There is just one on-board charger.
When you plug into 120 volts with the "trickle charger" that comes with
the car, the on-board charger is limited to 12 amps draw from the plug.
If instead, you plug into your wall mounted unit, it sends a different
duty cycle on the 12v, 1000 Hz on the control pilot pin which signals
the on-board charger in the car to draw a greater current from the plug.
Smaller duty cycle -> less current. Larger duty cycle -> more current.
Scroll down to SIGNALING:
https://en.wikipedia.org/wiki/SAE_J1772
As you can see, the "trickle charger" and the "wall charger" are not
chargers at all, but very elaborately controlled safety contactors. They
make _sure_ that there is an electric vehicle charger (nothing more and
nothing less) connected to the other end of the plug.
The 2011 to 2012 models have a 3.3 kW on-board charger. Later models
have a 6.6 kW charger.
Level 1 charging is limited to 16 amps (1.92 kW), but the "trickle
charger" that comes with the car signals for only 12 amps from the
on-board charger because it would be too complicated for customers to
choose 16 amps (dedicated 20 amp circuit) or 12 amps (dedicated 15 amp
circuit.) Folks complain either way but they get fewer complaints at 12
amps. (Far fewer electrical fires as well, likely.)
Bill Dube'
On 1/18/2016 4:21 PM, Lee Hart via EV wrote:
Seth Rothenberg via EV wrote:
Does anyone know if the Leaf with 6.6KW onboard
charger is supposed to come with a different kind of EVSE?
Or is the "trickle charge" just that, regardless of
the car's ability to charge faster?
What year? I have a 2013 Leaf. It only has the stock "normal" charger;
not Nissan's optional "fast" charger. There is a blank plate to the
left of the J1772 socket for this fast charger.
Nevertheless, I can charge at either 120vac or 240vac. At 120vac it's
limited to about 12 amps, or 1400 watts. Nissan says it takes "up to
21 hours" to fully recharge at this rate.
But on 240vac, it charges 3 to 5 times faster. Nissan says "4 to 7
hours" to fully recharge on 240vac.
I think Nissan's "fast charger" is really a second bigger charger,
installed in the car. It has its own separate connector (not the
J1772); so yes, you would need a second EVSE to plug it in.
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