cwerdna wrote:kW and kWh are very different metrics. It's the same as confusing gallons with horsepower. Think of kW = horsepower, kWh = gallons.
powersurge wrote:I would like to make a motion for people to stop correcting other members posts when it is clear what they are saying. They did not ask to be corrected, and I see this all the time. Would you correct people's speech when you are face to face with them?
They didn't ask to be corrected since they probably didn't realize they were wrong. Just because you see it "all the time" doesn't make it right. If EV enthusiasts can't get it right and develop good habits (and pass along proper information to others), how can we expect others to get it right?
My job requires that I be detail oriented. Also, if I were on the other end a service advisor, at an EV/PHEV automaker, EVSE/charging station company and someone made complaints to be me and was WAY off in their usage of units, I'd question whether the person knew what they were talking about.
We've had repeatedly correct this one one guy like at http://mynissanleaf.com/viewtopic.php?p=389321#p389321
Using incorrect units can get confusing when certain numbers are similar...
The Model S is currently available with 70 and 90 kWh capacity batteries. And, it has 10 kW and 20 kW AC charging options... I recall older Teslas being limited to 90 kW Supercharging.
Most sub-$40K pure BEVs have usable battery capacities in the 20 kWh range. The Gen 1 Volt had ~10.5 kWh usable.http://www.mybmwi3.com/forum/viewtopic. ... 7317#p1750
says a Leaf needs almost 23 kW to maintain 70 mph.
Tesla Model S can have either single 10 kW OBC or dual OBCs for 20 kW charging on 80 amp EVSEs. Leaf has a 24 or 30 kWh capacity battery. BMW/Bosch has a 24 kW SAE Combo DC FC: http://www.bmwicharging.com/BMWiDCFastCharger
Other recent Tesla-powered vehicles (e.g. Rav4 and Mercedes B-Class ED) have a single 10 kW OBC.
Rav4 EV has ~41.8 kWh battery. Many CHAdeMO DC FCs are only 44 kW at max. Wait. Why is it when a Rav4 EV w/JdeMO plugs in that it it can draw up to 48 kW even though it has a 41.8 kWh battery?
See how things can be confusing, if the wrong units are used? There was a great post on MNL (which I can't find) that made light of it and pointed out the importance...
And yes, I would correct someone in face to face conversation if they get it wrong. I'm pretty sure I have before on this very subject.
Take a look at the attached pics. Imagine the confusion if people were talking about charging rates, ramp down, etc. if they routinely mixed up kW and kWh (and had no notes nor pics).
powersurge wrote:For me, I will say that I love plugging in my "charger" (possibly EVSE) to top off my 24 "kWh" battery. Correct that.
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