I think that Tesla's proposal for pack swapping ties into this - They will have their fast charging stations equipped with battery storage (either the Tesla packs themselves that they cycle or separate dump pack) that will allow the peak draw to be spread out over time, so that all solar can be captured as well as that a peak 5 MW delivery does not require a 5 MW grid connection, but less than 2 MW connection. At a typical 22 kV mid-voltage (the type that runs through your backyard if you are living in a place with "pole pig" supply) this power level means less than 100A of current, which is a rather trivial amount for a utility.
Cor van de Water Chief Scientist Proxim Wireless Corporation http://www.proxim.com Email: [email protected] Private: http://www.cvandewater.info Skype: cor_van_de_water Tel: +1 408 383 7626 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Ed Blackmond Sent: Monday, July 22, 2013 1:33 PM To: Electric Vehicle Discussion List Subject: Re: [EVDL] EVLN: Tesla Aims to Charge their EVs in Five Minutes On Mon, 22 Jul 2013, Gary Neal wrote: > 85,000 Whr * 60 (mins/hour) / 5 mins = 1 MW, not 60 MW. On Mon, 22 Jul 2013, Cor van de Water wrote: > I think you are trying to charge in 5 seconds, not 5 mins, according your power calculation ;-) > 5 min is 1/12 hour, so if you would be able to recharge from 0 to 100% > and deliver 85kWh in 5 min, it would take 12 x 85kW = 1 MW. Yes, my original math was done in too much haste. It is still quite a bit of power. Even at 10 minutes and 80% charge, 400KW is quite a bit of power. There may not be much loss in the cables, but they will be quite heavy. The connectors on the other hand will require a huge surface area, tight clamping, and some sort of active cooling. A lot of solar panels and batteries are going to be required to be able to assist the utility to deliver this power. Especially if it is supposed to work like todays gasoline refueling stations with multiple vehicles recharging at once. Ed _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA) _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
