How much charge can you add in 30 minutes?
Half an hour does not correspond to a fixed percentage of battery. The result depends on effective power, charging efficiency, usable capacity and how much space remains in the battery.
For a constant-power AC illustration, energy stored = effective power × hours × efficiency. Thirty minutes is 0.5 hours. At 11 kW and 90% efficiency, the stored energy is 11 × 0.5 × 0.90 = 4.95 kWh.
In this guideChoose a section
01
Turn the stop duration into energy
Use the power the vehicle can actually accept. A 22 kW point feeding a 7.4 kW onboard charger remains limited to 7.4 kW, before other constraints. The battery must also have room for the energy calculated.
02
Convert energy to percentage points
Percentage points ≈ stored kWh ÷ usable battery kWh × 100. In a 60 kWh usable battery, 4.95 kWh is 8.25 percentage points. Starting at 20%, the theoretical result is 28.25% if the assumed conditions stay constant.
The same energy corresponds to about 12.38 points in a 40 kWh battery and 6.19 points in an 80 kWh battery. The difference comes from capacity; it does not by itself show that one vehicle is more efficient.
03
A DC session needs its charging curve
100 kW × 0.5 hours equals 50 kWh only if 100 kW is maintained throughout. A real DC session varies with state of charge, temperature, vehicle and station limits.
Do not multiply an advertised peak by the stop duration as though it were an average.
In the calculator choose your vehicle, starting charge, AC or DC and available power, then use the parking-time mode. If you convert recovered energy to distance, use a consumption figure suited to the route and conditions. The result cannot exceed the available battery space.
More examples and detail
Examples from the expanded catalogue
The Togg T10X V2 German 2026 configurations distinguish 11 and 22 kW onboard AC chargers. The Fiat E-Doblò Passenger Italian 2023 configurations distinguish 7.4 and 11 kW AC. A 22 kW point does not remove those version limits.
In a 30-minute AC illustration with 90% efficiency, 7.4, 11 and 22 kW store 3.33, 4.95 and 9.9 kWh respectively, if all power and battery-space conditions are met.
Specifications refer to the version, year and market shown. Model records have English notes; original source documents may use another language. They do not certify current availability in your country.
05
Sources and method
English editorial version updated 16 October 2026. Arithmetic examples are Ricaora calculations. Efficiencies, consumption assumptions and example tariffs are not measured vehicle results or current commercial offers.
Installation requirements and electricity contracts vary by country; use qualified local advice for the electrical system.