Jun 02

ViriCiti industry report finds that fast chargers are underutilized in 24% of opportunity charging sessions

June 2021, Amsterdam – Around a quarter of all opportunity charging sessions start when the battery is already over 80% charged, according to the latest industry report released by ViriCiti. 

Considering the charging power decreases as battery state-of-charge (SoC) goes up, with a sharp inflection point at around 80% SoC, this means that 24% of opportunity charging sessions don’t use the fast chargers at their full capacity. This well-known phenomenon happens because the BMS (Battery Management System) reduces the charging power to avoid overheating the battery cells. 

Furthermore, the report shows that the average duration of an opportunity charging session is close to 26 minutes, with an average energy charged of 69.8 kWh. Operators also seem to start charging their buses on-route at an already high SoC level averaging at approximately 64%.

Table: Start SoC for analyzed charging sessions

Operators can get more out of their electric buses

The results also indicate that there is room for a more efficient driving of electric buses, which would mean lower starting SoC and faster charging rates, leading to shorter charging sessions and better on-route recovery.

Intelligent telematics systems like ViriCiti’s help operators use existing charging infrastructure more efficiently, prioritizing chargers based on itinerary, lowering demand costs through peak shaving, and decreasing energy costs by shifting charging times to lower energy tariffs.

Over 40,000 charging sessions analyzed 

ViriCiti connects to more than 1200 charger connectors (plugin & pantograph) across the world and has registered almost 3 million charging transactions from over 1000 vehicles since 2018. 

The resulting report is the product of meticulous research that was fine-tuned over several months. Over 40,000 charging sessions from 190 charging stations were analyzed. The full report is available on our reports page.


ViriCiti started in 2012 with a focus on electric buses and trucks and is now market leader in the United States and Europe, with over 3500 buses and chargers connected to its platform. The company is working with over 200 OEMs and fleet operators worldwide and aims to accelerate the adoption of electric vehicles by offering an all-in-one solution for full-electric as well as mixed fleets. In October 2020 they launched the largest Smart Charging project in the world, possibly outside of China.

About The Author

Cristiana Stoian, Communications Manager and ViriCitizen