Charging Time Calculator by Charger Level and Battery Size
ANA›Life Services Authority›National Calculator Authority›Charging Time Calculator by Charger Level and Battery Size
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Charging Time Calculator by Charger Level and Battery Size
Estimate how long it will take to charge your electric vehicle based on your charger type, battery capacity, and current state of charge.
Battery Capacity (kWh)
Current State of Charge (%)
Target State of Charge (%)
Charger Level
Level 1 — Standard Outlet (1.4 kW / 120V 12A) Level 1 — Standard Outlet (1.92 kW / 120V 16A) Level 2 — 3.3 kW (240V 15A) Level 2 — 6.6 kW (240V 30A) Level 2 — 7.2 kW (240V 32A) Level 2 — 9.6 kW (240V 40A) Level 2 — 11.5 kW (240V 48A) Level 2 — 19.2 kW (240V 80A) DC Fast Charge — 50 kW (CHAdeMO / CCS) DC Fast Charge — 100 kW DC Fast Charge — 150 kW DC Fast Charge — 250 kW (Tesla V3 Supercharger) DC Fast Charge — 350 kW (Ultra-Fast) Custom Power Output (kW)
Custom Charger Power (kW)
Charging Efficiency (%)
Typical AC charging: 85–92%. DC fast charging: 90–95%.
Calculate Charging Time
function chaSyncCustomPower() { var sel = document.getElementById('cha-charger-level'); var grp = document.getElementById('cha-custom-power-group'); grp.style.display = (sel.value === 'custom') ? 'block' : 'none'; }
function chaCalc() { var resultDiv = document.getElementById('cha-result'); resultDiv.style.display = 'none';
// --- Read inputs --- var batterySize = parseFloat(document.getElementById('cha-battery-size').value); var currentSOC = parseFloat(document.getElementById('cha-current-soc').value); var targetSOC = parseFloat(document.getElementById('cha-target-soc').value); var chargerSel = document.getElementById('cha-charger-level').value; var efficiency = parseFloat(document.getElementById('cha-efficiency').value);
var chargerPower; if (chargerSel === 'custom') { chargerPower = parseFloat(document.getElementById('cha-custom-power').value); } else { chargerPower = parseFloat(chargerSel); }
// --- Validation --- var errors = []; if (isNaN(batterySize) || batterySize 99) errors.push('Current state of charge must be between 0% and 99%.'); if (isNaN(targetSOC) || targetSOC 100) errors.push('Target state of charge must be between 1% and 100%.'); if (!isNaN(currentSOC) && !isNaN(targetSOC) && targetSOC 100) errors.push('Charging efficiency must be between 50% and 100%.');
if (errors.length > 0) { resultDiv.style.display = 'block'; resultDiv.innerHTML = 'Please fix the following:' + errors.map(function(e){ return ''; }).join('') + ''; return; }
// --- Core Formula --- // Energy needed (kWh) = Battery Capacity × (Target SOC − Current SOC) / 100 var energyNeeded = batterySize * (targetSOC - currentSOC) / 100;
// Effective power delivered to battery (kW) = Charger Power × (Efficiency / 100) var effectivePower = chargerPower * (efficiency / 100);
// Charging Time (hours) = Energy Needed / Effective Power var chargingTimeHours = energyNeeded / effectivePower;
// Convert to hours and minutes var hours = Math.floor(chargingTimeHours); var minutes = Math.round((chargingTimeHours - hours) * 60); if (minutes === 60) { hours += 1; minutes = 0; }
// Cost estimate (optional informational — using US avg $0.16/kWh) var costPerKwh = 0.16; var estimatedCost = energyNeeded * costPerKwh;
// Range added estimate (using avg 3.5 miles/kWh) var milesPerKwh = 3.5; var rangeAdded = energyNeeded * milesPerKwh;
// Format time string var timeStr = ''; if (hours > 0 && minutes > 0) { timeStr = hours + ' hr ' + minutes + ' min'; } else if (hours > 0) { timeStr = hours + ' hr'; } else { timeStr = minutes + ' min'; }
// --- Output --- resultDiv.style.display = 'block'; resultDiv.innerHTML = '### Charging Time Estimate ' + '' + 'Estimated Charging Time' + timeStr + ' (' + chargingTimeHours.toFixed(2) + ' hrs)' + 'Energy to Add' + energyNeeded.toFixed(2) + ' kWh' + 'Effective Charging Power' + effectivePower.toFixed(2) + ' kW' + 'SOC Change' + currentSOC + '% → ' + targetSOC + '% (' + (targetSOC - currentSOC) + '%)' + 'Estimated Range Added~' + rangeAdded.toFixed(0) + ' miles (at 3.5 mi/kWh avg)' + 'Estimated Electricity Cost~$' + estimatedCost.toFixed(2) + ' (at $0.16/kWh US avg)' + ''; }
#### Formula
Step 1 — Energy Needed (kWh):
Energy = Battery Capacity (kWh) × (Target SOC% − Current SOC%) ÷ 100
Step 2 — Effective Charging Power (kW):
Effective Power = Charger Power (kW) × (Efficiency% ÷ 100)
Step 3 — Charging Time (hours):
Charging Time = Energy Needed (kWh) ÷ Effective Power (kW)
Example: 75 kWh battery, 20% → 80% SOC, 6.6 kW charger, 90% efficiency: Energy = 75 × (80−20)/100 = 45 kWh | Effective Power = 6.6 × 0.90 = 5.94 kW | Time = 45 ÷ 5.94 ≈ 7.58 hrs (7 hr 35 min)
#### Assumptions & References
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