.ev-calculator-container {
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
max-width: 800px;
margin: 0 auto;
color: #333;
line-height: 1.6;
}
.ev-calc-box {
background-color: #f9f9f9;
border: 1px solid #e0e0e0;
border-radius: 8px;
padding: 25px;
margin-bottom: 30px;
box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}
.ev-calc-title {
text-align: center;
color: #2c3e50;
margin-bottom: 25px;
font-size: 24px;
font-weight: 700;
}
.ev-form-grid {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 20px;
}
@media (max-width: 600px) {
.ev-form-grid {
grid-template-columns: 1fr;
}
}
.ev-input-group {
margin-bottom: 15px;
}
.ev-input-group label {
display: block;
margin-bottom: 5px;
font-weight: 600;
color: #555;
font-size: 14px;
}
.ev-input-group input, .ev-input-group select {
width: 100%;
padding: 10px;
border: 1px solid #ccc;
border-radius: 4px;
font-size: 16px;
box-sizing: border-box;
}
.ev-input-group input:focus {
border-color: #3498db;
outline: none;
box-shadow: 0 0 5px rgba(52, 152, 219, 0.3);
}
.ev-calc-btn {
display: block;
width: 100%;
background-color: #27ae60;
color: white;
border: none;
padding: 15px;
font-size: 18px;
font-weight: bold;
border-radius: 4px;
cursor: pointer;
margin-top: 20px;
transition: background-color 0.3s;
}
.ev-calc-btn:hover {
background-color: #219150;
}
.ev-results {
background-color: #fff;
border: 1px solid #ddd;
border-radius: 6px;
padding: 20px;
margin-top: 25px;
display: none;
}
.ev-result-row {
display: flex;
justify-content: space-between;
align-items: center;
padding: 10px 0;
border-bottom: 1px solid #eee;
}
.ev-result-row:last-child {
border-bottom: none;
}
.ev-result-label {
font-weight: 600;
color: #7f8c8d;
}
.ev-result-value {
font-weight: 700;
color: #2c3e50;
font-size: 18px;
}
.ev-highlight {
color: #27ae60;
font-size: 22px;
}
.ev-article h2 {
color: #2c3e50;
margin-top: 30px;
font-size: 22px;
}
.ev-article h3 {
color: #34495e;
margin-top: 20px;
font-size: 18px;
}
.ev-article p {
margin-bottom: 15px;
}
.ev-article ul {
margin-bottom: 15px;
padding-left: 20px;
}
.ev-article li {
margin-bottom: 8px;
}
.info-tooltip {
font-size: 12px;
color: #999;
margin-top: 4px;
}
function calculateEVCharging() {
// Get input values
var batCap = parseFloat(document.getElementById('batteryCapacity').value);
var efficiency = parseFloat(document.getElementById('efficiency').value);
var startCharge = parseFloat(document.getElementById('currentCharge').value);
var targetCharge = parseFloat(document.getElementById('targetCharge').value);
var voltage = parseFloat(document.getElementById('voltage').value);
var amperage = parseFloat(document.getElementById('amperage').value);
// Validation
if (isNaN(batCap) || batCap <= 0) {
alert("Please enter a valid Battery Capacity.");
return;
}
if (isNaN(startCharge) || startCharge = 100) {
alert("Please enter a valid Current Charge percentage (0-99).");
return;
}
if (isNaN(targetCharge) || targetCharge 100) {
alert("Target Charge must be higher than Current Charge and no more than 100.");
return;
}
if (isNaN(voltage) || voltage <= 0) {
alert("Please check the Voltage.");
return;
}
if (isNaN(amperage) || amperage <= 0) {
alert("Please check the Amperage.");
return;
}
if (isNaN(efficiency) || efficiency < 1) {
efficiency = 90; // Fallback default
}
// Calculation Logic
// 1. Calculate Theoretical Power (kW) = V * A / 1000
var rawPower = (voltage * amperage) / 1000;
// 2. Calculate Real Power based on efficiency (kW)
var realPower = rawPower * (efficiency / 100);
// 3. Calculate Energy Needed (kWh)
var chargeDifference = targetCharge – startCharge;
var neededKwh = batCap * (chargeDifference / 100);
// 4. Calculate Time (Hours)
// Prevent division by zero
if (realPower === 0) {
alert("Resulting power is 0. Check Volts and Amps.");
return;
}
var totalHours = neededKwh / realPower;
// Convert to Hours and Minutes
var hours = Math.floor(totalHours);
var minutes = Math.round((totalHours – hours) * 60);
// 5. Estimate Range per Hour (Assumption: 3.5 miles per kWh average efficiency)
var rangeAddedPerHour = realPower * 3.5;
// Update DOM
document.getElementById('powerDraw').innerText = rawPower.toFixed(2) + " kW";
document.getElementById('chargingRate').innerText = realPower.toFixed(2) + " kW";
document.getElementById('energyNeeded').innerText = neededKwh.toFixed(1) + " kWh";
document.getElementById('timeToCharge').innerText = hours + "h " + minutes + "m";
document.getElementById('rangePerHour').innerText = "~" + Math.round(rangeAddedPerHour) + " miles/hr";
// Show results
document.getElementById('evResultBox').style.display = "block";
}
EV Charging Rate & Time Calculator
Total usable battery size in Kilowatt-hours.
Typically 85-95% for Level 2 chargers.
120V (Level 1 – Household Outlet)
208V (Commercial Level 2)
240V (Home Level 2 – Dryer/Range)
400V (European 3-Phase)
Common: 12A, 16A, 32A, 40A, 48A.
Theoretical Power Draw:
0 kW
Actual Charging Rate (Net):
0 kW
Energy Needed:
0 kWh
Estimated Charging Time:
0h 0m
Est. Range Added per Hour:
0 miles/hr
Understanding Your EV Charging Rate
Electric Vehicle (EV) charging speed depends on the complex relationship between voltage (Volts), current (Amps), and your vehicle's onboard charger capacity. This EV Charging Rate Calculator helps you estimate exactly how long it will take to charge your battery from a specific percentage to your target level.
How Charging Speed is Calculated
The rate at which energy flows into your EV battery is measured in Kilowatts (kW). The formula for calculating this rate is:
Power (kW) = (Volts × Amps) / 1000
However, charging is never 100% efficient. Some energy is lost as heat during the conversion from AC (grid power) to DC (battery power). This calculator accounts for charger efficiency (typically between 85% and 95%) to give you a realistic "Net Charging Rate."
Key Factors Affecting Charge Time
- Battery Capacity (kWh): The size of your "fuel tank." Larger batteries take longer to fill but offer more range.
- Voltage (V): Level 1 charging uses standard 120V household outlets, while Level 2 uses 240V (similar to a dryer outlet), effectively doubling or quadrupling the pressure of electricity flow.
- Amperage (A): The volume of electricity flowing. A 32-Amp charger will charge significantly faster than a 12-Amp charger, provided the voltage is the same.
- Onboard Charger Limit: Even if you plug into a high-powered station, your car's internal onboard charger may limit the intake rate (commonly 7.2 kW or 11 kW for many modern EVs).
Common Charging Scenarios
- Level 1 (120V, 12A): Adds roughly 3-5 miles of range per hour. Best for overnight charging of plug-in hybrids or low-mileage commuters.
- Level 2 (240V, 32A-48A): Adds roughly 25-45 miles of range per hour. This is the standard for home wall connectors and public AC charging stations.
- DC Fast Charging: Bypasses the onboard AC charger for rapid refueling. Note: This calculator focuses on AC charging (Level 1 and Level 2) logic.