EV Charging Cost Calculator (Tennessee Electricity Rates)

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EV Charging Cost Calculator (Tennessee Electricity Rates)

Estimate how much it costs to charge your electric vehicle at home using Tennessee's average residential electricity rates.

Battery Capacity (kWh)

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

Current State of Charge (%)

Your battery's current charge level before plugging in

Target State of Charge (%)

Desired charge level after charging session

Charger Efficiency (%)

Level 1 chargers ≈ 85%, Level 2 chargers ≈ 90–95%

Electricity Rate (¢/kWh)

Tennessee average residential rate ≈ 11.5 ¢/kWh (TVA service area, 2024)

Charging Sessions per Month

How many times per month you perform this type of charge

Calculate Charging Cost

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

var batteryCapacity = parseFloat(document.getElementById('ev-battery-capacity').value); var currentCharge = parseFloat(document.getElementById('ev-current-charge').value); var targetCharge = parseFloat(document.getElementById('ev-target-charge').value); var chargerEfficiency = parseFloat(document.getElementById('ev-charger-efficiency').value); var rateCents = parseFloat(document.getElementById('ev-rate').value); var sessionsPerMonth = parseFloat(document.getElementById('ev-sessions-per-month').value);

// --- Validation --- var errors = []; if (isNaN(batteryCapacity) || batteryCapacity 200) errors.push('Battery capacity must be between 1 and 200 kWh.'); if (isNaN(currentCharge) || currentCharge 100) errors.push('Current state of charge must be between 0% and 100%.'); if (isNaN(targetCharge) || targetCharge 100) errors.push('Target state of charge must be between 0% and 100%.'); if (!isNaN(currentCharge) && !isNaN(targetCharge) && targetCharge 100) errors.push('Charger efficiency must be between 50% and 100%.'); if (isNaN(rateCents) || rateCents 100) errors.push('Electricity rate must be between 0 and 100 ¢/kWh.'); if (isNaN(sessionsPerMonth) || sessionsPerMonth 365) errors.push('Sessions per month must be between 1 and 365.');

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

// --- Core Formulas --- // 1. Energy needed from battery (kWh) var energyNeeded = batteryCapacity * (targetCharge - currentCharge) / 100;

// 2. Energy drawn from grid (kWh) — accounts for charger losses var gridEnergyPerSession = energyNeeded / (chargerEfficiency / 100);

// 3. Cost per session ($) var ratePerKwh = rateCents / 100; var costPerSession = gridEnergyPerSession * ratePerKwh;

// 4. Monthly cost ($) var monthlyCost = costPerSession * sessionsPerMonth;

// 5. Annual cost ($) var annualCost = monthlyCost * 12;

// 6. Cost per mile (assuming US average EV efficiency ≈ 3.5 miles/kWh) var evEfficiency = 3.5; // miles per kWh (battery) var milesPerSession = energyNeeded * evEfficiency; var costPerMile = (milesPerSession > 0) ? (costPerSession / milesPerSession) : 0;

// 7. Equivalent gas cost comparison (avg US gas price ~$3.30/gal, avg MPG ~28) var gasPrice = 3.30; var mpg = 28; var gasCostPerMile = gasPrice / mpg; var gasCostPerSession = gasCostPerMile * milesPerSession; var savingsPerSession = gasCostPerSession - costPerSession; var annualSavings = savingsPerSession * sessionsPerMonth * 12;

resultDiv.style.display = 'block'; resultDiv.innerHTML = '### ⚡ Charging Cost Results ' + '' + 'Energy needed from battery' + energyNeeded.toFixed(2) + ' kWh' + 'Energy drawn from grid (with charger losses)' + gridEnergyPerSession.toFixed(2) + ' kWh' + 'Cost per charging session$' + costPerSession.toFixed(2) + '' + 'Estimated miles added per session' + milesPerSession.toFixed(1) + ' miles' + 'Cost per mile (EV)$' + costPerMile.toFixed(4) + '' + 'Monthly charging cost (' + sessionsPerMonth + ' sessions)$' + monthlyCost.toFixed(2) + '' + 'Annual charging cost$' + annualCost.toFixed(2) + '' + 'Equivalent gas cost per session (@$' + gasPrice.toFixed(2) + '/gal, ' + mpg + ' MPG)$' + gasCostPerSession.toFixed(2) + '' + '🆕 Estimated annual savings vs. gasoline$' + annualSavings.toFixed(2) + '' + '' + 'Based on Tennessee average rate of ' + rateCents.toFixed(2) + ' ¢/kWh and ' + chargerEfficiency + '% charger efficiency.

'; }

#### Formulas Used

1. Energy needed from battery (kWh): Ebattery = Battery Capacity × (Target% − Current%) ÷ 100

2. Grid energy drawn (kWh) — accounts for charger losses: Egrid = Ebattery ÷ (Charger Efficiency ÷ 100)

3. Cost per session ($): Costsession = Egrid × (Rate ÷ 100)

4. Monthly cost ($): Costmonthly = Costsession × Sessions per Month

5. Annual cost ($): Costannual = Costmonthly × 12

6. Cost per mile ($): Cost/mile = Costsession ÷ (Ebattery × EV Efficiency) where EV Efficiency = 3.5 miles/kWh (US average)

7. Annual savings vs. gasoline ($): Savings = (Gas Cost/Mile − EV Cost/Mile) × Miles/Session × Sessions/Month × 12

#### Assumptions & References

More Calculators

References

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