EV Charger Level Comparison Calculator

ANA›Life Services Authority›National Calculator Authority›EV Charger Level Comparison Calculator (Level 1 vs Level 2 vs DC Fast Charge)

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EV Charger Level Comparison Calculator

Compare Level 1, Level 2, and DC Fast Charge times and costs for your electric vehicle based on battery capacity, current charge level, and local electricity rates.

Battery Capacity (kWh)

Total usable battery capacity of your EV (e.g. 75 kWh for Tesla Model 3 Long Range)

Current State of Charge (%)

Your battery's current charge level (0–99%)

Target State of Charge (%)

Desired charge level (1–100%). DC Fast Charge typically limited to 80%.

Electricity Rate ($/kWh)

Your local electricity cost per kWh (US average ≈ $0.13/kWh)

Charger Efficiency (%)

Energy delivery efficiency (Level 1 ≈ 85%, Level 2 ≈ 90%, DCFC ≈ 92%)

Calculate Charging Comparison

function evCalc() { // --- Grab inputs --- const batteryKwh = parseFloat(document.getElementById('ev-battery-capacity').value); const currentSoc = parseFloat(document.getElementById('ev-current-soc').value); const targetSoc = parseFloat(document.getElementById('ev-target-soc').value); const ratePerKwh = parseFloat(document.getElementById('ev-electricity-rate').value); const efficiencyPct= parseFloat(document.getElementById('ev-charger-efficiency').value);

const resultDiv = document.getElementById('ev-result');

// --- Validation --- const errors = []; if (isNaN(batteryKwh) || batteryKwh 200) errors.push("Battery capacity must be between 10 and 200 kWh."); if (isNaN(currentSoc) || currentSoc 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 1.00) errors.push("Electricity rate must be between $0.01 and $1.00 per kWh."); if (isNaN(efficiencyPct) || efficiencyPct 100) errors.push("Charger efficiency must be between 50% and 100%.");

if (errors.length > 0) { resultDiv.style.display = 'block'; resultDiv.innerHTML = 'Please fix the following:' + errors.map(e => '').join('') + ''; return; }

// --- Core Calculations --- // Energy needed to charge from current to target SOC (kWh stored in battery) const socDelta = (targetSoc - currentSoc) / 100; const energyNeededKwh = batteryKwh * socDelta; // kWh delivered to battery

// Charger power ratings (kW) — standard values const L1_POWER_KW = 1.4; // 120V / 12A standard outlet const L2_POWER_KW = 7.2; // 240V / 30A (common home Level 2) const DCFC_POWER_KW = 50.0; // Standard DC Fast Charger (CCS/CHAdeMO)

// Per-charger efficiency overrides (typical values) // This calculator uses the user-supplied efficiency as a baseline and adjust slightly per level const eff = efficiencyPct / 100; const L1_EFF = Math.min(eff * 0.944, 0.95); // L1 slightly less efficient const L2_EFF = Math.min(eff * 1.000, 0.97); // L2 baseline const DCFC_EFF = Math.min(eff * 1.022, 0.98); // DCFC slightly more efficient

// Energy drawn from grid (kWh) = energy needed / efficiency const L1_gridKwh = energyNeededKwh / L1_EFF; const L2_gridKwh = energyNeededKwh / L2_EFF; const DCFC_gridKwh = energyNeededKwh / DCFC_EFF;

// Charging time (hours) = grid energy / charger power const L1_hours = L1_gridKwh / L1_POWER_KW; const L2_hours = L2_gridKwh / L2_POWER_KW; const DCFC_hours = DCFC_gridKwh / DCFC_POWER_KW;

// Cost = grid energy * rate const L1_cost = L1_gridKwh * ratePerKwh; const L2_cost = L2_gridKwh * ratePerKwh; const DCFC_cost = DCFC_gridKwh * ratePerKwh;

// Miles of range added (EPA average: 3–4 miles/kWh; use 3.5) const MILES_PER_KWH = 3.5; const milesAdded = energyNeededKwh * MILES_PER_KWH;

// Cost per mile const L1_cpm = L1_cost / milesAdded; const L2_cpm = L2_cost / milesAdded; const DCFC_cpm = DCFC_cost / milesAdded;

// --- Helpers --- function fmtTime(h) { if (h

Metric 🔌 Level 1120V / 1.4 kW ⚡ Level 2240V / 7.2 kW ⚡⚡ DC Fast Charge480V DC / 50 kW

Charger Power ${fmtPow(L1_POWER_KW)} ${fmtPow(L2_POWER_KW)} ${fmtPow(DCFC_POWER_KW)}

Efficiency ${fmtEff(L1_EFF)} ${fmtEff(L2_EFF)} ${fmtEff(DCFC_EFF)}

Grid Energy Drawn ${fmtKwh(L1_gridKwh)} ${fmtKwh(L2_gridKwh)} ${fmtKwh(DCFC_gridKwh)}

Charging Time ${fmtTime(L1_hours)} ${fmtTime(L2_hours)} ${fmtTime(DCFC_hours)}

Speed vs Level 1 1× (baseline) ${L2_speedup.toFixed(1)}× faster ${DCFC_speedup.toFixed(1)}× faster

Total Cost ${fmtCost(L1_cost)} ${fmtCost(L2_cost)} ${fmtCost(DCFC_cost)}

Cost per Mile ${fmtCpm(L1_cpm)} ${fmtCpm(L2_cpm)} ${fmtCpm(DCFC_cpm)}

Typical Use Case Overnight home charging, low daily mileage Home / workplace, daily top-up Road trips, quick top-up on the go

Typical Equipment Cost $0 (standard outlet) $300–$800 (EVSE unit) $10,000–$50,000+ (commercial)

💡 Key Takeaway: Level 2 is ${L2_speedup.toFixed(1)}× faster than Level 1 for only ${fmtCost(L2_cost - L1_cost)} more in electricity cost (due to efficiency differences). DC Fast Charge is ${DCFC_speedup.toFixed(1)}× faster than Level 1 but may cost more at public stations (commercial rates not reflected here).

`;

resultDiv.style.display = 'block'; resultDiv.innerHTML = html; }

#### Formulas Used

1. Energy needed (kWh delivered to battery):

E_battery = Battery_Capacity × (Target_SOC% − Current_SOC%) / 100

2. Grid energy drawn (kWh from wall):

E_grid = E_battery / Charger_Efficiency

3. Charging time (hours):

Time = E_grid / Charger_Power_kW

4. Total electricity cost:

Cost = E_grid × Electricity_Rate ($/kWh)

5. Estimated miles of range added:

Miles = E_battery × 3.5 miles/kWh (EPA average efficiency)

6. Cost per mile:

Cost_per_mile = Total_Cost / Miles_Added

#### Assumptions & References

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References

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