UC San Diego now has 550 charging ports. Credit: Erik Jepsen/University Comunications
The study improves upon existing computational models, which rely on average data or guesswork. That’s because it incorporates the real reported and observed habits of the drivers that the charging network is designed to serve.
“We have demonstrated that using data from real EV drivers—rather than relying on idealized or regionally-averaged assumptions—can have a significant impact on the optimal design of a charging network,” said Myers, who earned his Master of Public Policy from the UC San Diego School of Global Policy and Strategy in 2023.
EV drivers tend to plug in when they have less than 60% of battery left
For example, the team discovered that existing systems for planning EV infrastructure aren’t much informed about how people actually charge their EVs when they are away from home.
At UC San Diego, the team has learned that drivers charge their vehicles more frequently than previously assumed. A key discovery in the study was that drivers have a tendency to charge their cars when they have plenty of battery left—on average, they don’t like to fall below 60%.
With these results in hand, the new study estimates that using individual drivers’ behavior instead of national averages could triple the size of the network needed to fully support workplace charging. This has big implications for the cost and design of workplace charging networks. It also underscores the importance of workplace charging policies and managed charging, which dynamically adjust how the vehicle is charged to meet the needs of both the driver and electric grid. If well implemented, policies and managed charging can encourage more efficient use of the network and push down the higher number of the needed chargers that the study finds.
The researchers plan to make their computational model publicly available so institutions, like universities or businesses, can design charging networks that meet the needs of their employees while keeping costs down.
“The study shows that if workplaces take the time to understand how their employees use their electric cars and charge them, they can create charging networks that are more cost-effective, more efficient and better for the environment,” said Teevrat Garg, an associate professor of economics at the School of Global Policy and Strategy and co-author of the study.
