On 1 Aug 2014 at 13:17, Ben Goren via EV wrote: > it probably also makes sense to get an air conditioner that runs [on] > the 12V system so it, too, can run when the car is plugged [in] ...
I'm not so sure. I've read that a typical automotive aircon moves around 25000 to 30000 btu/hr. That can take a fair bit of power and energy. For example, I just found (online) a 24500 btu/hr LG room aircon that uses 12.7 amps at 230 volts (2.9kW assuming unity power factor). A comparably efficient unit running on 12.7 volts would require 230 amps. That's a pretty sizable long-term load for your 12v system. To look at it another way, you'd need twelve fully charged 90ah lithium cells to run that aircon for an hour. Even at 50% duty cycle, you'd still need eight 60ah cells. The energy usage isn't so much of a problem if you're just talking about cooling the car while it's parked and charging, though don't forget that any power the aircon uses isn't available for charging. However, you'd still have to have a pretty robust 12v system to power it. I think you'd be better off with an aircon powered by the main traction pack voltage. At least the current required would be more manageable. 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)
