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Under normal circumstances, you can only use about 18.4KwHr of energy from the 22KwHr battery...so assuming it was totally empty (the controller won't let you actually use all of it, nor will it let you charge it all the way up - only 18.4KwHr or so is what you can use)...you'd multiply 18.4Kw x your electrical costs. Note, the conversion isn't perfect...some of the energy will be lost to heat in converting the ACV to DCV to charge the car, so maybe throw in an extra 10%, or say 20KwHr * $0.2088 = $4.18 based on using a 240vac EVSE. It would probably be a bit less, as the conversion is better than that (I think, anyways). Note, if you use the 120vac EVSE that comes with the car, it will take more time and more money to recharge since the conversion to the 400VDC or so it must make to charge the batteries isn't as efficient.
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