If you or someone you know ever needs a refresher on the difference between Kilowatts (kW) and Kilowatt hours (kWh) watch this video that Jason Cammisa made.
BMW also finally stopped listing their pack sizes in Ah (ampere-hours), moving to kW-hr like the rest of the world-other-than-battery-engineers. Being both of German heritage and an engineer, though, I quietly cheered them on with their their stubborn insistence on technical accuracy - an affliction I, too, possess
<ignore> Don’t recommend driving a German EV (BMV/Mercedes) as in a typically German engineering fashion they accurately and completely confusedly use kWh/h … basically acceleration of usage. </ignore>
- kW is power, kWh is work
- kW is instantaneous energy being consumed/provided, kWh is quantity of energy available to be consumed/provided
- So a battery provides some amount of kWh, which is at any moment is a precise amount of kW delivered to the system, to go zoom
- So 10 kWh is 1kW provided continuously for 10 hours.
- Or 10 kWh is 10kW provided continually for 1 hour
- The battery is a bucket of kWh, the kW is how big the spout is as you pour it out (or pour it in!)
I think they’re finally getting rid of that as nobody understand it …
My mother was second generation German and I too am an engineer, but I guess it didn’t take with meBeing both of German heritage and an engineer, though, I quietly cheered them on with their their stubborn insistence on technical accuracy - an affliction I, too, possess
LOL. True story. Most of my career prior to retiring was designing mechanical systems for commercial, school, clinic, and industrial buildings in far-northern California. When touring Germany a while back, I walked around a new school campus to get a feel for German design. When I got to the boiler room, it had a floor-to-ceiling picture window, showing the almost sculpturally precise equipment and piping installation. A picture window in the boiler room! That is when I “got” the German mindsetMy mother was second generation German and I too am an engineer, but I guess it didn’t take with me
joking aside I was a lead architect for a project in Germany for many years and got frustrated with that insistence, as it usually lead to winning the battle and losing the war. It’s a great characteristic at the design/implementation level and the German engineers are rightly proud of their distinguished heritage in engineering, but at architecture level you need to see the big picture and put things in context, such as the fact that your customers aren’t engineers