> That's a really cool demonstration. What we don't know is the DC/DC converter specs in all the cars. It has been determined for the Prius to be about 850 Watts that you can draw from the 12v battery long term without dropping the battery voltage below a reasonable charge state. Of course, you can draw 2 kW for peaks but the excess is coming from the battery. We know the HV fuse is 120 amps in the Prius which equates to 1500W max but current from the DC/DC I think is limited to 85 amps?
I should have looked at my battery state in the Volt at the end of the 2 hour load... I will happily compile the determined values from other EV's if people care to submit. The test consists of running a load on the 12v battery long enough to find the steady state where the power coming out equals what the DC/DC converter is providing from the HV battery while leaving the battery say at "half charge". Im sure someone on here will nail down what that 50% lead acid steady state voltage is such that half the capacity remains in the 12v battery? Is 12.6v a good number? Bob -----Original Message----- From: EV <ev-boun...@lists.evdl.org> On Behalf Of Peri Hartman via EV Sent: Friday, January 18, 2019 11:11 AM To: Electric Vehicle Discussion List <ev@lists.evdl.org> Cc: Peri Hartman <pe...@kotatko.com> Subject: Re: [EVDL] Using EV to demo emergency power That's a really cool demonstration. Especially showing the you dinged your range by such a relatively small amount. That should help increase the awareness for people who rent portable generators for festivals and other off grid locations. Just bring your EV instead :) Peri ------ Original Message ------ From: "Robert Bruninga via EV" <ev@lists.evdl.org> To: "Electric Vehicle Discussion List" <ev@lists.evdl.org> Cc: "Robert Bruninga" <bruni...@usna.edu> Sent: 18-Jan-19 7:28:34 AM Subject: [EVDL] Using EV to demo emergency power >Using your EV to demo Emergency Power. > >I powered last night's Climate Stewards Annapolis Monthly Meeting from >my EV. > >I rigged my VOLT right out front on the sidewalk with yellow lights >blinking, and then an extension cord coming out of my trunk and >conspicuously run through the front door and plugged into the first outlet. > >I had visited the day before, and moved that outlet's wire at the >circuit breaker over onto the same circuit as the meeting room's >lights. This way the lights and that outlet were on the same circuit. >So All I had to do on meeting night was flip that breaker off (and tag >it out) and then backfeed the outlet. > >Then without detracting from the other speakers and the agenda for the >meeting, I was able to include the following summary in my 30 second >intro: > >"Although our building is solar powered and we now have ten EV charging >outlets in the parking lot, a few people ask about emergency power when >the grid goes down. So tonight I am demonstrating the powering of this >building from the Volt parked outside. Total cost is about a $200 >common inverter hooked to the Volt's battery. At the average American >1kW load, the EV should be able to power the house for about an hour >and only use up about 5 miles range. And for long term outages, I can >just plug the Volt into the solar panels "secure power" outlet and >charge it during the day and so on indefinitely while the grid is down". > >Turns out, I used up about 15 miles of range in 2.5 hours. Because I >overlooked the typical system overhead of the Volt which should have >been about 1 mile per hour. > >But I did discover the no-driver-timeout to be about 2 hours. Right at >the end of the meeting, as people were rising to leave, the lights went >out. The volt had just turned itself off. A quick run to the car to >push the power button again was all that was needed. > >Anyway, the main meeting rooms fluorescent load was on the order of 1 >kW, just at the limit of my 1 kW inverter. But when we replace them >all with LED's that will be down to about 500W and then I can combine >that with the lobby LED light circuit and have all those most important >lights on one circuit and one outlet for future emergency operation. > >I have been to Home Depot now 6 times and bought three different types >of tube bulbs, but stil have not found ANY that will work. With or >without ballast. Though I was only buying their cheapest. Next, Ill >go get the box of NO BALLAST bulbs and that should work. > >Oh, the room has 3 different light circuits, so there was always backup. >I was powering the main cove lighting. Then there are accent lights >around the walls and dome lights way u p in the ceiling. We left the >accent lights on the grid so that I wouldn't leave them completely in >the dark if my system failed. And we leave them on anyway even during >movies... So, I got to score additional visibility each time the >speaker went from talking, to her three different movie clips by >jumping up each time and going to the light switch to turn off the >lights and comment "just saving some more miles"... The audience really got into it... > >Bob >_______________________________________________ >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) > _______________________________________________ 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) _______________________________________________ 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)
