Question on using 2nd Gen Prius as Home Generator

Hypothetically speaking, you could do something like that. You'd be making the connection using a mutant extension cord that's a plug on both ends, meaning you would have exposed prongs supplying voltage, and of course you can in theory be careful enough to avoid getting into trouble with that, but it's got a strong "hold my beer" quality.

Chances are your breaker panel distributes the 120 VAC breakers over the two legs of incoming 240/120. You will only get power on those circuits that sit on the same leg as the receptacle you backfeed.

You can use a 2000 watt inverter in the car and possibly get a bit more surge starting capacity with it, but you have to understand the car can't give you sustained power from the 12 volt system in excess of around 1000 or 1200 watts.

If you need to sustain a larger load than that, you could look at the thread below.

Electric power from a hybrid, connecting inverter to the high-voltage system | PriusChat

 

Ok, well then you'd still have live voltage on exposed pins at that receptacle. That might be marginally safer than having a male-male cord lying around, but on the other hand it means the Dangerous Thing has been deliberately built into your house and isn't just a random loose item sitting there.

Could be a weird conversation with insurance if anything ever happened.

The proper way to use the receptacle you linked would include an interlock switch fitted such that you could have your main breaker on OR you could have that receptacle on, but never both at the same time.

This protects more than you realize: If you accidentally forget to cut off your main breaker, you have the potential to backfeed power across the neighborhood. The transformer outside which has been cheerfully stepping down voltage into your home will just as cheerfully step your inverter power up to very high voltages, potentially endangering electricians working to fix overhead lines etc.

The inconvenient moment of a power outage is the wrong time to abandon safe practices in handling electricity. Dead wrong.

 

Back feeding power is NEVER a good idea, best to temporarily run extension cords from critical appliances to the inverter.

PlugOut Power has developed an inverter to connect to a Prius for home use. I don't know much about the company, but here's the link if anyone is interested. HOME | PlugOut Power, Generator for hybrid vehicles | United States

 

They can be found from the thread linked above as well, which considers the application more broadly and also covers some other sources.

Electric power from a hybrid, connecting inverter to the high-voltage system | PriusChat

 

While there are downsides you've certainly discovered, that's the right way to do it until you commit to something properly built in and up to code.

 

here's a tube that explains how to semi safely install the equipment needed when backfeeding generator power into the homes electrical service. The manual way using the fixture posted above from amazon.
youtu.be/I_fxXGb8t_k?t=56

there are other more automated more complex. safer ways to setup the transfer. The video above is a good place to get started - imo - researching your generator hookup strategy.

Keep in mind - it might not pass code where you live, so be sure to check if it does pass code before you install it.