Still not as bad as kwh/hr. That one is showing up on some car UIs now.

Why can’t we just use the right unit for energy - Joule? A battery capacity should be stated in MJ / GJ.

An hour is a popular unit for me personally. I measure my work and plan my day in hours (since pretty much all clocks use hours, not kiloseconds).

I don't use seconds very much (with the exception of Unix epoch seconds, or a short experiment).

I can't divide by 3600 in my head. I can, however, multiply by 1. Therefore, Watt-seconds (AKA Joules) are not as useful to me as Watt-hours and kiloWatt-hours.

Natural gas is consumer priced in GJ and seems to work fine. Eventually we would just develop and intuition about number of K/M/G J in various battery sizes without the complex/ugly kwh unit.

I hear this occasionally, but what are the benefits relative to kwh?

It basically comes down to stating things in their simplest and most correct form. It is like using 75/25 to express the number 3. When expressing an energy value, use the right unit (Joule) not a derived unit multiplied by another quantity to get back to the original.

That's at least dimensionally correct.

Maybe the machinery takes 3 hours to spool up to generating 1kW?

No, it gradually increases its consumption at a rate of 1 kW every hour, thus at the 3-hour mark it's consuming 3 kW.

Gosh. Better make sure you put it on a timer switch or that's going to get expensive.