Basically it would be used to recharge the batteries for portable tools. My chargers are up to 550w, and I have two chargers. I've been using my I-Pace in place of my pickup on some jobs. But the batteries stop me.I think you are fine for intermittent use. If you want a buffer to help moderate the immediate load on the vehicle consider making up a battery-inverter combo to bring along and use some jump cables to keep it topped off. Otherwise just about every power tool is available as battery powered and could easily be charged through an inverter.
Does "neutral" and "park" not keep the car running?Is there a way to keep the car "running" for more than 20 minutes? After reading the manual, I thought it might work to start the car from the passenger seat and then exit. The car definitely turns off if you exit from driver's side.