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Lemme extend Michelle's comment a bit....
Indeed, both 12V outlets power off when the car is powered off. If you desired to power an accessory via the Prius you could always put the car into the IG ON mode (two pushes of the power button without depressing the brake). I THINK this would allow you to use the 12V outlets and the HV would continually recharge the 12V battery giving you a pretty long duration of power.

Alternatively, you could power the prius all the way up to READY mode and just let the ICE run as needed. I think that would be a pretty minimal amount over the course of an evening if the only power drain was a TV or something like that.
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