For businesses and fleet operators transitioning to electric vehicles (EVs), power constraints can be a significant hurdle. The demand for commercial EV charging is growing, yet many sites lack the electrical capacity to support multiple chargers without modifications. However, a lack of available power doesn’t necessarily mean EV charging is unfeasible—there are various solutions to optimise existing infrastructure and manage energy efficiently.
This blog explores why power constraints occur, how to assess your available capacity, and the practical steps businesses can take to implement EV charging without costly grid upgrades.
Understanding Power Constraints for Commercial EV Charging
EV charging infrastructure requires sufficient electrical capacity, measured in kilowatts (kW), to operate efficiently. The power required depends on several factors:
- Charger type: Fast chargers (7-22kW) and rapid chargers (50kW+)
- Fleet size and number of simultaneous charging sessions
- Peak operational hours and existing site demand
Commercial sites—especially warehouses, logistics hubs, and large workplaces—often have high existing energy consumption. This can lead to limited spare capacity for EV chargers without careful energy management.
How to Assess Your Available Power Capacity
Before installing EV chargers, businesses should determine their available electrical capacity by following these steps. If you do not have a registered electrician on site we recommend speaking to a consultant or your chosen installer:
- Check Your Electrical Supply:
- Most commercial properties have a three-phase (400V) supply, but available capacity varies.
- Sites with large machinery or energy-intensive operations may already be near their capacity limit.
- Review Your Peak Demand Usage:
- Analyse your electricity bills or smart meter data to identify peak loads.
- Conduct a load assessment.
- Request a Capacity Check from Your Distribution Network Operator (DNO):
- DNOs can confirm how much additional power is available and whether an upgrade is needed.
Solutions for Limited Power Supply
If a site lacks sufficient power for EV charging, businesses can explore the following solutions:
1. Load Management Systems
- Distributes available power dynamically among charging stations.
- Prevents overloading by prioritising energy for essential business operations first.
- Enables multiple chargers to operate within existing electrical constraints.
2. Scheduled or Off-Peak Charging
- Charging fleet vehicles overnight or outside peak business hours.
- Reduces strain on the grid and may lower electricity costs under time-of-use tariffs.
3. Battery Energy Storage Systems (BESS)
- Stores electricity during low-demand periods and discharges when charging demand spikes.
- Supports high-power charging sessions without requiring grid upgrades.
4. On-Site Renewable Energy Integration
- Solar PV and wind turbines can generate electricity for EV charging.
- Reduces dependency on the grid and can lower long-term energy costs.
5. Electrical Supply Upgrades
- Involves requesting additional capacity from the DNO.
- While costly, it may be necessary for high-demand fleet operations.
Cost Considerations and Funding Support
Implementing power-efficient EV charging solutions comes with costs, but businesses can take advantage of funding options:
- Workplace Grants: these grants provide between £350 – £500 or up to 75% of installation costs (for UK businesses).
- Government and Local Authority Grants: Some councils offer additional funding for EV infrastructure improvements.
- Private Sector Incentives: Certain energy providers and leasing companies offer incentives for commercial EV charging.
TL;DR
Many commercial sites lack sufficient power for EV charging, but solutions exist. Businesses should assess their electrical capacity, implement load management, consider off-peak charging, and explore battery storage or renewables. If needed, a supply upgrade can be arranged through the DNO, though grants and incentives may help with costs. Smart energy management ensures fleet electrification remains viable despite power limitations.