the ground pin) and a 50A breaker is typically about $4 more than a 30A breaker. 6 AWG THHN is $1.06/ft or so...
  15. What Wall Charger to Buy???

    "Average" has a very specific meaning. It is one measure of the central value of a set of numbers. There is no disagreement about this. It is clear from this thread, however, that some people do not know how to interpret it and indeed one cannot really interpret it without also having a measure...
  16. What Wall Charger to Buy???

    You are advertising that you don't understand how to interpret statistics. Please be aware that there are in fact people on this forum who do.
  17. What Wall Charger to Buy???

    Well I actually have a BS in electrical engineering and a MS too from a very good engineering school. How do you suppose I fooled my employers over all those years? Anyway, I extend the same challenge to you. Pick ONE thing that I have said here that is BS (and please pick something more...
  18. What Wall Charger to Buy???

    Let me suggest that you pick ONE thing that is wrong in my post and perhaps we can discuss that. The reason I respond to posts here at all is out of fear that newbies will come to believe some of the nonsense that gets posted in these forums so that they can make informed decisions. If we can...
  19. What Wall Charger to Buy???

    Not necessarily so. Every time my backup generator runs I regret that I bought a 48 kW sized unit when, as it turns out I could have gotten by with a much smaller unit. My reasoning on picking the larger unit was exactly what you propose. I do have loads bigger than 48 kW but they are rare and...
  20. What Wall Charger to Buy???

    Well, you see, that's the thing about it. People's mileages do vary. Some find Level 1 charging adequate. Most probably wouldn't. My personal experience, FWIW, is that I'll charge anywhere from 1 kW to 9.6 kW depending on circumstances and if I'm paying attention to it. In other cases I just...
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