Charging time, cost, current, demand, and feeder planning
EV Charger Load Calculator
Estimate EV charger current and total distribution load from charger power, phase, quantity, and simultaneity.
Open calculatorEV Charging Tools
Calculators for EV charging current, charging duration and cost, multiple-charger demand, and feeder planning.
2 calculatorsCharging time, cost, current, demand, and feeder planning
EV Charging Time and Cost Calculator
Estimate EV charging time, delivered energy, wall energy, and cost from battery state of charge and charger power.
Open calculatorConnect the vehicle charging session to the installation
EV charging design links vehicle energy demand with charger power, phase arrangement, charging duration, efficiency, tariff, feeder capacity, simultaneity, and load management.
Overcurrent, residual-current, surge, cable, voltage-drop, and fault-current checks remain separate decisions and must follow the charger instructions and local EV installation rules.
Separate the charging session from installation capacity
Battery size and target state of charge determine session energy, while charger power and efficiency determine duration. The building sees charger input power, not only energy delivered to the battery.
Multiple chargers rarely operate from a simple sum without considering simultaneity or active load management. The accepted diversity method must match the project, utility, and local requirements.
Applications
Where these calculators fit
Driver planning
Estimate charging time, wall energy, and session cost from battery and charger data.
Site load planning
Calculate charger current, quantity, simultaneity, and distribution demand.
Protection workflow
Continue to cable, breaker, RCBO or RCD, SPD, voltage-drop, and fault-current checks.
FAQ
Why is actual charging time longer than battery kWh divided by charger kW?
Charging losses, vehicle power limits, temperature conditioning, and high-SOC tapering reduce the average power delivered to the battery.
Can all EV chargers be added at 100 percent demand?
That is conservative but may not reflect an approved load-management design. Use the demand method accepted by the project authority and utility.
Does every EV charger require a Type B RCD?
Not always. The required type depends on charger-integrated DC detection, waveform behavior, manufacturer instructions, and local rules.
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