Wow, the BRUSA seems like a really awesome charger. Thanks for posting that.
It's specifically designed for EVs.
I've found the manual of a predecessor of the same series:
http://www.brusa.biz/fileadmin/Diverses ... b_Nr25.pdf
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The cool thing is that it includes a booster mode where it tracks the current drawn by any 3rd party on-board charger and then matches its output to that. It also generates a new pilot signal for the on-board charger.
So the manual suggests that you just need to loop it into J1772 inlet. It needs L1, L2( or N), ground and the pilot and connect it to 400V EV battery and the 12V battery. And the unit will do the rest.
No additional circuit or connection to the CAN is required!
The company also sells you the connectors for the units complete with cables.
So you still need to find and crimp the proper Nissan 400V and AC connectors and most likely an new J1772 inlet with thicker wires.
Instant 6.6 kW charger, but at a price.