Ok. Dumb Question alert! Sorry in advance…If a L2 EVSE delivers 20kw per hour, and an ER Mach E has roughly a 90kw battery, shouldn’t it only take roughly 4.5hrs to fully charge the car?Electricity is charged per KiloWatt-Hour(kWh) which is total Energy consumed. Power is rated in kW which is the product of Voltage and Amperage (current flow). To get your 3 kW on 110 VAC would require a 30 Amp circuit and plug. Most homes top out at 20 Amp receptacles and single-pole breakers. With a 20 Amp circuit, you might see a 2 kW charging rate.
So, to use your examples, using the standard 110 wall outlet and a 2 kW charge rate for 5 hours, you would use 10 kWh. Using an L2 EVSE that can deliver 20 kW of power for one hour is 20 kWh. You get twice as much energy transferred into your EV with the L2 charger in 20% the time. If you have a long commute this can be the difference between being able to charge overnight or having to DC Fast Charge outside your home to make up the difference.
The electric motors in any electric vehicle are rated in Horsepower or kW. Battery packs are rated in kWh. If your EV has 400 kW motors and a 100 kWh Battery Pack, you could theoretically get 15 minutes of full power from the motors before exhausting the charge in your EV. Since we don’t drive at 100% full throttle for more than a few seconds, you get more than that quarter-hour of potential energy from your fully charged EV.
I’ll agree with that! Having an L2 EVSE and 240 VAC available where you park overnight allows you to take the best advantage of the time the off-peak rate is available.
If I get electricity for .10 a kw, and my battery is 90kw, then wouldn’t it only cost $9 to charge my MME from 0% to 100%?