Understanding the Impact of Extreme Temperatures on Electric Vehicles
Just like humans, electric vehicle (EV) batteries perform best in moderate temperatures, specifically between 65 to 75 degrees Fahrenheit. When the weather gets too hot or too cold, the battery's efficiency drops, and it has to work harder to maintain a comfortable temperature for those inside the car.
This means that EVs might not be able to drive as far or as efficiently in extremely hot or cold weather.
Testing the Impact of Weather on EV Performance
Recent research has shown that extreme temperatures do have a significant impact on the performance of modern EV batteries. Hot weather reduced the range of EVs by an average of 8.5%, while cold weather reduced it by an impressive 39%.
Interestingly, similar tests conducted in 2019 with a different set of vehicles showed a comparable decrease in range in cold weather, while the loss in range during hot weather was higher at 17%. This suggests that improvements have been made in how EVs handle the heat.
However, when it comes to winter performance, there hasn't been much change since 2019. Despite advancements in technology, battery chemistry and more efficient EV designs, the cold weather impact on range has remained relatively constant.
Preparing for Weather Changes
These findings emphasize the importance of planning for weather changes when driving an EV. While EVs can still be a practical choice in hotter or colder climates, drivers should be aware of potential range loss, especially during winter. But with proper planning, these challenges can be overcome.
Behind the Scenes of Weather Testing
The research tests are conducted in a unique setting, inside a historic Spanish Revival-style building, where a room equipped with powerful heaters and coolers can simulate temperatures as low as 20 degrees Fahrenheit or as high as 95.
The centerpiece of this room is a chassis dynamometer, a type of automotive testing device that is essentially a treadmill for cars. A single vehicle is carefully parked on top of two large steel rollers and secured with heavy chains. The vehicle is then "driven" without actually moving, as the wheels turn the rollers for several hours. The aim is to determine how far the battery can go at a certain temperature.
Impact of Extreme Temperatures on Other Vehicles
The impact of cold weather isn't exclusive to EVs. Hybrid vehicles were also tested and experienced a nearly 23% average loss in fuel economy in 20 degrees F. Even traditional gas vehicles can experience a 10% to 30% drop in fuel economy in cold weather.
Overcoming the Weather Challenges
Despite the challenges, it's important to note that EVs are still a practical choice for many drivers, even in colder climates. Several strategies can help mitigate the impact of extreme temperatures:
- Select an EV that is known for dealing well with the temperatures in your region.
- Plan ahead. If you have a home charger and a typical commute, the reduced winter range probably won't affect your daily driving. But if you're going on a long trip, factor in range reduction when planning your charging stops.
- If you're fast-charging, try to do it on a warmed-up battery as charging is slower on a cold battery.
- Start your climate control while your vehicle is still plugged in. This way, you'll draw power from the grid, not your battery, conserving your vehicle's energy for the drive.
These strategies highlight that while extreme temperatures can affect the performance of EVs, with a bit of planning and understanding, they can be managed effectively.