On May 22, 2013, at 10:55 AM, Bruce EVangel Parmenter <[email protected]> wrote:
> [ref > http://electric-vehicle-discussion-list.413529.n4.nabble.com/EVLN-Think-Before-You-Plug-In-tp4663123.html > ] > > In all that I've read, 6kW is going to be the norm for level-2 offered > at public EVSE. I do not see very many higher than 6kW public level-2 > EVSE being installed. There is an additional cost for the heavier gauge > power components and EVSE above using a 40A circuit. > > A 10K on-board charger would be able to take full advantage of a 240VAC > 50A source like you could pay for at a RV Park (because electrician code > requires a 80% derating, the 50A circuit should only supply 40A, so > actually you can only get 240VAC*40A=9.6kW). > > But to install an affordable off-the-shelf 10K on-board charger, the > charger had better have the ability to draw only what is being supplied. > i.e.: plugging a 10K on-board charger into a typical 6kW public EVSE > will pop the breaker feeding 6kW EVSE (or the EVSE will shutdown/be > damaged). I'm pretty sure Tom is building the DIY 10kw charger: http://www.diyelectriccar.com/forums/showthread.php?t=59210 Parts/kit from: http://www.emotorwerks.com http://www.emotorwerks.com/products/online-store/category/listing/17-emw-ev-components Not quite off the shelf, as you have to do it yourself, but very cool! Actually, for $2k, you can buy one assembled. corbin > Meaning the on-board charger had better have some smarts to > know to turn itself down according to the capability of the source. i.e: > if you were at a bud's house and they had a 3kW home EVSE, your on-board > charger would have to be smart enough to cut its power draw down to a > 3kW level. > > You could get around having to require a smart charger that can adjust > its power draw by having either three 3kW on-board chargers with their > outputs connected in parallel that you could selectively turn on, or one > 6kW and one 3kW on-board charger if you never think you will be charging > at a 3kW level, or an adjustable on-board charger where you are the > smarts and adjust it to the source before turning it on (I like the > first scenario best: more flexibility, safer for the next driver coming > in behind you). > > > Cor's idea is a good one (note: Cor used the abbreviation nr , which I > believe means leave your contact phone number on your dash ). This is > an old, tried and true method developed up by the EV! club members years > ago. Yesterday I saw something similar to Cor's idea: > A Leaf driver had a 8x11 white sheet of paper in a protective plastic > sleeve laying on the dash in front of the steering wheel which said, > 'You can unplug this vehicle if you need a charge, just plug it back in > when you are done'. > > > {brucedp.150m.com} > > > - > On Wed, May 22, 2013, at 06:56 AM, tomw wrote: >> As the number of ev's on the road increases, EVSE access will of course >> become more of an issue. Unfortunately, some manufacturers and >> converters >> don't seem to take this into account when sizing chargers, assuming most >> charging will be done overnight so a low power charger will suffice. The >> PHEV's that have smaller battery packs also seem to have lower power >> chargers. >> >> There are a few destinations around 50 miles from my home where there is >> only one EVSE. I need to charge a bit to return home. So far that hasn't >> been an issue, but a vehicle left at one of those sites for several hours >> would be a real inconvenience for me or others - say getting home at 9:00 >> pm >> rather than 5:00 pm. I usually have left my car to charge for 3 - 4 >> hours >> while bike riding or hiking nearby those places since I've not seen any >> other EV's there, but I am in the process of upgrading to a 10kW charger >> so >> I can add enough charge in less than an hour, move my car away from the >> EVSE, and then go hike or bike, in anticipation of more EVSE congestion. >> It >> would be a real drag to delay someone by a few hours. >> >> It would be nice to see the predominantly 240V/30A EVSE's upgraded to 50 >> or >> 70A to further shorten charging time. It seems that most of the time >> needs >> could be met with 70A level 2 charging rather than DC fast charging and >> would presumably have lower installation cost due to lower power. You >> could >> add 16kWh in an hour while you have lunch - enough for a Leaf to go >> around >> 60 miles - if your charger could use the full power. Less energy and >> shorter charging time than this would be required most of the time. If >> in >> addition to this everyone moved their vehicle as soon as it was done >> charging, EVSE utilization could be greatly increased. I think >> manufacturers need to look ahead now and increase EVSE and charger power >> before EVSE congestion becomes a big issue - those cars will presumably >> be >> on the road for 8 to 10 years. > - > > -- > http://www.fastmail.fm - mmm... Fastmail... > > _______________________________________________ > 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) > _______________________________________________ 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)
