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.
replyThat's 2-3 days worth without changing your use pattern, which surely you would do if you expected a long blackout period?
replyIs that 30 kW each hour of the day or 30 kW per day?
reply30 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.
replySort of neither?
replyIt's 30kW for one hour.
(Or 1.25kW for 24 hours, or however you prefer).
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.
reply"30kW per day" makes no sense. It's like saying "I drove at 100km/h per day". W is a unit of power, Wh is a unit of energy.
replyIt's 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.
"30kWh per day" isn't waving away anything.
reply30kW 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.
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