2012 Mitsubishi i-MiEV: Still Charging After All These Hours
July 10, 2012
Our 2012 Mitsubishi i-MiEV has been plugged in continuously for exactly 12 hours now, and so far 10.27 kWh of juice has passed through the cord. And no, it's not full yet. I predicted 15 hours last night, and that's looking like a solid guess at this point.
Normal charging losses amount to 10-15%, so from the battery's point of view the i MiEV has taken on roughly 9 kWh in half a day, a 120V charge rate that works out to 0.75 kWh per hour of plug-in time.
Sharp-eyed math heads will notice the hour term cancels itself out, leaving us with 0.75 kW. But I don't think this simplifed unit is as self explanatory as saying 0.75 kWh of battery fill per hour of charge time.
In similar circumstances the Leaf charges at something like 1.15 kWh per hour (1.15 kW) and Honda's as yet unconfirmed Fit EV performance claims suggest an observed 120V charge rate of 1.3 kWh per hour (1.3 kW). The relative pecking order between the i MiEV and Leaf is much the same on 240V, but I don't have the appropriate test data just yet.
Still, it turns out one of the chief measures of EV performance has do with how fast they are when they're parked.
Dan Edmunds, Director of Vehicle Testing @ 1,371 miles