On most modern EVs, that's at least 3 days worth of power if the vehicle is not being driven. Larger vehicles naturally have far larger batteries.

Mmmh no? 90kWh battery packs are not that common. An M3 or MY LR AWD have an 82kWh. Some Mercedes and some Chinese model have a 100+kWh battery but the most common setup is between 60 and 70.

Anyway I agree that in emergency conditions it can go a looong way for a house.

My bmw has 108

Is that 30 kW each hour of the day or 30 kW per day?

Sort of neither?

It's 30kW for one hour.

(Or 1.25kW for 24 hours, or however you prefer).

[Link: https://en.wikipedia.org/wiki/Kilowatt-hour]

Pretty sure GP understands that, their point being you can't just wave away 'per unit time' when talking about it relative to generation, it matters.

"30kWh per day" isn't waving away anything.

30kW is a rate.

30kWh is a measure of energy, about 100MJ.

30kWh/day is a rate again, 100MJ/day.

It seems clunky, but it's a way energy usage in a house is typically measured.

"30kW per day" makes no sense. W is a unit of power, Wh is a unit of energy. Unintuitive because a guy named Watt decided "Joule per second" is Watt, so the units Joule and Joule per second got turned on their head to W times hour and Watt. This is opposite to usual intuition of distance and speed for example, km and km/h. If I redefined the km/h to a "tick", then a km would become "tick times hour".

If you want a "better than nothing" but imperfect analogy, Wh is how much water you have in a bottle, and W is how quickly you can get the water out.

The naming of the unit is posthumous

And yet all utilities of the world decided to use kWh as the thing to measure. Also basically all smart measurement devices settled on this being the default to show. Exactly in the way he used it here, kw per day, kw per week, kw per month, kw per year.

This discussion seems super silly, considering he's just using the measurement that the industry adopted decades ago...

Are y'all just coming out of a time travel device from the 70s or something?

Wh is a unit of energy. They're saying how much energy they consume per day.

No, their point is wrong either way and there is no way to steel man it without saying the comment is extremely poorly articulated.

30kWh is 1.25kW for 24 hours or 30kW for one hour.

30kW every hour means 720kWh per day. 30kW all day is also 720kWh per day.

The comment is nonsense.

The only way you can steel man it is by saying he isn't concerned about the 1.25kW, he is concerned by the swings, but the said 30kW twice for two different time spans so that can't be it either.

[delayed]

30 kWh per day, while a clunky unit, is what most people would understand when talking about home consumption. It’ll be what their utility typically reports, how you’d want to size a battery, etc.

30kW per hour would be a pretty incredible home usage.

That's 2-3 days worth without changing your use pattern, which surely you would do if you expected a long blackout period?