BMW i Forums - View Single Post - How Much Does It Cost To Charge From Empty ---> Full ?

Boatguy · 09-13-2014, 11:29 PM

The amount of power to refill the battery is well established at about 18kWh so with a charge efficiency factor of 80% you would need to buy 22.5kWh. The rate depends on where you live and your rate structure. The optimal rate in northern California (PG&E) is a little less than $0.10 / kWh when charging 11pm - 7am. So that would be $2.20 for a full charge.

Obviously the EPA is using a much higher rate for electricity. Using the optimal PG&E rates and $4/gal of gas would produce an MPGe of around 142. Amazing how far we've come from the Detroit gas guzzlers that got 12mpg and I'm sure all the EV manufacturers think they can do better!

09-13-2014, 11:29 PM	#6
Boatguy New Member 0 Rep 9 Posts Drives: i3 on order Join Date: Aug 2014 Location: San Francisco iTrader: (0)	The amount of power to refill the battery is well established at about 18kWh so with a charge efficiency factor of 80% you would need to buy 22.5kWh. The rate depends on where you live and your rate structure. The optimal rate in northern California (PG&E) is a little less than $0.10 / kWh when charging 11pm - 7am. So that would be $2.20 for a full charge. Obviously the EPA is using a much higher rate for electricity. Using the optimal PG&E rates and $4/gal of gas would produce an MPGe of around 142. Amazing how far we've come from the Detroit gas guzzlers that got 12mpg and I'm sure all the EV manufacturers think they can do better! Last edited by Boatguy; 09-13-2014 at 11:38 PM..
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