Buying An Electric Car: Why Charging Rate, DC Quick-Charging Matter

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NRG eVgo electric-car charging station

NRG eVgo electric-car charging station

We all know how to compare horsepower, acceleration, and gas mileage. Practical car buyers know to look at cargo volume, too.

But when it comes to buying your first electric car, there are a few things you need to know about charging.

Like the better-known measurements, the rate at which a plug-in car can charge its battery is a specification you should ask about before you sign on the line.

DON'T MISS: Electric Car Charging: The Basics You Need To Know

That's because the charging rate directly affects the time it takes for the car to recharge the battery to its full capacity, and hence its full rated range.

In broad strokes, if you're confident that you can charge your car at home every night--or at work every day--then recharge rate may not be quite so important.

But it could be more important to the next buyer, so we still advise being aware of the rate.

PowerPost Level 1 electric-car charging stations at Portland International Airport

PowerPost Level 1 electric-car charging stations at Portland International Airport

And whether a car offers the ability to use DC quick-charging stations, which are totally different from conventional 240-Volt "Level 2" charging, is always important.

DC quick-charging generally recharges the battery to 80 percent of its capacity in around 30 minutes, as compared to several hours on Level 2 charging. (That last 20 percent takes a lot longer.)

In other words, if you have the option, always go for an electric car with DC quick-charging--and if it's optional, tick that box.

ALSO SEE: Electric-Car Fast-Charging Networks: Competition Heats Up (Jan 2015)

120-Volt and 240-Volt charging

Rates for onboard chargers start at 3.3 kilowatts, which is the standard for 2011-2012 Nissan Leafs, later base-model Leafs, and all 2011-2015 Chevrolet Volts.

Eaton CHAdeMO DC quick charging station, Mitsubishi headquarters, Cypress, CA

Eaton CHAdeMO DC quick charging station, Mitsubishi headquarters, Cypress, CA

Later Leafs above the base model doubled that rate to 6.6 kW, and the 2016 Chevy Volt is up to 3.6 kW--which, GM says, is high enough to recharge its 18.4-kWh battery overnight even using a conventional 120-Volt household plug.

Most battery-electric cars will require a 240-Volt Level 2 charging station for overnight recharge, but a 24-kWh Leaf takes 9 hours for a full recharge at 3.3 kW but 5 hours or less at 6.6 kW.

As of this year, the Leaf now offers a 30-kWh battery as well, which will naturally take even longer to recharge. That's why the higher rate is more important for the Leaf.

MORE: Installing An Electric-Car Charging Station: This Old House Shows You How

European battery-electric cars like the BMW i3 and Volkswagen e-Golf have onboard chargers capable of rates up to 7.2 kW. Most plug-in hybrids, however, are sticking with the 3.3- or 3.6 kW rate.

And all of those vehicles except the Tesla Model S use the same connector, meaning that any 120-Volt or 240-Volt charging station with the expected connector can be used to charge them up.

DC quick charging

Things get more complicated with quick charging, for which there are three standards: CHAdeMO (used by the Nissan Leaf, Kia Soul EV, and Mitsubishi i-MiEV), CCS (used by all U.S. and German brands), and Tesla's Supercharger, which can be used solely by Tesla Model S and Model X vehicles.

While CHAdeMO had a head start in the U.S. market, most new DC quick-charging stations being installed today have one cable each for CHAdeMO and CCS.

Right now, just a handful of cars are sold in the U.S. using the CCS standard--the low-volume Chevy Spark EV and a few German models--but more will be coming over the couple of years, most notably the Chevrolet Bolt EV.

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