Comments on: Jay Leno's New Show Will Put Guests In An Electric Car http://gas2.org/2009/09/10/jay-lenos-new-show-will-put-guests-in-an-electric-car/ What is the future of fuel? What's new? What's next? Since 2007, Gas 2 has covered a rapidly changing world coming to terms with its oil addiction. Sun, 12 Feb 2012 21:57:52 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: JohnS http://gas2.org/2009/09/10/jay-lenos-new-show-will-put-guests-in-an-electric-car/#comment-12239 JohnS Sat, 12 Sep 2009 08:20:32 +0000 http://gas2.org/?p=3440#comment-12239 Reflecting further on my previous comment, the significance of this observation is that it implies that in practice the charging time for an EV battery is limited by the power available at the socket, not by the battery technology. We read from time to time about new rapid charge batteries, but the Ford BEV design, if correctly reported, would seem to be limited by the power available to the charger, which varies according to local voltage and wiring standards, rather than the battery. Otherwise, the 110V charger would simply draw twice as much current and charge in the same time, but presumably it can’t do this without exceeding the typical circuit amperage capacity. So, we don’t need amazing new batteries so much as we need beefed up wiring to our garages. Interesting. Reflecting further on my previous comment, the significance of this observation is that it implies that in practice the charging time for an EV battery is limited by the power available at the socket, not by the battery technology. We read from time to time about new rapid charge batteries, but the Ford BEV design, if correctly reported, would seem to be limited by the power available to the charger, which varies according to local voltage and wiring standards, rather than the battery. Otherwise, the 110V charger would simply draw twice as much current and charge in the same time, but presumably it can’t do this without exceeding the typical circuit amperage capacity. So, we don’t need amazing new batteries so much as we need beefed up wiring to our garages. Interesting.

]]> By: JohnS http://gas2.org/2009/09/10/jay-lenos-new-show-will-put-guests-in-an-electric-car/#comment-35536 JohnS Sat, 12 Sep 2009 08:20:00 +0000 http://gas2.org/?p=3440#comment-35536 Reflecting further on my previous comment, the significance of this observation is that it implies that in practice the charging time for an EV battery is limited by the power available at the socket, not by the battery technology. We read from time to time about new rapid charge batteries, but the Ford BEV design, if correctly reported, would seem to be limited by the power available to the charger, which varies according to local voltage and wiring standards, rather than the battery. Otherwise, the 110V charger would simply draw twice as much current and charge in the same time, but presumably it can’t do this without exceeding the typical circuit amperage capacity. So, we don’t need amazing new batteries so much as we need beefed up wiring to our garages. Interesting. Reflecting further on my previous comment, the significance of this observation is that it implies that in practice the charging time for an EV battery is limited by the power available at the socket, not by the battery technology. We read from time to time about new rapid charge batteries, but the Ford BEV design, if correctly reported, would seem to be limited by the power available to the charger, which varies according to local voltage and wiring standards, rather than the battery. Otherwise, the 110V charger would simply draw twice as much current and charge in the same time, but presumably it can’t do this without exceeding the typical circuit amperage capacity. So, we don’t need amazing new batteries so much as we need beefed up wiring to our garages. Interesting.

]]> By: JohnS http://gas2.org/2009/09/10/jay-lenos-new-show-will-put-guests-in-an-electric-car/#comment-12238 JohnS Fri, 11 Sep 2009 09:03:57 +0000 http://gas2.org/?p=3440#comment-12238 ChuckL – Would you like to explain why you think the charging time is quartered when the mains voltage is doubled? By my calculation, energy = voltage x current x time. So doubling the voltage the halves the time to provide the same energy to the battery. Are you thinking that the battery is a simple resistive load? It’s not. Any differences in mains supply voltage will be handled by the power conversion circuit on the front end of the charger. ChuckL – Would you like to explain why you think the charging time is quartered when the mains voltage is doubled?

By my calculation, energy = voltage x current x time.

So doubling the voltage the halves the time to provide the same energy to the battery.

Are you thinking that the battery is a simple resistive load? It’s not. Any differences in mains supply voltage will be handled by the power conversion circuit on the front end of the charger.

]]> By: JohnS http://gas2.org/2009/09/10/jay-lenos-new-show-will-put-guests-in-an-electric-car/#comment-35534 JohnS Fri, 11 Sep 2009 09:03:00 +0000 http://gas2.org/?p=3440#comment-35534 ChuckL – Would you like to explain why you think the charging time is quartered when the mains voltage is doubled? By my calculation, energy = voltage x current x time. So doubling the voltage the halves the time to provide the same energy to the battery. Are you thinking that the battery is a simple resistive load? It’s not. Any differences in mains supply voltage will be handled by the power conversion circuit on the front end of the charger. ChuckL – Would you like to explain why you think the charging time is quartered when the mains voltage is doubled?

By my calculation, energy = voltage x current x time.

So doubling the voltage the halves the time to provide the same energy to the battery.

Are you thinking that the battery is a simple resistive load? It’s not. Any differences in mains supply voltage will be handled by the power conversion circuit on the front end of the charger.

]]> By: JohnS http://gas2.org/2009/09/10/jay-lenos-new-show-will-put-guests-in-an-electric-car/#comment-35535 JohnS Fri, 11 Sep 2009 09:03:00 +0000 http://gas2.org/?p=3440#comment-35535 ChuckL – Would you like to explain why you think the charging time is quartered when the mains voltage is doubled? By my calculation, energy = voltage x current x time. So doubling the voltage the halves the time to provide the same energy to the battery. Are you thinking that the battery is a simple resistive load? It’s not. Any differences in mains supply voltage will be handled by the power conversion circuit on the front end of the charger. ChuckL – Would you like to explain why you think the charging time is quartered when the mains voltage is doubled?

By my calculation, energy = voltage x current x time.

So doubling the voltage the halves the time to provide the same energy to the battery.

Are you thinking that the battery is a simple resistive load? It’s not. Any differences in mains supply voltage will be handled by the power conversion circuit on the front end of the charger.

]]> By: ChuckL http://gas2.org/2009/09/10/jay-lenos-new-show-will-put-guests-in-an-electric-car/#comment-12237 ChuckL Fri, 11 Sep 2009 02:19:13 +0000 http://gas2.org/?p=3440#comment-12237 What's the problem with the charging system. If it charges in 12 hours on 110V, then it should only take 3 hours on 220V. What’s the problem with the charging system. If it charges in 12 hours on 110V, then it should only take 3 hours on 220V.

]]> By: ChuckL http://gas2.org/2009/09/10/jay-lenos-new-show-will-put-guests-in-an-electric-car/#comment-35533 ChuckL Fri, 11 Sep 2009 02:19:00 +0000 http://gas2.org/?p=3440#comment-35533 What's the problem with the charging system. If it charges in 12 hours on 110V, then it should only take 3 hours on 220V. What’s the problem with the charging system. If it charges in 12 hours on 110V, then it should only take 3 hours on 220V.

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