by drees (Posted Thu, 16 May 2013 22:56:50 GMT)
How fast can you charge? Are the stations 208 or 240V and is your LEAF 16 or 30A capable?
Anyway, here are some calcs making the following assumptions:
* 208V (commercial charging tends to be), let's just compare 16A/30A (3.3 kW, 6.2 kW).
* efficiency listed in the range chart for given speeds is correct
* Add data points for 25 / 30 mpg which where we will assume 6.8 mi/kWh for 30 mph and 7.3 mi/kWh for 25 mph.
* Assume 85% charging efficiency, 16A charging = 2.8 kW, 30A charging = 5.3 kW
* Assume 21 kWh usable energy in pack
* All numbers are rounded down
16A charging:
25 mph: 7.3 mi/kWh, 7.2 hr drive, 153 mi / charge, 20 mi/h charge rate, 27 mi charging, 1.4 hr charging = 8.6 hours
30 mph: 6.8 mi/kWh, 6.0 hr drive, 142 mi / charge, 19 mi/h charge rate, 38 mi charging, 2 hr charging = 8.0 hours
35 mph: 6.3 mi/kWh, 5.1 hr drive, 132 mi / charge, 18 mi/h charge rate, 48 mi charging, 2.7 hr charging = 7.8 hours
40 mph: 5.9 mi/kWh, 4.5 hr drive, 123 mi / charge, 16 mi/h charge rate, 57 mi charging, 3.5 hr charging = 8.0 hours
45 mph: 5.2 mi/kWh, 4.0 hr drive, 109 mi / charge, 14 mi/h charge rate, 71 mi charging, 5.0 hr charging = 9.0 hours
Looks like 35 mph is the fastest for this distance and charge rate.
30A charging:
30 mph: 6.8 mi/kWh, 6.0 hr drive, 142 mi / charge, 36 mi/h charge rate, 38 mi charging, 1.0 hr charging = 7.0 hours
35 mph: 6.3 mi/kWh, 5.1 hr drive, 132 mi / charge, 33 mi/h charge rate, 48 mi charging, 1.4 hr charging = 6.5 hours
40 mph: 5.9 mi/kWh, 4.5 hr drive, 123 mi / charge, 31 mi/h charge rate, 57 mi charging, 1.8 hr charging = 6.3 hours
45 mph: 5.2 mi/kWh, 4.0 hr drive, 109 mi / charge, 27 mi/h charge rate, 71 mi charging, 2.6 hr charging = 6.6 hours
50 mph: 4.6 mi/kWh, 3.6 hr drive, 96 mi / charge, 24 mi/h charge rate, 84 mi charging, 3.5 hr charging = 7.1 hours
Looks like 40 mph is the fastest for this distance and charge rate.
Faster charging lets you get there a bit faster, but +- 10 mph around the sweet spot doesn't make a huge difference in overall time.
How fast can you charge? Are the stations 208 or 240V and is your LEAF 16 or 30A capable?
Anyway, here are some calcs making the following assumptions:
* 208V (commercial charging tends to be), let's just compare 16A/30A (3.3 kW, 6.2 kW).
* efficiency listed in the range chart for given speeds is correct
* Add data points for 25 / 30 mpg which where we will assume 6.8 mi/kWh for 30 mph and 7.3 mi/kWh for 25 mph.
* Assume 85% charging efficiency, 16A charging = 2.8 kW, 30A charging = 5.3 kW
* Assume 21 kWh usable energy in pack
* All numbers are rounded down
16A charging:
25 mph: 7.3 mi/kWh, 7.2 hr drive, 153 mi / charge, 20 mi/h charge rate, 27 mi charging, 1.4 hr charging = 8.6 hours
30 mph: 6.8 mi/kWh, 6.0 hr drive, 142 mi / charge, 19 mi/h charge rate, 38 mi charging, 2 hr charging = 8.0 hours
35 mph: 6.3 mi/kWh, 5.1 hr drive, 132 mi / charge, 18 mi/h charge rate, 48 mi charging, 2.7 hr charging = 7.8 hours
40 mph: 5.9 mi/kWh, 4.5 hr drive, 123 mi / charge, 16 mi/h charge rate, 57 mi charging, 3.5 hr charging = 8.0 hours
45 mph: 5.2 mi/kWh, 4.0 hr drive, 109 mi / charge, 14 mi/h charge rate, 71 mi charging, 5.0 hr charging = 9.0 hours
Looks like 35 mph is the fastest for this distance and charge rate.
30A charging:
30 mph: 6.8 mi/kWh, 6.0 hr drive, 142 mi / charge, 36 mi/h charge rate, 38 mi charging, 1.0 hr charging = 7.0 hours
35 mph: 6.3 mi/kWh, 5.1 hr drive, 132 mi / charge, 33 mi/h charge rate, 48 mi charging, 1.4 hr charging = 6.5 hours
40 mph: 5.9 mi/kWh, 4.5 hr drive, 123 mi / charge, 31 mi/h charge rate, 57 mi charging, 1.8 hr charging = 6.3 hours
45 mph: 5.2 mi/kWh, 4.0 hr drive, 109 mi / charge, 27 mi/h charge rate, 71 mi charging, 2.6 hr charging = 6.6 hours
50 mph: 4.6 mi/kWh, 3.6 hr drive, 96 mi / charge, 24 mi/h charge rate, 84 mi charging, 3.5 hr charging = 7.1 hours
Looks like 40 mph is the fastest for this distance and charge rate.
Faster charging lets you get there a bit faster, but +- 10 mph around the sweet spot doesn't make a huge difference in overall time.