Range anxiety is the biggest drawback to electric cars. When the battery is dead, so are you, perhaps miles from the nearest charger.
What if you could miraculously find extra miles in such a situation? Such a possibility is theoretically possible, says Indian electric carmaker Reva Electric Car.
Reva hopes to provide an emergency power system with its next generation electric car
According to the company, electric cars hold a certain amount of battery power in reserve to protect electrical systems, such as electrodes, and extend the life of the battery. This reserve can be as high as 30 percent of capacity.
So how do you draw on this extra juice in an emergency? An interesting post on the IEEE Spectrum blog explains how Reva is working on just such a system to give consumers access to their power reserves. It is not the only carmaker doing so. Daimler is testing a similar system, and Honda has one as well.
Reva says the procedure is complicated and needs to factor in numerous variables, such as daytime temperatures, a battery’s age, its recharge history and how aggressively a car has been driven. No algorithm can be easily adapted for every car.
Reva says its system (REVive) will remotely communicate with cars to retrieve operating data, store it for three years and compare it to the 84 million miles of driving data it has from other electric cars. When the need arises, the system checks the data and calculates how much power is available. Then it puts the car in a slow “limp” mode and a driver can drive to a charging station.
The danger is in draining a battery too frequently. Deep discharges can shorten battery life. But the damage is minimal if batteries are depleted only once in a while.
However, if this helps alleviate range anxiety and the fear of being stranded miles from home, it will do a wonderful service to the electric car industry. It will also fill up our airways with reams of routine operating data and give a boon and headache to cellular service providers.
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