From the article:
The average home consumes about 20 kilowatt-hours per day, a measure of energy over time.
That's .833 kw per hour at an average amperage of 3.5 amps at 240 VAC. That estimate is absurdly low.
Here's another estimate:
According to data from 2020, the average amount of electricity an American home uses is 10,715 kilowatt-hours (kWh). If you divide this number by 12 (months in a year), the average residential utilities customer uses 893 kWh per month.
If you divide 10,715 kWh by 365 (days in a year), you’ll get the average number of kilowatt-hours used per day, which is 29.36 kWh. If you multiply that by 1,000, you can find the energy consumption in watts that occur in 24 hours, or 29,360 watts. If you then divide that by 24, you’ll find that the average household requires 1,223 watts of power.
https://www.forbes.com/home-improve...lowatt-hours (kWh). ... 3 Home Energy Audits
That one puts it at nearly double your estimate. I'd say for most homes of 2500 sq ft or larger that the usage is closer to double or triple the 1223 watts.
I own a 5.5 KW rated contractor generator, and I
KNOW FOR A FACT it won't supply my home's full running amount of power usage. I have to limit what I run if I'm powering the house with it.
My estimate is that you plug in your car to power your house, you've got maybe 12 to 16 hours--at most--of power, probably less, since as the battery gets closer to full discharge it will not supply as much power as it did with a 50% or full charge. With vehicles like a Tesla, you also run the risk of bricking the vehicle doing this.
By the way, I paid about $600 for my generator (about $1200 with inflation considered today). It will run on 6 gallons of unleaded for 8 hours. Let's be generous and call that $4 a gallon. So for three days I'd pay $216 for gas and a $1200 generator rather than $60,000 to $90,000 for an EV and something like $100 in electricity. My generator is a better deal for those rare occasions I need to power my house, not to mention it doesn't tie up my vehicle meaning I can still go places too.