Level 1 vs Level 2 Charger Charging Time Calculator

ANA›Life Services Authority›National Calculator Authority›Level 1 vs Level 2 Charger Charging Time Calculator

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Level 1 vs Level 2 Charger Charging Time Calculator

Compare how long it takes to charge your electric vehicle using a Level 1 (120V household outlet) versus a Level 2 (240V dedicated charger) based on your battery size and current state of charge.

Battery Capacity (kWh)

Total usable battery capacity of your EV (e.g. 40–100 kWh for most EVs)

Current State of Charge (%)

Current battery charge level (0–99%)

Target State of Charge (%)

Desired charge level (1–100%)

Level 1 Charger Output (kW)

Typical Level 1 output: 1.2–1.9 kW (120V / 12–16A)

Level 2 Charger Output (kW)

Typical Level 2 output: 3.3–19.2 kW (240V / 16–80A)

Charging Efficiency (%)

Energy lost during charging (typically 80–90%)

Calculate Charging Time

function levCalc() { const resultDiv = document.getElementById('lev-result');

const batteryCapacity = parseFloat(document.getElementById('lev-battery-capacity').value); const currentSOC = parseFloat(document.getElementById('lev-current-soc').value); const targetSOC = parseFloat(document.getElementById('lev-target-soc').value); const l1Power = parseFloat(document.getElementById('lev-l1-power').value); const l2Power = parseFloat(document.getElementById('lev-l2-power').value); const efficiency = parseFloat(document.getElementById('lev-efficiency').value);

// --- Validation --- if (isNaN(batteryCapacity) || isNaN(currentSOC) || isNaN(targetSOC) || isNaN(l1Power) || isNaN(l2Power) || isNaN(efficiency)) { resultDiv.style.display = 'block'; resultDiv.innerHTML = '⚠️ Please fill in all fields.'; return; } if (batteryCapacity 200) { resultDiv.style.display = 'block'; resultDiv.innerHTML = '⚠️ Battery capacity must be between 1 and 200 kWh.'; return; } if (currentSOC 99) { resultDiv.style.display = 'block'; resultDiv.innerHTML = '⚠️ Current state of charge must be between 0% and 99%.'; return; } if (targetSOC 100) { resultDiv.style.display = 'block'; resultDiv.innerHTML = '⚠️ Target state of charge must be between 1% and 100%.'; return; } if (targetSOC ⚠️ Target charge must be greater than current charge.'; return; } if (l1Power 3) { resultDiv.style.display = 'block'; resultDiv.innerHTML = '⚠️ Level 1 charger output must be between 0.5 and 3 kW.'; return; } if (l2Power 22) { resultDiv.style.display = 'block'; resultDiv.innerHTML = '⚠️ Level 2 charger output must be between 1 and 22 kW.'; return; } if (efficiency 100) { resultDiv.style.display = 'block'; resultDiv.innerHTML = '⚠️ Charging efficiency must be between 50% and 100%.'; return; }

// --- Core Formula --- // Energy needed (kWh) = Battery Capacity × (Target SOC − Current SOC) / 100 // Effective charger output (kW) = Charger Power × (Efficiency / 100) // Charging Time (hours) = Energy Needed / Effective Charger Output

const energyNeeded = batteryCapacity * (targetSOC - currentSOC) / 100; const efficiencyDec = efficiency / 100;

const l1Effective = l1Power * efficiencyDec; const l2Effective = l2Power * efficiencyDec;

const l1TimeHours = energyNeeded / l1Effective; const l2TimeHours = energyNeeded / l2Effective;

const timeSavedHours = l1TimeHours - l2TimeHours; const speedupFactor = l1TimeHours / l2TimeHours;

function formatTime(hours) { if (hours

Metric 🔌 Level 1 (120V) ⚡ Level 2 (240V)

Charger Output ${l1Power.toFixed(1)} kW ${l2Power.toFixed(1)} kW

Effective Output (after losses) ${l1Effective.toFixed(2)} kW ${l2Effective.toFixed(2)} kW

Charging Time ${l1TimeStr} ${l2TimeStr}

Time (decimal hours) ${l1TimeHours.toFixed(2)} hrs ${l2TimeHours.toFixed(2)} hrs

🏆 Level 2 is ${speedupFactor.toFixed(1)}× faster — saves you ${savedStr} per charge session.

📊 Session Summary Energy to add: ${energyNeeded.toFixed(2)} kWh (${currentSOC}% → ${targetSOC}% of ${batteryCapacity} kWh battery) Estimated electricity cost: $${totalCost.toFixed(2)} (at $${costPerKwh}/kWh, accounting for ${efficiency}% efficiency)

`; }

#### Formula

Step 1 — Energy Needed (kWh):

Energy = Battery Capacity (kWh) × (Target SOC% − Current SOC%) ÷ 100

Step 2 — Effective Charger Output (kW):

Effective Output = Charger Power (kW) × (Efficiency% ÷ 100)

Step 3 — Charging Time (hours):

Charging Time = Energy Needed (kWh) ÷ Effective Output (kW)

The efficiency factor accounts for energy lost as heat during the AC-to-DC conversion process inside the vehicle's onboard charger. A typical value is 85–90%.

#### Assumptions & References

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References

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