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    So how long before you lose your flashlight?

    About the same for me. Actually, I think there is another one in the passenger side door so you have a spare. And because of guys like us I am sure we will be able to buy replacements from the online store. As to duration I think it is going to be a long time as it uses one of the same cells...
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    BEV & Battery Wars: Rivian, SDI, GM, Chinese, S. Korean & Global Rivalry

    Clearly it would be better to take the less harmful path which, as the graphic in #32 clearly shows, is the electric one. In other words, the grid is actually environmentally friendly relative to the alternative when used as source energy for transportation. Clearly it could be even more...
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    BEV & Battery Wars: Rivian, SDI, GM, Chinese, S. Korean & Global Rivalry

    Why is upstate NY so good? Because they buy their electricity from Quebec Hydro.
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    Are we sure they can't fit 35 inch tires?

    If torque is limited (and it is) then less thrust and thus less acceleration is available with a larger wheel. Also the larger wheel has a larger rotational moment of inertia which means some loss of efficiency as regenerative energy recovery is not 100% efficient. Not sure that the magnitudes...
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    Bidirectional home chargers

    Using that info let's suppose that on average there is only 1 car charging at 125 kW hr but in one 15 min interval there were 4 so that the peak 15 min demand was 500 kW. Thus the demand charge would indeed be $1200, But this, you say, is assessed per billing cycle. If the average demand is 125...
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    Bidirectional home chargers

    I understand that some of you are only thinking of the two way feature for use in emergency situations. There are, IMO, other, better ways to cover those but the best reason I have found so far (no math involved) in on p 175 of the X owners manual; "Caution: Do not use the Battery as a...
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    Bidirectional home chargers

    I should have added last night the reason I think round trip current is the culprit. When you charge a battery at any level you suck electrons out of the cathode and transfer them onto the anode resulting in the anode becoming more negatively charged and the cathode more positively charged. This...
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    Bidirectional home chargers

    There are certainly some ways to discharge and charge batteries that are better than others but I expect that there is a rather high correlation between chemical total round trip current. FWIW Tesla's current recommendations are to use Super Chargers only when there is no alternative...
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    Bidirectional home chargers

    It is not at all difficult to pass power from a DC source (such as a BEV battery) to the grid. In fact I have 58 little boxes on my roof that do just that. The power interface is a couple of transistors and a wee transformer. The challenge is in coming to terms with the utility on how much power...
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    BEV & Battery Wars: Rivian, SDI, GM, Chinese, S. Korean & Global Rivalry

    Yes, too bad because "fool cells" as Elon calls them are pretty neat technology but just not practical for cars and small trucks. The only place I see them is in industrial settings (truck depot, taxi dispatch centre, power generation facility) adjacent to a windfarm or solar plant with excess...
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    BEV & Battery Wars: Rivian, SDI, GM, Chinese, S. Korean & Global Rivalry

    I certainly hadn't intended to kick off a contest of personality cults with this remark. It was intended to point out just another example of sloppy journalism - the writer contradicting himself in his own article unless we are suggesting that the batteries being used in the 3 are not in fact...
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    What we might see in that configurator: Options, Launch Edition, etc...

    I'd add one feature to this and I know it's silly but I'd like to have it and that is to be able to isolate the solar system so that its entire output goes to the Rivian whenever the Rivian demands power for charging. You do not want to be pulling power from the Rivian unless it is absolutely...
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    What we might see in that configurator: Options, Launch Edition, etc...

    Your solar system needs a battery to run when the grid is down, at least with the current microinverters. The next generation will not, apparently, but even so there isn't much point in having a solar system to cover outages unless you have batteries. Your truck could be that battery but you...
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    BEV & Battery Wars: Rivian, SDI, GM, Chinese, S. Korean & Global Rivalry

    The article headline is about a breakthrough to new low level of cobalt. Then way down the page we find "In a 2018 call with Wall Street analysts, Musk said that Model 3 cobalt content in its NCA battery was already lower than anyone would achieve in future deployment of NMC 811." So this brand...
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    What we might see in that configurator: Options, Launch Edition, etc...

    Everyone's requirements, desirements and perceptions are his own. Power outages around here are lots less frequent now that I've installed backup. I want the backup but I also want a full tank of energy in my car thus I would not consider the car as a source for backup power. Don't believe what...
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    What we might see in that configurator: Options, Launch Edition, etc...

    Interesting. Most of us want to prolong the life of the battery.
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    Economic Reasons to Buy an EV instead of a gas powered car

    Your decision is going to turn on what the two words I've bolded means. There will, of course, be people for whom this refueling time is intolerable. They shouldn't buy BEVs. But for the vast majority who use the vehicles more or less conventionally (commuting and a couple of longish trip a...
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    Economic Reasons to Buy an EV instead of a gas powered car

    Most Teslas that need service are sitting in their owners' garages waiting for a Ranger to come by and fix them. Annual maintenance, if you bother with it at all, consists or rotating the tires, checking the windshield washer fluid level, replacing the winshoeld wiper blades and putting a new...
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    what is the voltage system for the Rivian compared to Tesla?

    The battery packs are made up of a number of cells. Consider the simplest case of 2 cells of V volts each. You can put them in parallel and apply voltage V across the pair which, if it forces I amps through each will result in I*V watts being delivered to each cell for a total charge of 2*I*V...
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