OK, I replaced the $20 battery and got my Setec up and running again to make some observations.
Q. When Setec unit is kept on, but no load, what is the idle load? What state does the leaf remain at?
A. Once the V2X session is started the LEAF's three blue lights on the dash look just like they do when charging with an EVSE: Two solid, one blinking on the driver's side. The "plugged-in" light illuminates on the console, and a red light that looks like a car symbol flashes too.
LeafSpy shows Aux Power at 100W, so there is some overhead there for the car to manage the process.
Q. When Setec unit is shut down, but CHAdeMO is connected, what is the idle load - might change over time?
A. Leaving the Setec on, with no load for one hour, provided negligible change on the LEAF's state. Battery Volts went from 394.0 to 393.5 but Remaining Ah actually went up a bit from 53.54 to 53.60. Battery kWh remained unchanged. Note that I kept the Setec's 12V battery on a trickle charge, but I can't imagine there was much energy drawn there. I am aware that the Setec keeps a charge on its battery when running. Maybe next time I will place a Kill-A-Watt meter on the battery tender.
Q. Overall energy efficiency?
A. For now I just ran one test with a 1.2 kW space heater as a load bank for two hours. The Kill-A-Watt meter measured 2.71 kW after 2:07 hours. So this is 1.28 kWh of energy consumed by the space heater.
I have attached the LeafSpy screens BEFORE and AFTER. If I'm reading it correctly the Battery kWh dropped from 16,662 to 11,625 for a 5 kW consumption. Could this be right? I'm using a LiteFuze 5000 step-down transformer which has an Efficiency Factor of 1.5 so no doubt there is some loss happening there.
Q. Would you be willing to log a V2X discharge session?
A. Certainly. I just got the OVMS installed and am working on a DB9 to 2-wire adapter so I can log the CHAdeMO pins 8 and 9 on the Setec side of the connection. Christmas may delay getting this done