How long does an EV take to charge at your business?

Charging time depends on the energy needed and the average power the vehicle actually accepts. Energy Saving Trust notes that rapid charging can slow above 80% battery charge [S1]. Divide kilowatt-hours needed by average kilowatts for an initial estimate, then allow for losses, power sharing and time to start the session. Checked October 2026.

Last checked 16 October 2026

How long does it take to charge an EV at a charging station?

There is no single time that applies to every electric vehicle (EV). Start with the energy the driver wants to add, then consider the rate the vehicle and charger can sustain. Energy Saving Trust gives the basic method as energy divided by charging power [S2].

A kilowatt (kW) measures power, or the rate of energy delivery. A kilowatt-hour (kWh) measures energy. For example, a battery’s kWh capacity tells you its energy capacity, while the charger’s kW label describes its power rating [S2]. The kW versus kWh guide explains the units in more detail.

For your business, the useful question is usually how much energy a driver needs before leaving. A visitor may want a top-up, while your delivery van may need enough energy for tomorrow’s work. Neither requirement necessarily means charging an empty battery to full.

Alternating current (AC) charging relies on conversion inside the vehicle. Direct current (DC) charging uses conversion equipment outside it. Check the vehicle’s acceptance for each type separately [S2].

How do battery size and charger speed affect the calculation?

Use this illustration, not a quote or a measured vehicle test. Assume the usable battery sizes below, a start at 20% and a finish at 80%. That means adding 60% of usable capacity. Assume constant accepted power, no conversion losses and no time spent connecting, paying or waiting. Values are calculated and rounded.

The method follows Energy Saving Trust’s energy/power equation [S2]. For the middle battery, energy added is 60 × (0.80 − 0.20) = 36 kWh. At a constant 50 kW, time is 36 ÷ 50 = 0.72 hours, or 43.2 minutes.

The table is a comparison of arithmetic, not expected performance at each equipment rating. The highest power rows are especially unlikely to describe an entire session for an unspecified vehicle. The Department for Transport lists vehicle limits, battery management, load management and grid availability as reasons actual power can be below the charger’s rating [S3].

For a vehicle-specific answer, use its usable battery capacity and an evidenced average rate over the chosen charge window. Ask for those assumptions with the installer’s time estimate. Compare the result with the charging-speed explainer.

Why does charging slow down as the battery fills?

Tapering means the charging rate falls during a session. Energy Saving Trust explains that rapid charging can slow above 80% to protect the battery [S1]. The battery management system controls energy acceptance; its limits are one reason a high-rated charger may deliver less power [S3].

Do not treat that percentage as a universal switch point for every car. Ask for the charging curve for the vehicles you expect. A charging curve shows how charging power changes as the battery fills. Your estimate needs the average across the relevant part of that curve, rather than its highest point.

For a second illustration, assume the 36 kWh top-up above averages 60 kW, even though the charger is rated 150 kW. The calculation is 36 ÷ 60 = 0.6 hours, or 36 minutes. Dividing by the label instead would give 14.4 minutes. Those are chosen inputs showing the effect of an assumption, not test results for a vehicle.

That distinction belongs in your customer information. Describe the charger’s rating and explain vehicle dependency. Avoid printing a single full-charge time for every visitor using the bay.

How long does it take to charge fully?

Use the actual starting charge and the required finishing charge. If an assumed usable 60 kWh battery starts at 50% and must reach 100%, it needs 60 × (1.00 − 0.50) = 30 kWh before losses. At an assumed constant 7 kW, the arithmetic is 30 ÷ 7 = about 4.3 hours [S2].

That calculation is a starting point. The final part of rapid charging can be slower, so extending a partial-charge time in a straight line to full can mislead [S1]. For a fleet, ask drivers what charge is required for the next duty and check the vehicle manufacturer’s charging instructions.

Separate charging time from bay occupancy. Allow for drivers arriving, connecting, starting payment and leaving. Ask whether the operational target is energy delivered by departure or rapid turnover of a space. An overnight hotel bay and a short-stop retail bay need different operating policies.

How should you plan charging windows at your site?

Build a sample day with arrivals, departures and energy requirements. Ask your installer to repeat the calculation when the building and all proposed chargers are busy. Load management controls charging within the supply limit, potentially reducing the rate available to each car [S4].

Test the service before making it part of your sales offer. For example, record whether guests can reach their requested charge by checkout without moving cars overnight. For a depot, check the earliest departure as well as the total energy supplied across the night.

Use the dwell-time guide and fleet sector pages to develop the brief. Then compare installation costs and fully funded, part funded and self funded options. Ask every proposal to state the same required charging window.

What should you do next?

Collect your parking windows, vehicle specifications and energy requirements, then get matched with an installer that covers your area for a site assessment.

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