Umair Gaines
Electric vehicle (EV) range is a hot topic, and for a good reason. Range is the all-important stat that determines whether you can make it to the next charging spot, complete your daily commute, or are left stranded. It is a critical factor when considering a switch to EVs, especially for commercial buyers. While car manufacturers provide official figures based on standardised cycles, there are several factors that influence the range of an electric vehicle in the real world. These include battery size, vehicle size and aerodynamics, battery heating efficiency, outside temperature, and driving style.
| Characteristics | Values |
|---|---|
| Main determining factor | Battery size, measured in kWh |
| Other factors | Vehicle size, aerodynamics, battery heating efficiency, outside temperature, driving style, use of air conditioning and heating |
| Standardised cycle | WLTP or WLTC cycle (includes RDE cycle in real-life operation in addition to the WLTC laboratory cycle) |
| EPA ratings | The Environmental Protection Agency (EPA) provides efficiency ratings and range estimates for every electric vehicle |
| Edmunds testing | Edmunds conducts real-world EV range testing, akin to miles per gallon (mpg) for fuel-burning vehicles |
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What You'll Learn
Battery size and capacity
The range of an electric vehicle is largely determined by the capacity of its battery. The bigger the battery, the more charge it can hold, and the further the vehicle can travel. Electric vehicles typically have batteries ranging in capacity from 50 kWh to 100 kWh, with larger vehicles like pickup trucks and SUVs utilising batteries as large as 200 kWh. The usable capacity of a battery is also important, as batteries can lose capacity over time due to wear and tear from charging cycles.
The energy density of the battery is another key factor in determining the range of an electric vehicle. This refers to the amount of electricity that can be stored in the battery, and the higher the energy density, the greater the potential range of the vehicle. However, it's worth noting that the usable energy of the battery is typically limited by the manufacturer to around 70% to maintain battery health.
The efficiency of the vehicle also plays a role in range. A more efficient car will be able to travel further on the same battery capacity. Efficiency can be influenced by various factors, such as driving habits, terrain, and weather conditions. For example, frequent full-throttle acceleration and driving uphill can reduce the range, while regenerative braking and driving on flat roads can help maximise it.
Additionally, the state of the battery can impact the range. A warmed-up battery will regenerate better than a cold one, so preheating the car while it's still plugged into the charging station can help improve range. Similarly, using the seat heater instead of the climate control to warm the interior can preserve battery power.
It's also important to consider the charging infrastructure when calculating the range of an electric vehicle. While a full charge may provide a certain estimated range, the availability of charging stations can impact how far the vehicle can realistically travel.
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Driving style and conditions
The range of an EV is also influenced by the driving conditions, such as the type of road and terrain. For instance, driving uphill, towing, or hauling heavy loads can decrease the efficiency of the vehicle and reduce the range. The efficiency of an EV is often compared to that of a gasoline car, which typically has a higher range. The miles per gallon (MPG) or miles per gallon equivalent (MPGe) ratings are commonly used to compare the efficiency of different vehicles.
Environmental factors, such as outside temperature and weather conditions, can impact the range of an EV. The traction battery's performance can be affected by temperature, and the need for heating or cooling the interior of the vehicle can further influence the range. This is similar to the impact of temperature on the miles per gallon performance of internal combustion engine (ICE) vehicles. The outside temperature and weather conditions can vary significantly between different regions, which can make it challenging to determine a standard range for EVs.
It is important to note that the range of an EV is not solely dependent on the battery size or capacity. While a larger battery generally provides a longer range, other factors such as driving style and conditions can significantly impact the actual range achieved. This deviation between the stated range and the actual range experienced by drivers has led to discussions about the "realistic" figures provided by car manufacturers. The practical range of an EV depends on various factors, and it can be challenging to predict or control all these variables.
To address this challenge, organisations like DriveElectric provide a 'real world' range estimate in addition to the manufacturer's official WLTP (Worldwide Harmonised Light Vehicles Test Procedures) range figures. The WLTP cycle includes both a laboratory test (WLTC) and a practical driving test (RDE) to better reflect the real-world conditions and range expectations for EV users. Edmunds, an independent testing organisation, also conducts real-world EV range testing to provide more accurate estimates for consumers. These tests consider factors such as driving behaviour, road conditions, and environmental variables to offer a more comprehensive understanding of EV range capabilities.
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Charging infrastructure
The transition to electric vehicles (EVs) requires a robust charging infrastructure, with charging stations (CSs) supported by information technology and distributed energy generation units. The planning and implementation of charging station infrastructure are crucial to enabling the widespread adoption of EVs.
The charging infrastructure industry has adopted the Open Charge Point Interface (OCPI) protocol, which provides standard terminology for describing charging infrastructure components. These include the station location, EV charging port, and connector. A station location refers to a physical place with one or more EV charging ports, such as a parking garage or lot. An EV charging port, also called a charger, provides power to charge a single vehicle at a time, even with multiple connectors. The charging post or unit can house one or more charging ports.
Charger Types and Speeds
There are different types of chargers available for EVs, including Level 1, Level 2, and direct current fast charging (DCFC) options. Level 1 chargers utilise a standard 120V AC outlet and are typically used in residential settings, but they can take a long time to charge an EV, ranging from 40 to 50+ hours for a BEV and 5 to 6 hours for a PHEV. Level 2 chargers offer higher-rate AC charging with 240V in residential or 208V in commercial applications and are commonly found in homes, workplaces, and public spaces. They significantly reduce charging times, taking 4 to 10 hours to charge a BEV and 1 to 2 hours for a PHEV.
