EV Charging in Commercial Buildings
As we know, unlike conventional vehicles, EVs require time to recharge. Depending on the battery size, charging infrastructure, and charging speed, an EV can take anywhere from four hours to as much as ten hours to charge fully, using AC charging.
Even with DC fast chargers available, which can reduce charging time to 15 to 30 minutes, the reality is that most EV drivers prefer to charge when they are already parked for extended periods. This is why EV charging is naturally shifting into the built environment: homes, office parks, shopping centres, hotels, and mixed-use developments.
Energy equation
This trend, however, introduces a major challenge for building owners and facility managers.
EV charging is not a small load; a single AC charger can demand up to 22kW. Multiply that by ten chargers in a commercial building, and the building’s electricity demand can jump dramatically.
Plus, if you add DC charging, buildings have to provide anywhere from 120kW to 720kW per charger, creating a level of demand that most existing building infrastructure is simply not designed to support without significant upgrades.
Higher and higher
If EV chargers operate without intelligence, they will simply draw power whenever vehicles are plugged in. As more drivers arrive and plug in, the load climbs higher and higher. Eventually, the building may exceed its subscribed maximum power.
This can trigger financial penalties, increased electricity costs, or worst-case scenarios: overloads that trip supply and cause blackouts, not only impacting the chargers but, worst case scenario, shutting down the entire building.
Missing link
This is where the ‘new energy landscape’” for buildings begins to take shape. EV chargers must become part of an integrated energy ecosystem, where the charger sits at the centre of multiple stakeholders:
- The building and its internal load profile.
- The electricity grid and its constraints.
- Distributed Energy Resources (DERs) such as solar PV and microgrids.
- And the EV drivers.
The future therefore depends on smart EV chargers that can communicate and coordinate across this system, ensuring charging remains smooth for drivers, while protecting the building from overload.
Load management
One of the most important capabilities enabling this future is dynamic load management.
In a building, there is always a maximum subscribed power limit. Smart load management ensures EV charging never pushes the building beyond this threshold.
Thus, instead of charging every vehicle at full power at the same time, a smart system monitors:
- The building’s real-time consumption.
- The available capacity remaining.
- The number of EVs currently charging.
When building consumption rises, the system automatically reduces charging power across vehicles, sharing the available energy intelligently. When consumption drops, the system increases charging power again, ensuring vehicles still charge efficiently, but without compromising the building.
Rise of microgrids
As EV chargers become embedded into buildings, the role of DERs becomes even more important. Microgrids, solar installations, and battery storage systems can support charging demand while improving resilience and reducing reliance on unstable grid supply, especially during peak periods or in regions where grid reliability remains a challenge.
The combination of EV charging, energy management systems, and distributed energy is what defines the emerging energy landscape for buildings: decentralised, flexible, digitally managed, and increasingly driver centric.
