More Charging Plugs Lead to Higher EV Charging Station Utilization, Kempower Study Reveals
A recent analysis highlights a pivotal factor in the efficiency of electric vehicle (EV) charging facilities: the quantity of available charging connectors. This research suggests that increasing the number of charging points plays a more substantial role in boosting site usage than merely enhancing the overall power capacity. The findings underscore a shift in focus for infrastructure development, emphasizing broad accessibility over raw power figures.
Detailed Report on EV Charging Infrastructure Effectiveness
Finnish EV charging solutions provider, Kempower, recently released North American data derived from its ChargEye cloud software. The study's core revelation is that the number of charging plugs at public EV charging locations has approximately three times the correlation with site utilization compared to the total installed charging power. This indicates that offering more connection points to electric vehicle drivers proves more effective than installing fewer, high-power chargers.
Specifically, Kempower identified a correlation of 0.63 between the number of plugs and site utilization, contrasting sharply with a correlation of merely 0.228 between installed power and utilization. Data showed that sites equipped with eight plugs delivered more than double the energy (128,342 kWh) compared to those with four plugs (61,453 kWh). Jed Routh, Vice President of Markets and Products for Kempower North America, commented on these findings, stating that public charging is increasingly becoming a challenge of infrastructure utilization rather than just power deployment. He emphasized that enabling more vehicles to access charging and intelligently distributing available power can significantly enhance the effectiveness of charging infrastructure for operators.
Kempower's innovative distributed charging system links multiple connectors to a central power unit. Its software dynamically allocates available power among vehicles in 25 kW increments, adapting to each EV's real-time charging requirements. For instance, if an EV's charging demand decreases from 250 kW to 100 kW, the system re-routes the surplus capacity to another vehicle, preventing idle power. When sufficient capacity is available, a single vehicle can receive up to 320 kW. The company reports that public charging sites employing this distributed charging model achieved 83% higher utilization rates than those with fixed-power dispensers. Their analysis pinpoints approximately 100 kW of available power per plug as the optimal balance when all connectors are in use. This approach enables charging operators to expand their plug count without needing to invest in excessive grid capacity to simultaneously deliver maximum advertised speeds to every connector. While the study's precise methodology regarding the number of sites, observation period, and control for variables like location and pricing was not fully detailed, the practical implications align with observed EV charging behaviors, where vehicles rarely sustain peak charging rates throughout a full session. By spreading power across more plugs, operators can cater to a larger volume of drivers, optimizing resource allocation and potentially reducing infrastructure costs.
The insights provided by Kempower's research offer a crucial perspective for the ongoing development of electric vehicle charging infrastructure. It challenges the conventional wisdom that 'more power equals better,' instead highlighting the paramount importance of accessibility and intelligent power distribution. For urban planners, energy providers, and automotive manufacturers, this data suggests a strategic pivot towards designing charging stations that prioritize a higher density of connection points. Such an approach could alleviate range anxiety, reduce waiting times, and ultimately accelerate the adoption of electric vehicles by making the charging experience more efficient and user-friendly. This study serves as a valuable guidepost, encouraging a more nuanced and demand-responsive strategy in building out the future of EV charging networks.