DCFC, also known as Level 3 charging, provides rapid charging along heavy traffic corridors, with power outputs up to 500 kW. These chargers can charge a BEV to 80% in just 20 minutes to 1 hour. However, most PHEVs on the market are not compatible with fast chargers. It is important to note that charging speed can be influenced by various factors, including the charger manufacturer, temperature, vehicle battery capacity, and vehicle age and condition.
Charging Station Development
The development of charging stations is supported by various programs and grants. In the United States, the National Electric Vehicle Infrastructure (NEVI) Formula Program aims to establish a network of 500,000 high-speed EV chargers by 2030, allocating $5 billion in grants to states' departments of transportation. The Alternative Fueling Station Locator helps users find public and private charging stations, and federal funding initiatives, such as the National Electric Vehicle Infrastructure Formula Program and the Charging and Fueling Infrastructure Grants, are driving the expansion of EV charging options.
Challenges and Opportunities
While the EV charging industry faces challenges, including technological gaps and policy uncertainties, it also presents opportunities for a diverse range of players. Companies like ChargePoint Holdings, Blink Charging, and EVgo offer infrastructure hardware, software, and services, while also supporting third-party operators. The growth in EV sales indicates that range anxiety is becoming less of an issue for consumers, and the advancement of vehicle technology will enable faster charging in the future.
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Environmental factors
One of the most significant environmental factors is temperature. Extreme temperatures, both hot and cold, can impact battery performance and, consequently, the range of an EV. In cold climates, the chemical reactions within the battery slow down, reducing the battery's ability to deliver its full power. This results in a decrease in the available range. Similarly, high temperatures can increase the internal resistance of the battery, leading to reduced performance and range. To mitigate these effects, many EVs have thermal management systems that regulate the battery temperature, ensuring optimal performance even in extreme weather conditions.
Terrain and driving conditions also contribute to the environmental factors affecting EV range. Driving uphill or on steep inclines requires more energy from the battery, reducing the overall range. Similarly, driving on rough or uneven surfaces can decrease the efficiency of the electric motor, leading to higher energy consumption and a subsequent reduction in range. In contrast, driving on flat, smooth surfaces at constant speeds tends to maximize the range of an EV.
Weather conditions, such as headwinds, rain, or snow, can also impact EV range. Strong headwinds increase the aerodynamic drag on the vehicle, requiring more energy to maintain speed and reducing the available range. Additionally, driving through deep water or snow can increase the rolling resistance of the tires, resulting in higher energy consumption. Wet or snowy roads may also require the use of heating systems, such as defrosters and heated windscreens, which draw power from the battery, further reducing the range.
The weight of the vehicle and the load it carries are additional factors that influence EV range. The heavier the vehicle and its cargo, the more energy is required to propel it forward. This is especially noticeable when driving on routes with varying elevations, as the extra weight requires more energy to climb hills or inclines. Therefore, it is essential to consider the weight of any additional equipment, passengers, or cargo when estimating the range of an EV.
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Manufacturer and EPA testing
Electric vehicle (EV) range is a highly discussed topic, and car manufacturers are obliged to report the range of their electric vehicles. The range is determined by the battery size, measured in kilowatt-hours (kWh). The higher the kWh figure, the more miles the vehicle will be able to travel on a single charge. For example, the MINI Electric Level 1 has a range of 144 miles, while the Tesla Model S Long Range can go up to 379 miles on a full charge.
The range figures provided by car manufacturers are based on a standardised cycle, similar to that used for combustion engines. The Worldwide Harmonised Light Vehicles Test Procedures (WLTP) is the current standard for determining the range of electric vehicles. It includes both the laboratory WLTC (Worldwide Harmonised Light-duty Vehicle Test Cycle) and a practical driving test known as RDE. The WLTP standard aims to better reflect the real-world performance that drivers can achieve by considering factors such as higher speeds, a higher average speed, and the actual weight of the vehicle.
In the United States, the Environmental Protection Agency (EPA) is responsible for efficiency ratings and provides range estimates for all electric vehicles. The EPA conducts its testing using a dynamometer ("dyno"), a set of rollers on which a car can be driven while stationary. The EPA uses a carefully designed set of cycles that include speeding up, slowing down, stopping, and maintaining prescribed speeds. They test vehicles on both "city" and "highway" cycles, simulating stop-and-go traffic and higher-speed cruising. The total distance travelled is then multiplied by a correction factor determined by the EPA to reflect real-world expectations more accurately.
While the EPA provides valuable range estimates, it is important to note that they do not test EV range in real-world conditions. The laboratory-based nature of EPA testing may not fully capture the complexities of real-world driving, where factors such as driving style, weather conditions, and vehicle features can significantly impact the range. This is where independent organisations, such as Edmunds, step in to provide real-world EV range testing, offering a more practical perspective on electric vehicle performance.
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Frequently asked questions
The range of an electric vehicle (EV) is how far it can travel on a full charge.
The range of an electric vehicle is determined by its battery size, vehicle size, aerodynamics, battery heating efficiency, outside temperature, and driving style. The Environmental Protection Agency (EPA) in the US provides a range estimate for every electric vehicle based on laboratory testing. Edmunds, on the other hand, conducts real-world testing of electric vehicles to provide more realistic range estimates.
The EPA uses a set of cycles, including the Urban Dynamometer Driving Schedule (UDDS) and the Highway Fuel Economy Driving Schedule (HWFET), to simulate city and highway driving conditions. The vehicle is driven on a dynamometer, a set of rollers that allow the car to be "driven" while stationary, through a mix of city and highway routes until the battery is depleted. The total distance traveled is then multiplied by a correction factor to reflect what drivers can expect in the real world.
When determining the range of an electric vehicle for your needs, consider the battery size, efficiency, and driving conditions. By understanding these factors, you can calculate the range and plan your trips accordingly. Additionally, consider the availability of charging stations along your intended routes.
