Fleet EV charging: what every fleet manager needs to know.
Where to start with fleet EV charging
Most fleet managers approaching EV charging for the first time start in the wrong place: they look at charger hardware before understanding their own duty cycle. The right starting point is two questions:
- How many vehicles need to charge per 24-hour period, and for how long are they parked?
- Where do vehicles park overnight: at a central depot, at drivers' homes, or a mixture?
The answers determine whether you need depot charging, home charging, or both — and what charger speed is actually required. Installing 50kW rapid chargers at a depot where vehicles sit for 10 hours overnight is a common and expensive mistake.
Depot charging vs home charging for fleets
Which charger speed does a fleet actually need?
For most UK fleet depots where vehicles park overnight, 7kW AC chargers are sufficient. Here is the reasoning:
| Vehicle type | Typical battery | Time to charge at 7kW | Verdict |
|---|---|---|---|
| Electric car (e.g. VW ID.3 58kWh) | 58kWh | ~8 hrs | 7kW overnight: fine |
| Small electric van (e.g. Renault Kangoo E-Tech 45kWh) | 45kWh | ~6.5 hrs | 7kW overnight: fine |
| Medium electric van (e.g. Ford E-Transit 68kWh) | 68kWh | ~10 hrs | 7kW works if >10hrs parked |
| Large electric van (e.g. Mercedes eSprinter 113kWh) | 113kWh | ~16 hrs | Consider 22kW or DC rapid |
| Electric HGV / coach | 300kWh+ | 43hrs+ at 7kW | DC rapid or overnight AC multi-phase required |
For large-battery vans or fleets with multiple shifts requiring mid-day recharging, 22kW AC three-phase chargers halve the charge time but require a three-phase supply to the depot (most commercial premises already have this). DC rapids are warranted only for vehicles that must turn around in under two hours.
Load management: fitting within your DNO connection
The biggest infrastructure challenge for fleet depots is not the chargers: it is the electrical supply. Most depot buildings have a DNO (Distribution Network Operator) connection sized for their existing equipment. Adding 20 × 7kW chargers would add 140kW of potential load: often more than the existing supply can handle.
There are three ways to address this:
- DNO supply upgrade: request a larger connection from your DNO. Lead times are 3–18 months and costs are £10,000–£100,000+ depending on how far from an adequate substation you are. Essential for large depots but slow.
- Smart load management software: deploy chargers within your existing supply capacity, with software dynamically allocating available power. If 20 vehicles are parked for 10 hours, you do not need all 20 to charge at full speed simultaneously. Software ensures all vehicles reach their target charge within the available time, using the existing supply. The most cost-effective short-term approach.
- On-site battery storage: a commercial battery system stores grid electricity during low-demand periods and releases it during peak charging. Reduces peak demand charges and can bridge gaps between supply capacity and charging demand. Highest upfront cost but can pay back over 5–10 years through demand charge reduction.
For most fleets starting out, smart load management with existing supply capacity is the right first step. Plan the DNO upgrade in parallel if you anticipate significant fleet growth.
Charge management software for fleets
For fleets with more than a handful of vehicles, charge management software turns a collection of chargers into an integrated system. Key capabilities:
- RFID or app-based access control: ensures only authorised vehicles use depot chargers, with session data logged per vehicle or per driver.
- Dynamic load balancing: allocates power across active chargers within the site's supply limit, prioritising vehicles with the lowest state of charge or the earliest departure time.
- Fleet reporting: kWh per vehicle, cost per vehicle, charging behaviour, vehicles that did not reach target charge. Essential for understanding total fleet energy cost.
- HMRC-compliant mileage reimbursement: for home chargers, some platforms generate the data needed to reimburse employees accurately at the HMRC Advisory Electric Rate (9p/kWh).
Platforms commonly used in UK fleet charging include ChargePoint, Ohme for Business, Monta, Zaptec, and FleetCheck. Your installer will advise on which integrates with the hardware they fit and your existing fleet management system.
Grants available for fleet EV charging
UK fleet operators can access the same grants as other businesses:
| Grant | Value | Who it applies to | Max claim |
|---|---|---|---|
| Workplace Charging Scheme (WCS) | £350/socket (75% of cost) | All UK businesses with employee/fleet parking | 40 sockets (£14,000) |
| Electric Vehicle Infrastructure Grant | 75% of installation costs | Landlords and housing providers with shared parking | Separate scheme |
For fleet depots needing more than 40 sockets, only the first 40 attract the WCS grant. The remainder are funded without grant support, but still qualify for capital allowances (AIA) on the full cost. See our employer's guide to workplace EV charging for the full WCS application walkthrough.
A phased rollout approach for fleets
Most fleet managers find it less risky and more practical to roll out charging infrastructure in phases rather than installing everything at once. A typical three-phase approach:
- 01Pilot phase (5–10 vehicles)Install chargers for your first EV cohort. Assess real-world range, duty cycle, and charging behaviour. Identify any supply constraints. This phase is fully covered by the WCS grant (5–10 sockets × £350).
- 02Site expansion (up to 40 sockets total)Scale to match your planned EV uptake over the next 1–2 years. Use data from the pilot to refine your charger count and load management configuration. Remaining WCS vouchers cover this phase.
- 03Full fleet transition and supply upgradeBy phase 3, you have real data on peak demand and can make an informed case for a DNO supply upgrade if needed. At this point you also have HMRC mileage and energy data for fleet cost accounting.
Common questions
Get a fleet EV charging quote
Tell us your fleet size, vehicle types, and whether you need depot or mixed charging. Our OZEV-authorised installers advise on the right setup and handle WCS grant paperwork.