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250KW. JFC! That's enough to power 100 average houses, all going into one car. I'm both impressed and slightly terrified.
by dreamcompiler 8y ago
250KW. JFC! That's enough to power 100 average houses, all going into one car. I'm both impressed and slightly terrified.
- mixmastamyk 8y agoCan’t wait for 1.21 Jiggawatts.
- DonHopkins 8y agoI can't wait for the wireless charger that lives up to the name "Tesla".
- xxpor 8y agoPeople might find it slightly inconvenient when their keys get torn from their pants and watches ripped from their wrists every time they charge their car.
- DuskStar 8y agoIt's not really a Tesla until it rips out your pacemaker.
- db48x 8y agoTesla used electric fields, not magnetic ones, for his wireless power tests..
- DonHopkins 8y agoLast I heard, electric fields and magnetic fields were inextricably related. https://www.realclearscience.com/articles/2014/01/29/how_tesla_coils_work_108474.html https://www.realclearscience.com/articles/2014/01/29/how_tes... >The power of the Tesla coil lies in a process called electromagnetic induction, i.e., a changing magnetic field creates an electric potential that compels current to flow. Conversely, flowing electric current generates a magnetic field. When electricity flows through a wound up coil of wire, it generates a magnetic field that fills the area around the coil in a particular pattern, shown with lines below: [...] >Eventually so much charge has accumulated that it breaks down the electrical neutrality of the air in the middle of the spark gap. The circuit closes for a fleeting second and a huge amount of current blasts out of the capacitor and through the coils. This produces a very strong magnetic field in the primary coil. Which leads us to ask: Fucking magnets: How do they work? https://www.youtube.com/watch?v=_-agl0pOQfs https://www.youtube.com/watch?v=_-agl0pOQfs
- db48x 8y agoThat's true enough, but a large electric field can wirelessly power a fluorescent light bulb, without moving your key ring at all.
- enraged_camel 8y agoSo a “Tesla coil”? ;)
- Carioca 8y agoHave you ever considered how much chemical energy is flowing through the gas pump when you fill up a car?
- Carioca 8y agoI got curious and did the math: US gas pumps do 10 gallons per minute, which give us 0.61 L/s. Density is about 0.7kg/L, energy content is about 46.7 MJ/kg. Multiplying the three we get juuust under 20MJ/s or 20MW or about 80 times more energy than this kind of electric charger
- serialx 8y agoThe difference reminds me of the energy efficiency a EV has.
- kgwgk 8y agoIt should remind you mostly of how much longer does it takes to recharge rather than refill.
- fignews 8y agoI need a reminder because I never pay attention to how long it takes. It’s just full every morning. A total paradigm shift from the old way of having to go somewhere to refill your car.
- deleted 8y ago[deleted]
- kumarvvr 8y agoWhoa. That is a lot of efficiency with EVs. But then, that electricity, when coming from a coal powered plant means that the overall "earth to wheels" energy efficiency is somewhere around 30%.
- 8y ago
- xxpor 8y agoThat's "only" 335.5 horsepower, to put it in car terms.
- burfog 8y agoAt 250 volts, it is only 1000 Amps. Normal houses come with 200 Amp service. Older ones may be 100 Amp, and larger modern ones are 400 Amp. So that is about 5 houses. You could buy that service. I hope Tesla would sell you the supercharger for it.
- caf 8y ago250KVA is a common rating for a moderately sized distribution substation. The utility certainly doesn't put only 5 houses on one - more like 50.
- burfog 8y agoAh, just like internet service: it is oversubscribed. The utility can not deliver what has been promised for all customers at the same time.
- bonzini 8y agoWhich would be a problem when everyone gets an electric car and every night the owners will request 20 kW for up to 8 hours (hence sustained, not peak). For a condo that could easily be half a megawatt.
- jerven 8y agoThat is an unreasonable number. That is 160 kwh of power which is double the largest model 3 battery. This would require everyone to drive nearly 600 miles a day at highway speed. Roughly nine hours of driving a day at 75miles an hour. The expectation is that people drive 30ish miles a day. This is about 11kwh. Over 8 hours a night, well within reasonable limits.
- bonzini 8y agoI was thinking of 10 kW * 2 cars, but actually even for a single car you need 120 kWh to charge 85 kWh. You're right that it won't happen every night for 8 hours, I was wrong about that. Problem is that you have to size for the worst case, which may happen only once a year, but it will happen. Everyone coming back after Thanksgiving. Everyone reaching a vacation place on a Sunday evening in the summer. Bam, 20 kW sustained for a few hours. It takes only a few big condos before you need to bring 400 kV lines downtown...