Ben, I think the problem may be more subtle than you describe.
Unless the manufacturer completely solves the problem of describing remaining capacity, the user won't have a gauge that reads 30 kWh of remaining capacity. The user will be faced with a gauge that still reads 50 kWh, without knowing where the bottom is. Is "empty" 0, or 10, or 30? How do you describe the remaining capacity without completely draining the battery (and potentially damaging the cells a little bit more)? Mike On March 25, 2015 3:34:02 PM MDT, Ben Goren via EV <ev@lists.evdl.org> wrote: >On Mar 25, 2015, at 2:00 PM, EVDL Administrator via EV ><ev@lists.evdl.org> wrote: > >> When it >> comes to estimating remaining range, the problem gets even more >difficult. > >I think that's where the real problems come in -- and they're the exact >same problems for any other vehicle. > >Are the miles you're planning on driving from Sedona to Flagstaff (all >uphill) or the other way 'round? > >Are the miles you're planning on driving cruising at a constant and >sedate 45 MPH or are they all going to be on the drag strip? > >Are the miles you're planning on driving with an empty load, or are you >about to hook up a trailer with a 500 gallon tank full of water? > >Personally, I'd be happy with a gauge that measured usable kWh >capacity, with the actual numbers labeled. If the car leaves the >factory with 50 kWh useable, the dial goes from zero to fifty. If >you've used the car hard for a few years and you only get 30 kWh usable >out of the pack, the dial still goes from zero to fifty but the needle >never points past thirty. > >Couple that with a real-time display that shows you power output in kWh >/ mile, and most people will be able to intuitively answer any question >they might think of. > >It's also a direct parallel with what people are already familiar with >in ICE cars: a tank that is effectively calibrated in gallons (even if >it's not labeled that way) and, in many cars, an instant MPG reading. > >b& >_______________________________________________ >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)
