On 20 Nov 2014 at 13:42, Robert Bruninga via EV wrote: > Amen, at 100kW, a single Tesla charging demands the grid provide the > equivalent of ONE HUNDRED homes average power.
Well, maybe that's what you get if you take the kWh consumed per month and divide by the number of hours in a month. Maybe I'm missing something, but as I see it, that's not what matters. It's about the peak load. A house with just a few lights on might use only a few hundred or a few dozen watts. One with aircon running flat out against a 115 degree day, or electric baseboards struggling to overcome a -20 night, of course needs more. You might have an electric water heater or clothes dryer or range running. How about when you're drying the table linens while you wash dishes in the dishwasher, cook thanksgiving dinner on all 4 surface units, and bake the turkey in the oven? Now there's a peak load. (Are you also charging your EV?) The main electrical panel of most houses can supply as much as 48kW (200 amps at 240 volts). Some newer big houses have double that rating. So we already have those potential loads of nearly 100kW connected to the grid. Conversely, is that charging station filling up 100kW Teslas 24 hours a day? Probably not, at least not yet. Like your home, its load varies with what it's charging. A 100kW charge should also cost the EV driver significantly more per kWh than a 20kW charge, because (1) it costs the station more to supply it and (2) it's worth more to the customer. These higher costs will naturally limit its use. A reasonable (and affordable) high power charging station would also use load leveling strategies. That way it could take energy from the grid at low peak (and low energy cost) times, and use it for charging EVs at other times. If we get to where we're charging EVs at 100kW at a charging station that looks like the ICEV filling stations around here at rush hour - OK, that might be a problem. (Talk about an EV adoption success!) But I doubt that that's going to happen for a long, long time, if ever. Or am I missing your point? 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 For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
