Home Charging Cost Calculator (Indiana Electricity Rates)

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Home Charging Cost Calculator (Indiana Electricity Rates)

Estimate your monthly and annual home EV charging costs based on Indiana's average residential electricity rates.

Battery Capacity (kWh)

Check your EV's spec sheet for usable battery capacity (e.g., Tesla Model 3 LR ≈ 75 kWh)

Charges per Month

Typical drivers charge 6–12 times per month depending on range and driving habits

Average State of Charge Before Charging (%)

Most drivers plug in around 20–30% remaining charge

Target Charge Level (%)

Charging to 80–90% is recommended for daily use to preserve battery health

Charger Efficiency (%)

Level 2 chargers are typically 85–92% efficient; Level 1 chargers ~80–85%

Electricity Rate (¢/kWh)

Indiana average residential rate ≈ 13.72 ¢/kWh (EIA, 2024). Check your utility bill for your exact rate.

Calculate Charging Cost

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

var batterySize = parseFloat(document.getElementById('hom-battery-size').value); var chargeFrequency = parseFloat(document.getElementById('hom-charge-frequency').value); var startCharge = parseFloat(document.getElementById('hom-charge-level').value); var targetCharge = parseFloat(document.getElementById('hom-target-charge').value); var chargerEff = parseFloat(document.getElementById('hom-charger-efficiency').value); var rate = parseFloat(document.getElementById('hom-rate').value);

// --- Validation --- var errors = []; if (isNaN(batterySize) || batterySize 200) errors.push("Battery capacity must be between 1 and 200 kWh."); if (isNaN(chargeFrequency) || chargeFrequency 31) errors.push("Charges per month must be between 1 and 31."); if (isNaN(startCharge) || startCharge 99) errors.push("Starting charge level must be between 0% and 99%."); if (isNaN(targetCharge) || targetCharge 100) errors.push("Target charge level must be between 1% and 100%."); if (!isNaN(startCharge) && !isNaN(targetCharge) && targetCharge 100) errors.push("Charger efficiency must be between 50% and 100%."); if (isNaN(rate) || rate 100) errors.push("Electricity rate must be between 0 and 100 ¢/kWh.");

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

// --- Core Calculations --- // Energy needed per charge session (kWh drawn from battery) var depthOfCharge = (targetCharge - startCharge) / 100; // fraction var energyPerSession_kWh = batterySize * depthOfCharge; // kWh (battery energy)

// Wall energy consumed per session accounting for charger losses var efficiencyFraction = chargerEff / 100; var wallEnergyPerSession = energyPerSession_kWh / efficiencyFraction; // kWh from wall

// Monthly wall energy var monthlyWallEnergy = wallEnergyPerSession * chargeFrequency; // kWh/month

// Annual wall energy var annualWallEnergy = monthlyWallEnergy * 12; // kWh/year

// Cost calculations (rate in cents → divide by 100 for dollars) var rateDollars = rate / 100; // $/kWh var costPerSession = wallEnergyPerSession * rateDollars; // $ var monthlyCost = monthlyWallEnergy * rateDollars; // $ var annualCost = annualWallEnergy * rateDollars; // $

// Cost per mile estimate (EPA average EV efficiency ≈ 3.5 miles/kWh) var milesPerKwh = 3.5; var milesPerSession = energyPerSession_kWh * milesPerKwh; var costPerMile = costPerSession / milesPerSession;

// --- Output --- resultDiv.style.display = 'block'; resultDiv.innerHTML = '### ⚡ Charging Cost Estimate ' + '' + 'Energy added per session (battery)' + energyPerSession_kWh.toFixed(2) + ' kWh' + 'Wall energy consumed per session' + wallEnergyPerSession.toFixed(2) + ' kWh' + 'Cost per charging session$' + costPerSession.toFixed(2) + '' + 'Monthly wall energy consumed' + monthlyWallEnergy.toFixed(2) + ' kWh' + 'Monthly charging cost$' + monthlyCost.toFixed(2) + '' + 'Annual charging cost$' + annualCost.toFixed(2) + '' + 'Estimated cost per mile$' + costPerMile.toFixed(4) + ' / mile' + '' + 'Based on Indiana average residential rate of ' + rate.toFixed(2) + ' ¢/kWh and ' + chargeFrequency + ' charge session(s)/month from ' + startCharge + '% → ' + targetCharge + '% on a ' + batterySize + ' kWh battery.

'; }

#### Formulas Used

1. Energy added per session (battery): Ebattery = Battery Capacity (kWh) × (Target% − Start%) / 100

2. Wall energy consumed per session: Ewall = Ebattery / (Charger Efficiency / 100) Accounts for heat and conversion losses in the charger.

3. Monthly wall energy: Emonthly = Ewall × Charges per Month

4. Monthly cost: Costmonthly = Emonthly × (Rate ¢/kWh / 100)

5. Annual cost: Costannual = Costmonthly × 12

6. Cost per mile: Cost/mile = Costsession / (Ebattery × 3.5 miles/kWh)

#### Assumptions & References

More Calculators

References

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