Comments for MIT Electric Car Claims 10 Minute Charge Time at http://www.ecogeek.org , comment 1 to 13 out of 13 comments http://www.ecogeek.org Sun, 08 Nov 2009 04:47:29 +0100 FeedCreator 1.7.3 http://www.ecogeek.org/automobiles/2875-mit-electric-car-claims-10-minute-charge-time#comment-29167 Batteries have internal resistence which creates heat when charged and/or discharged (impedance). They are like a slow burning fuse. The faster you charge/discharge them the faster they burn out. Yes you can charge a Li-ion battery in 10 minutes. Do that enough and you shorten its life very significantly. - Einstein Thu, 06 Aug 2009 18:31:44 +0100 http://www.ecogeek.org/automobiles/2875-mit-electric-car-claims-10-minute-charge-time#comment-29150 10 minutes? Really? I don't charge my 24V, 4.5A laptop in 10 minutes right now. - Kimi Thu, 06 Aug 2009 13:42:30 +0100 http://www.ecogeek.org/automobiles/2875-mit-electric-car-claims-10-minute-charge-time#comment-28968 Well, in the previous post we see an example of Bob's brain pre-coffee. The MIT car's $80k battery price obviously didn't come from the "cost of hand wiring" as lab rats come free. The cost comes because a product meant for use was adapted for another. It says nothing about what it would cost to make batteries for a similar car were they to be designed for the purpose and manufactured large scale. - Bob Wallace Thu, 30 Jul 2009 13:48:23 +0100 http://www.ecogeek.org/automobiles/2875-mit-electric-car-claims-10-minute-charge-time#comment-28963 Akos - And the cost of hand wiring 7,905 of them together? This is a prototype. One cannot make any predictions of future price based on a prototype. Yes, they used some off the shelf parts, but they had to assemble them in a non-standard manner. Did you pay attention to what it cost to manufacture each GM EV1? - Bob Wallace Thu, 30 Jul 2009 11:59:14 +0100 http://www.ecogeek.org/automobiles/2875-mit-electric-car-claims-10-minute-charge-time#comment-28958 Bob! Batteries and chargers are already in super mass-production. They used Lithium based batteries, 7,905 pieces of them, right from your mobile phone's spare part catalogue. - Akos3D Thu, 30 Jul 2009 08:35:25 +0100 http://www.ecogeek.org/automobiles/2875-mit-electric-car-claims-10-minute-charge-time#comment-28951 Well, I'm not writing you a letter of recommendation to the economics department.... Prototype prices have little to do with the price of something once it goes into mass production. Even early release prices don't foretell where prices will stabilize. Remember, the first simple electronic calculator sold for about $700 in 'back then' dollars. Now they sell for, well, about nothing.... - Bob Wallace Wed, 29 Jul 2009 19:05:03 +0100 http://www.ecogeek.org/automobiles/2875-mit-electric-car-claims-10-minute-charge-time#comment-28938 Well, I got confused here (and don't even mention the problems with US people loving e-car story way over its importance...) First the article tells us that MIT guys (pre-engineers) have used up 80k$ for putting battery bank into a car, that charges in ten minutes. Then it says the charger also would cost a fortune (not to mention conversion costs). This makes a super inefficient and financially super irrelevant try from these students. Then asks for GM and others to higher these "best and brightest engineers" for designing future EV cars. I just hope GM and others DO NOT employ THESE guys. - Akos3D Wed, 29 Jul 2009 07:14:42 +0100 http://www.ecogeek.org/automobiles/2875-mit-electric-car-claims-10-minute-charge-time#comment-28937 W = Power (rate of energy) Wh = Energy 350KWh charge in 10 minutes --> requires more than 2MW power supply. If the power supply is 100% efficient (impossible) and operates at European household voltages a.k.a. 220V then it would require a 9000 Amp cable (the size of a tree trunk). If it operates at 2400V voltage then it would require an 800+ Amp cable. Good luck. - hyperspaced Wed, 29 Jul 2009 05:29:26 +0100 http://www.ecogeek.org/automobiles/2875-mit-electric-car-claims-10-minute-charge-time#comment-28936 [i]"GM, and all the other car companies who want to build EVs for real should take note, and make sure to hire the best and brightest engineers."[/i] Why doesn't Gm just rehire the EV1 team they sacked in 2003? Just thinking about the EV1-genocide GM did makes me angry again >:( - Bouke timbermont Wed, 29 Jul 2009 05:24:53 +0100 http://www.ecogeek.org/automobiles/2875-mit-electric-car-claims-10-minute-charge-time#comment-28933 There are alot of great things going on in the world of e-mobility. In order to see that it stays that way, communications should be credible. I hope someone does a quick math reality check here soon. - cbd Wed, 29 Jul 2009 03:26:54 +0100 http://www.ecogeek.org/automobiles/2875-mit-electric-car-claims-10-minute-charge-time#comment-28924 That's not the first time ecogeek has confused kW and kWh. This is basic physics, guys. The watt (W) is a rate of energy transfer, one joule per second. A watt-hour (Wh) is the quantity of energy which would flow during one hour at the constant rate of one watt. Convert hours to seconds and multiply, you get 1Wh = 3600J. When talking about electric cars, kW is describing how quickly energy can get into or out of the batteries while kWh is describing how much energy can be stored in total. - TB Tue, 28 Jul 2009 16:38:48 +0100 http://www.ecogeek.org/automobiles/2875-mit-electric-car-claims-10-minute-charge-time#comment-28910 It's not a 350 kW-HOUR pack, it takes 350 kW to recharge it! (Check the source page this article links to.) If the car went only 200 miles on a 350 kWh charge (about one tenth the miles/kWh one would expect), at 10 cents/kWh it would cost over 17 cents/mile just for the electrons. - Lou Grinzo Tue, 28 Jul 2009 14:11:13 +0100 http://www.ecogeek.org/automobiles/2875-mit-electric-car-claims-10-minute-charge-time#comment-28907 What would help this story a lot is more info on the batteries, especially the cost. Is the $80k due to an economy of scale issue? Would the price drastically fall were these batteries to be build in huge numbers? Or are these batteries built out of non-obtainium? - Bob Wallace Tue, 28 Jul 2009 11:59:39 +0100