I did not use enough wording to make my my point / interest understood.
I am aware of the a dual coupler L2 EVSE that provides 6kW on each port.
Coulomb had a one back on their first generation models, the CT2020 series
http://a.img-zemotoring.com/media/news/2011/07/coulomb-ct2021.jpg
and the CT4000 series they offer today
http://www.chargepoint.com/img/products/ct4000/ct4023-wall-dual-left.jpg
Either of those require a 12kW electric power source for 6kW for each j1772
coupler.
I am trying to express a need for a smarter L2 EVSE with dual j1772 couplers
that operates / runs off a 6kW power source, that manages the amount of
electric power it provides to the plugin(s). This proposed L2 EVSE design
will provide the full 6kW if only one plugin is connected, or if two plugins
connected would provide 3kW to each.
So, why would I want that? As I mentioned, most production plugins can only
use 3kW of power. This does several things:
-it saves money for the host on installation costs (cheaper instillation
wiring and power panel demand)
-it levels the charging demand (utilities might complain less, and perhaps
less driver complaints when two 3kW charging plugins are hogging / using two
6kW EVSE
-it also allows hosts to ask for a little premium if the EV that can charge
at 6kW wants the whole EVSE for itself (another plugin could still be
connected but would not get a charge until the EV's charging demand reduced
down to allow sharing of the power)
I do not believe I am thinking not too far ahead because what is implemented
at rapidly growing charging demand locations (like here) can be followed /
heeded at locations that are up-n-coming. Hosts that have already installed
EVSE will want to use the electrical power panel capability they have more
efficiently.
Those that have been in management or had been involved with their decisions
will know that managing money can and is done in interesting and creative
ways. Whether the host is a city or a company, the money being spent on EVSE
installations, can be drawn from various allocated funds (new / capital
equipment purchases, maintenance, support / repairs, etc.).
After a host has already spent the money to have the EVSE installed with
discounts from the U.S. Fed. Gov. funds, money to rearrange existing EVSE to
a more efficient use or replacement EVSE (sometimes replacement is cheaper
than repairing them), managers can find interesting ways to find funds.
{brucedp.150m.com}
On Sun, Aug 31, 2014, at 09:16 AM, Mike Nickerson wrote: ...
> There is a Chargepoint EVSE that does have two J1772 ports. Each port
> can charge at 6 kW if used alone. If both ports are being used, they get
> 3 kW each. Chargepoint calls this charge sharing. The EVSE is fed with
> a single 40A / 240V line.
>
> HP in Boise installed two of these early this year. I would have to look
> up the model number ...
-
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