Monday 7 February 2011

Electric Cars – The User Perspective

It is possible that in my lifetime all cars will be electric and even the classic cars of the past will have to be fitted with an electric motor to be allowed on the public road. There will remain petrol-head rallies where the gas guzzlers of the early 21st century are allowed to rev their engines and zoom off trailing smoke out of their exhausts. These will be nostalgic events like attending a steam rally with the smell of burning coal as the old traction engines chug around the showground. Modern cities do not have steam traction engines and in due course petrol or diesel cars will not be allowed.

Driving an electric car is a different experience to driving a petrol or diesel car. It is better in that it is quiet, clean and zippy. It is easy to make electric cars quick; high torque electric motors are small and deliver maximum torque throughout a wide range from spinning slowly to high rpm; that means no need for gears. The more power that is used the greater the drain on the battery. That leads on to the disadvantages; the range is limited to the capacity of the battery.

In cold winter weather, the range tumbles as the heater also draws power from the battery. More advanced models in the future may use heat pumps, in effect running the air conditioning in reverse, but the engineers have some catching up to do. Conventional cars now have plenty of waste heat and diverting it to heat the car is simple. There has been no need to have efficient electric heaters.

My experience of driving the E-mini for six months taught me how to live with an electric car. First, plan your journey to confirm that it is within range. Second, if the journey is close to maximum range and the weather is cold, dress up warm so you do not need the car’s heater. Third, if the return journey is outside the range you need a guaranteed place at the end of the outward leg to be able to recharge.

Most days I was driving well within its maximum range of about 90 miles. Provided the journeys are predominantly local range is not an issue. If you need to go on a long journey, hire a conventional car or go by train.

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