David, Talk to the operator of a large plant with heavy electric draws, how they think about load leveling. I know of plants where they bought specialized equipment to sequence the different draws of startup of electric motors, just to reduce the peak draw as their bill was more determined by the maximum peak power that they would draw instantaneously during any time in a month, than the total electric consumption. Reason is simple: the power plant needed to have that much power "on tap" even though it was not used 99.999% of the time. So, starting different motors out of sequence and even turning some loads OFF deliberately just for the few seconds that the largest electric motors were starting, saved them big bucks, just from reducing their peaks. And a big heater or electrolyzer that is turned off for a few seconds makes no difference in the result of that process other than that it may take a few seconds longer for the end result, but there are immediate savings. And that was before battery storage was very common and efficient, today they may opt to start motors entirely from stored power. I think that fast charging with load leveling, whether by battery storage or by throttling all stations a little if all try to draw max at the same time, until one or more no longer takes max power and the majority of the power can flow to a fewer nr of stations, certainly makes sense to reduce both cost of the connection as well as pek power bill. Note that many fast charging stations today need a commercial power connection because the 100+ Amps at around 400VDC means over 40kW continuous so it is typically c connected at 480V. EMW has developed a battery backed fast charging ChadeMo station that can live off the 12kW available from an RV outlet (240V 50A) and I expect that just the savings in connection required (residential instead of commercial) makes up for the investment in the battery bank. Cor.
-----Original Message----- From: EV [mailto:ev-boun...@lists.evdl.org] On Behalf Of EVDL Administrator via EV Sent: Monday, November 20, 2017 10:05 AM To: Electric Vehicle Discussion List Cc: EVDL Administrator Subject: Re: [EVDL] EVLN: Fisker's 3D electrode li-ion promises 500Mi EV& 1min recharge On 20 Nov 2017 at 9:38, Cor van de Water via EV wrote: > In my book charging a 40kWh battery in 1/60th hour (one minute) to 80% > means 40 x 0.8 x 60 = 1920 kW, almost 2 Megawatt. Thanks, absolutely correct. I got unconscionably careless with my powers of 10. That shouldn't have passed the sniff test here. Sorry. For sure, 2 megawatts is much more manageable than 2 gigawatts, though 10 or 20 megawatts to run an EV "filling station" is still a pretty substantial amount of power. Using a battery as a load leveler would certainly help, but also would add operating expense. It also makes me think about the PV folks who tout the benefits of grid intertie for leveling THEIR loads. :-) David Roden - Akron, Ohio, USA EVDL Administrator = = = = = = = = = = = = = = = = = = = = = = = = = = = = = EVDL Information: http://www.evdl.org/help/ = = = = = = = = = = = = = = = = = = = = = = = = = = = = = Note: mail sent to "evpost" and "etpost" addresses will not reach me. To send a private message, please obtain my email address from the webpage http://www.evdl.org/help/ . = = = = = = = = = = = = = = = = = = = = = = = = = = = = = _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at 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 Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)