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J1772 Charging Rates

I am about to take my first multi-day road trip and will need, at various points, to charge on "J1772" outlets listed in Plug Share. Whatare the actual charging rate I can expect?

I know that in the case of NEMA 14-50 and HPWC outlets, the actual charging rate (Miles of Charge/Hour) depends on voltage. And I have seen 208 volts at a shopping center vs 220 or 240 in residential settings.

I have an MS85 with Dual Chargers.

I have membership cards for Blink and Charge Point, if there are differences between networks.


Roadster#433, Model S#S37
Feb 27, 2009
Because the AC charger is only about 90% efficient, the MS needs about 333 Wh/mi, rated miles. This means that the charging rate in MPH is close to kW*3mph/kW.

Many J1772 chargers are 30 Amps at 208 or 240 Volts.
  • 30A*208V=6.24kW; 6.24kW*3mph/kW=18.7 mph charging.
  • 30A*240V=7.2kW; 7.2kW*3mph/kW=21.6 mph charging.

Because you had the foresight to buy dual chargers, you can charge at over 40 Amps AC. When you find HPWC's or J1772's with more than 40 Amps, you will be happy. For example, both Pagosa Springs, CO and Salida, CO have 70 Amp J1772 connections at 240 Volts. 70A*240V=16.8kW; 16.8kW*3mph/kW=50.4 mph charging.


Supporting Member
Dec 28, 2007
You also can use RV parks. Check RVParking.com for locations. Call ahead for EV charging availability and ask for "50 Amp service."

With a UMC this will be much faster than the typical 30 A J1772.


PS. Also try seting PlugShare filters to show only Model S HPWCs ("gear" icon for settings). You could charge at 80 A (60 mph)! There is a 14-50 filter as well. Lots of options in and around Georgia.
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