David, Everyone always mentions 8 hours of charging overnight, but most commute cars sit much longer in the garage than that on normal weekdays, my EV has about 15 hours of charging time if I let it stay plugged from the moment I get home till I leave the next morning. So, even at the 12A rate from my 120V outlet (my garage outlets are on a 20A breaker in the service panel, but the outlets are 15A type and I am using a power strip as a short extension cord with on/off switch to disconnect power before unplugging) I am getting about 1.5kW max power so with 80% efficient charging this is 1.2kW into the battery pack for 15 hours is 18kWh which covers all that I can drive with the truck. And since I can also plug in at work, I can drive even more in a day if I want to. All from charging at level 1 which is more than 99% of my charging till date - until I get time to install my JuiceBox. Or more accurately, to install the 240V plug for my JuiceBox.
Cor van de Water Chief Scientist Proxim Wireless office +1 408 383 7626 Skype: cor_van_de_water XoIP +31 87 784 1130 private: cvandewater.info www.proxim.com This email message (including any attachments) contains confidential and proprietary information of Proxim Wireless Corporation. If you received this message in error, please delete it and notify the sender. Any unauthorized use, disclosure, distribution, or copying of any part of this message is prohibited. -----Original Message----- From: EV [mailto:ev-boun...@lists.evdl.org] On Behalf Of EVDL Administrator via EV Sent: Tuesday, October 20, 2015 9:37 PM To: Electric Vehicle Discussion List Subject: Re: [EVDL] EVLN: Buying An Electric Car: Why Charging Rate,DC Quick-Charging Matter On 20 Oct 2015 at 19:34, Mike Nickerson via EV wrote: > I've seen 20A circuits, but only in commercial installations. You'll see plenty of 20a branch circuits in homes - all newer homes are wired this way - but 20a receptacles on them are indeed pretty rare. This is because the code has an exception allowing cheaper 15a-rated receptacles on a 20a branch circuit, as long as there's more than one outlet on the circuit. If there's only one receptacle on the circuit, it must be a 20a-rated recept. (Code experts argue over whether a duplex receptacle counts as one or two outlets.) IIRC, the code ALLOWS but doesn't REQUIRE 20a-rated receptacles on a multiple-receptacle 20a branch circuit. I installed 120v 20a recepts on the branch circuit in my garage to allow for better EV charging, though I'm not 100% convinced that (once you're beyond the 50 cent bargain bin junk receptacles) there's much difference between the guts of a 15a-rated recept and those of a 20-a rated recept. One more note about this. Because code limits sustained load on a branch circuit to 80% of its maximum, you can charge at no more than 1920 Watts from a 120v 20a residential branch circuit. If your EV gets 250 Wh/mi and has a typical 80% charging efficiency, you gain just over 6 miles of range per hour of charging. If you sleep 8 hours and charge while you sleep, that's 48 miles you can drive per day. It could be more than that, since some switchmode chargers do better than 80% efficiency. Also, staying below 80% SOC increases battery charging efficiency. But that's a pretty good rule of thumb. You're much better off going with a 240v circuit and charger. A 240v 20a circuit gives you 3840 Watts, for over 12 miles of range per hour of charging - 96 miles overnight. A 50a range / welder circuit is an even better bet, as long as your charger has the guts to use it. That recept allows 9.6kW charging. At that rate the EV described above gains over 30 miles of range for each hour of charging - about 245 miles overnight. 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 Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at 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 Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
