On Thu, 28 Aug 2014, Michael Ross via EV wrote: > All I am saying is that "simply" is not really that simple. Tesla made a > very good choice with their battery design. For them it IS simpl-er. It > took a clean salte for them to do it. > > Handling is not an issue for the S by virtue of that choice. > > There is a certain material inefficiency to make the car larger for > something it only has to do occasionally. It is a choice I would not make. > I would buy a car that does most of my traveling in its standard form. > When on a long trip, I might rent or drive ICE. I used to buy careworn > used cars and rent for trips to save money. It makes sense.
The battery pack in my three year old Leaf no longer has a capacity of its original 24KWH. However, it is the same size and weight as it was when it had a capacity of 24KWH. In the leasing model, battery packs have a guaranteed capacity. It does not have a guaranteed manufacture date. A pack that is not of the largest capacity, probably was leased previously as a higher capacity pack. A pack that can no longer meet the highest guaranteed capacity, can be leased as a pack with a lower capacity. It will have the same size and weight as the higher capacity pack. This may have some effect on the energy used per unit distance traveled, but probably not much. Drivers will choose to lease a pack that meets their needs taking into account capacity and price. Ed > > > On Thu, Aug 28, 2014 at 12:32 PM, Willie2 via EV <[email protected]> wrote: > > > On 08/28/2014 11:16 AM, Michael Ross via EV wrote: > > > >> Hi Ed, > >> > >> I agree with your logistical work up. It makes sense. But... > >> > >> " can simply have the pack swapped" > >> > >> This jumps out at me as a stretch. You are talking about putting in 140% > >> more battery pack to get to 60kWh At the very least, you would have to > >> buy > >> a car with 140% more space in it for batteries than it needs most of the > >> time, and the effects on handling can't be negligible. If it was trunk > >> space, then when making a long trip you would reduce your carrying > >> capacity significantly. No car designer would look at this as "simply." > >> > >> You may have a conversion mindset. A well designed purpose built EV can > > easily accommodate a range of battery sizes. Witness the Tesla S, > > originally offered with three sizes. 40-85kwh. And I doubt there was much > > difference in the center of gravity between the three batteries. With the > > improving energy density, we can soon expect 100+ kwh in the same form > > factor. > > > > _______________________________________________ > > 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)
