Yes the DC fast chargers (the only device that is factory designed to be plunged into the direct DC port) Go through a handshaking processes with the Imievs battery management system. enabling the contractors to be be opend and DC current to flow. This link would need to remain open and several data streams would be monitored over the period it was accessed like voltage, temp and capacity.
The smarts are built into the DC fast charge units .
I have mentioned before that MM offered a factory DC/AC inverter for the Imiev in Japan. It's demonstrated in a few videos online running a small street party and powering rice cookers and food warmers and lights. I think it was only 1500w or so. Big heafty looking unit but most likely 110v.
It all boils down to what you really want offgrid power for . If it's just a a week or two in a emergency than worrying about your cloths dryer, dishwasher, water heater or central heating not working is a bit over the top. It's only 16kwh and most likely only about 14kwh at best is available to use.
In 1kg of LPG there is 14kwh of energy so one 9kg LPG BBQ bottle has 126kwh of energy (That's one massive battery!) one 9kg LPG bottle full (that can be stored for a long time) and a burner or two to heat water or cook on then a few small 12v appliances like lights, phone chargers, tv, radio, laptop fridge that can run from the Imiev for a very long time.
Not as cool but the most sensible way for emergency.
Offgrid 2008, Selectronic PS1 6kw/48v inverter, x 2 Midnite solar classic 150 MPPT, 3960w NE PV 24 x 165w BP panels, 4200w NW PV 21 x 200w DAQO PV, 16x400ah lithium.