On 7 Dec 2018 at 10:30, Steve Heath via EV wrote: > To me it is very important as I have a small battery > pack - it is now around 6-7kw - and saving 10 or 20 watts per mile can make a > big difference.
Better extend that detention. :-) I don't mean to make a big deal about this, but saying your battery capacity is 6-7kW is kind of like saying your ICEV's gas tank holds 20 horsepower. Kilowatts are a measure of power. You want Kilowatt HOURS, the measure of energy stored in the battery. > > All this is all to do with removing/reducing range anxiety. If you have a 7kWh battery, I can see why that would be important. :-( > Why manufacturers don't have a separate battery pack for the > ancillaries so that their use does not reduce the driving range, I > don't know. There's actually a good reason for that. When you weren't using the heater, you'd be carrying around useless dead weight. It's because an EV has only so much room and weight capacity for the battery. If you dedicated part of that space to a battery solely for heat and other extras, it would just be sitting there when you didn't need it, adding weight but not range. It turns out that the most efficient and cost-effective way to handle these extras is to make the traction battery as big as it can be (given space, weight and cost considerations), and power the extras from the traction battery. 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)
