"The 12kw battery would cost 12*0.16 = $1.92 however because of efficiency, as it takes 5 hours at 15amps (5*(15*230))) =17kw was used which = 17*0.16 = $2.76 to fully charge from empty."
Actually, this PHEV limits discharges to ~70-75% of the capacity of the 12KW battery pack so that a full...