Subj was: RE: [EVDL] EVLN: E-school-buses$aveschooldistrictsmillions >> I just think the fluctuation in loads is substantially more predictable >> than the number of vehicles plugged in at any one time.
Which trigger my 2 cents: V2G will never be practical unless vehicles are plugged in all day. And if they are pluggedin all day, then they only need 120v L1 15 amp service. Already, we know that 97% of charging-at-work is satisfied with L1 charging. So in order for V2G to be able to take advantage of all the demand-load of millions of EV's and/or to also take some charge, the focus has to be on low-cost L1 approach, not expecting EVERY EV (by the millions) to have a 50 amp L2 service and to sit there blocking it all day long. That is simply unsustainable at the quantities needed. Millions of L1 outlets is possible and practical. But providing at least demand-response at every L1 outlet in a parking lot is as easy as hooking up a water-heater or Airconditioner utility disconnect and giving the utility immediate control over that load during the day. This is not only dirt cheap, and practical, it eliminates the #1 issue with V2G (NFMB, Not From MY Battery!). Sure it gives up 50% of the promise of V2G (and all its NFMB issues) but the other 50% is the low hanging fruit, that is PRACTICAL at SCALE is simply L1 charging-at-work with demand response control of the outlets. Bob Bruninga, PE EVADC _______________________________________________ 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)
