EV Charging Time Calculator

ANA›Life Services Authority›National Calculator Authority›EV Charging Time Calculator

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EV Charging Time Calculator

Calculate how long it will take to charge your electric vehicle based on battery capacity, charger power, and current state of charge.

Battery Capacity (kWh)

Current State of Charge (%)

Target State of Charge (%)

Charger Power (kW)

Charging Efficiency (%)

Calculate Charging Time

function evCalc() { var resultDiv = document.getElementById('ev-result'); resultDiv.style.display = 'none';

var batteryCapacity = parseFloat(document.getElementById('ev-battery-capacity').value); var currentSoc = parseFloat(document.getElementById('ev-current-soc').value); var targetSoc = parseFloat(document.getElementById('ev-target-soc').value); var chargerPower = parseFloat(document.getElementById('ev-charger-power').value); var efficiency = parseFloat(document.getElementById('ev-charger-efficiency').value);

// --- Validation --- if (isNaN(batteryCapacity) || batteryCapacity ⚠ Please enter a valid battery capacity (kWh).'; resultDiv.style.display = 'block'; return; } if (isNaN(currentSoc) || currentSoc 100) { resultDiv.innerHTML = '⚠ Current state of charge must be between 0 and 100%.'; resultDiv.style.display = 'block'; return; } if (isNaN(targetSoc) || targetSoc 100) { resultDiv.innerHTML = '⚠ Target state of charge must be between 0 and 100%.'; resultDiv.style.display = 'block'; return; } if (targetSoc ⚠ Target state of charge must be greater than current state of charge.'; resultDiv.style.display = 'block'; return; } if (isNaN(chargerPower) || chargerPower ⚠ Please enter a valid charger power (kW).'; resultDiv.style.display = 'block'; return; } if (isNaN(efficiency) || efficiency 100) { resultDiv.innerHTML = '⚠ Charging efficiency must be between 50 and 100%.'; resultDiv.style.display = 'block'; return; }

// --- Core Formula --- // Energy needed from battery (kWh) var energyNeeded = batteryCapacity * (targetSoc - currentSoc) / 100;

// Effective power delivered to battery accounting for efficiency losses // The charger draws chargerPower from the grid; efficiency fraction reaches the battery var effectivePower = chargerPower * (efficiency / 100);

// Charging time in hours var chargingTimeHours = energyNeeded / effectivePower;

// Energy drawn from grid (kWh) — accounts for losses var gridEnergyDrawn = energyNeeded / (efficiency / 100);

// Break time into hours and minutes var hours = Math.floor(chargingTimeHours); var minutes = Math.round((chargingTimeHours - hours) * 60); if (minutes === 60) { hours += 1; minutes = 0; }

// Format time string var timeStr = ''; if (hours > 0 && minutes > 0) { timeStr = hours + ' hr ' + minutes + ' min'; } else if (hours > 0) { timeStr = hours + ' hr'; } else { timeStr = minutes + ' min'; }

// Charger type label var chargerType = ''; if (chargerPower ' + '' + 'Charger Type' + chargerType + '' + 'Energy Needed (battery)' + energyNeeded.toFixed(2) + ' kWh' + 'Energy Drawn from Grid' + gridEnergyDrawn.toFixed(2) + ' kWh' + 'Effective Charge Rate' + effectivePower.toFixed(2) + ' kW' + 'SOC Change' + currentSoc + '% → ' + targetSoc + '%' + ''; resultDiv.style.display = 'block'; }

#### Formula

Energy Needed (kWh) = Battery Capacity × (Target SOC − Current SOC) / 100 Effective Charge Power (kW) = Charger Power × (Efficiency / 100) Charging Time (hours) = Energy Needed ÷ Effective Charge Power Grid Energy Drawn (kWh) = Energy Needed ÷ (Efficiency / 100)

#### Assumptions & References

More Calculators

References

Related Authorities

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