[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). 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...
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