Correct, Green means "available" so you would instinctively expect an empty spot at a green light. I would suggest a slight change to the meaning of the colors: Red = charging (no matter how fast/slow) Yellow = charging ended, spot should be vacated as soon as possible (grace timer) Green = charging and grace timer ended, spot is available (even if full EV still plugged in).
Anybody parked in a "green light" spot is suceptible to ticketing and towing. Grace time can be tuned to match need/demand, with appropriate signage. When a "yellow" charging space is vacated, an EV can immediately plug in and turn the spot to "Red" again. If a spot next to the EV charging spot is available and an EV arrives that urgently needs a charge, it should be perfectly fine to unplug a "Yellow" or "Green" charger. Preferably he leaves a note at the car, how to contact him and how long he needs to charge before it is OK to unplug when the official EV charging spot is in use again. Note that it is possible to implement a max charging time with this as well: Towards the end of the max charge time the light turns yellow and when the charge time has expired, it stops charging but may allow an additional grace time before the light turns green again and you should be on your way (or moved out of the spot at least). At companies with high contention for too few spaces, it makes sense to force everyone to switch during lunch time (for example max 4 hours charging). Many EVs already announce how long charging is going to take, so it should be no surprise how long one can leave the car before it needs to be moved. Obviously it is user friendly if the charging station sends you a txt when charging ends and the grace time starts. -----Original Message----- From: EV [mailto:[email protected]] On Behalf Of EVDL Administrator via EV Sent: Wednesday, December 13, 2017 1:40 PM To: Electric Vehicle Discussion List Cc: EVDL Administrator Subject: Re: [EVDL] Combating ICED EV parking spaces On 13 Dec 2017 at 13:08, Lawrence Harris via EV wrote: > I would love to see a big light on the top of the charge head that > goes green while charging, amber when the charger ramps down to the > end of charge and red when done. Outstanding idea, but I'd recomment the exact opposite of the colors -- red for bulk charging, amber for absorption (last 20%), and green for charged. That's because almost every other charger used on personal gadgets (phones, cordless drills, and so on) uses those colors or something similar. It's read for charging, green for done, and sometimes you get yellow or flashing green during the absorption phase. I don't think I've ever seen any other charger that was lit up red when it was finished, except for a couple that never changed color. 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) _______________________________________________ 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)
