All-Electric Vehicles (EVs): The environmental benefits of plug-in hybrids and electric vehicles increase if they are powered by electricity from green sources such as solar, wind or small-scale hydroelectricity. All-electric vehicles (EVs) run on electricity only. They are propelled by an electric motor (or motors) powered by rechargeable battery packs. EVs have several advantages over vehicles with internal combustion engines (ICEs): Energy efficient. Electric vehicles convert about 59–62% of the electrical energy from the grid to power at the wheels—conventional gasoline vehicles only convert about 17–21% of the energy stored in gasoline to power at the wheels.* Environmentally friendly. EVs emit no tailpipe pollutants, although the power plant producing the electricity may emit them. Electricity from nuclear-, hydro-, solar-, or wind-powered plants causes no air pollutants. Performance benefits. Electric motors provide quiet, smooth operation and stronger acceleration and require less maintenance than ICEs. Reduce energy dependence. Electricity is a domestic energy source. EVs do, however, face significant battery-related challenges: Driving range. Most EVs can only go about 100–200 miles before recharging—gasoline vehicles can go over 300 miles before refueling. Recharge time. Fully recharging the battery pack can take 4 to 8 hours. Even a quick charge to 80% capacity can take 30 min. Battery cost: The large battery packs are expensive and may need to be replaced one or more times. Bulk & weight: Battery packs are heavy and take up considerable vehicle space. However, researchers are working on improved battery technologies to increase driving range and decrease recharging time, weight, and cost. These factors will ultimately determine the future of EVs.
Posted on: Fri, 22 Aug 2014 01:56:09 +0000
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