Charging Speed and Time Calculator
ANA›Life Services Authority›National Calculator Authority›Charging Speed and Time Calculator
.calc-container { max-width: 640px; margin: 2rem 0; padding: 1.5rem; background: #fff; border: 1px solid #ddd; border-radius: 8px; box-shadow: 0 1px 3px rgba(0,0,0,0.06); font-family: system-ui, -apple-system, sans-serif; } .calc-container h3 { font-family: Georgia, serif; font-size: 1.15rem; color: #1a1a1a; margin-bottom: 1rem; padding-bottom: 0.5rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-row { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.75rem; flex-wrap: wrap; } .calc-row label { min-width: 160px; font-size: 0.9rem; color: #333; font-weight: 500; } .calc-row input[type="number"], .calc-row select { flex: 1; min-width: 120px; max-width: 200px; padding: 0.5rem 0.6rem; border: 1px solid #ccc; border-radius: 4px; font-size: 0.9rem; font-family: system-ui, sans-serif; color: #1a1a1a; background: #fafaf8; } .calc-row input:focus, .calc-row select:focus { outline: none; border-color: var(--ac, #3d5a80); box-shadow: 0 0 0 2px rgba(26,74,138,0.12); } .calc-row .unit { font-size: 0.82rem; color: #888; min-width: 30px; } .calc-btn { display: inline-block; margin-top: 0.5rem; padding: 0.55rem 1.5rem; background: var(--ac, #3d5a80); color: #fff; border: none; border-radius: 4px; font-size: 0.9rem; font-weight: 600; cursor: pointer; font-family: system-ui, sans-serif; } .calc-btn:hover { opacity: 0.9; } .calc-result { margin-top: 1.25rem; padding: 1rem 1.25rem; background: #f0f6fc; border-left: 3px solid var(--ac, #3d5a80); border-radius: 0 6px 6px 0; display: none; } .calc-result.visible { display: block; } .calc-result-label { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; color: #666; margin-bottom: 0.25rem; } .calc-result-value { font-size: 1.6rem; font-weight: 700; color: var(--ac, #3d5a80); } .calc-result-detail { font-size: 0.85rem; color: #555; margin-top: 0.5rem; line-height: 1.5; } .calc-note { margin-top: 1rem; font-size: 0.8rem; color: #888; font-style: italic; } .calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; margin-top: 0.75rem; } .calc-grid-item { padding: 0.6rem 0.8rem; background: #f8f9fa; border-radius: 4px; border: 1px solid #eee; } .calc-grid-item .label { font-size: 0.75rem; color: #888; text-transform: uppercase; letter-spacing: 0.04em; } .calc-grid-item .value { font-size: 1.1rem; font-weight: 600; color: #1a1a1a; } @media (max-width: 720px) { .calc-row { flex-direction: column; align-items: flex-start; gap: 0.3rem; } .calc-row label { min-width: auto; } .calc-row input[type="number"], .calc-row select { max-width: 100%; width: 100%; } .calc-grid { grid-template-columns: 1fr; } } .calc-chart { margin: 1rem 0; text-align: center; } .calc-chart svg { max-width: 100%; height: auto; } .calc-chart-legend { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.6rem 1.2rem; margin-top: 0.6rem; font-size: 0.8rem; color: #555; } .calc-chart-legend span { display: inline-flex; align-items: center; gap: 0.3rem; } .calc-chart-legend i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; font-style: normal; } .calc-related { max-width: 640px; margin: 2rem 0 1rem; padding: 1.25rem 1.5rem; background: #f8f9fa; border: 1px solid #e8e8e8; border-radius: 8px; } .calc-related h3 { font-family: Georgia, serif; font-size: 1rem; color: #1a1a1a; margin: 0 0 0.75rem; padding-bottom: 0.4rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-related-list { list-style: none; padding: 0; margin: 0 0 0.75rem; display: grid; grid-template-columns: 1fr 1fr; gap: 0.4rem 1.5rem; } .calc-related-list li a { font-size: 0.88rem; color: var(--ac, #3d5a80); text-decoration: none; } .calc-related-list li a:hover { text-decoration: underline; } .calc-browse-all { margin: 0.5rem 0 0; font-size: 0.9rem; font-weight: 600; } .calc-browse-all a { color: var(--ac, #3d5a80); text-decoration: none; } .calc-browse-all a:hover { text-decoration: underline; } @media (max-width: 720px) { .calc-related-list { grid-template-columns: 1fr; } }
Charging Speed and Time Calculator
Calculate EV or device charging time, charging speed (power), and energy delivered based on battery capacity, charger power, and efficiency.
Calculate:
Charging Time Required Charging Power Energy Delivered
Battery Capacity (kWh):
Current State of Charge (%):
Target State of Charge (%):
Charger Power (kW):
Charging Efficiency (%):
Battery Capacity (kWh):
Current State of Charge (%):
Target State of Charge (%):
Desired Charging Time (hours):
Charging Efficiency (%):
Charger Power (kW):
Charging Duration (hours):
Charging Efficiency (%):
Calculate
function chaToggleMode() { var mode = document.getElementById('cha-mode').value; document.getElementById('cha-group-time').style.display = (mode === 'time') ? '' : 'none'; document.getElementById('cha-group-power').style.display = (mode === 'power') ? '' : 'none'; document.getElementById('cha-group-energy').style.display = (mode === 'energy') ? '' : 'none'; document.getElementById('cha-result').innerHTML = ''; }
function chaFormatTime(hours) { if (hours 0 ? m + ' min' : ''); } }
function chaCalc() { var mode = document.getElementById('cha-mode').value; var resultDiv = document.getElementById('cha-result'); var errors = []; var html = '';
if (mode === 'time') { var cap = parseFloat(document.getElementById('cha-battery-capacity').value); var socS = parseFloat(document.getElementById('cha-soc-start').value); var socE = parseFloat(document.getElementById('cha-soc-end').value); var power = parseFloat(document.getElementById('cha-charger-power').value); var eff = parseFloat(document.getElementById('cha-efficiency-time').value);
if (isNaN(cap) || cap 0 kWh.'); if (isNaN(socS) || socS 99) errors.push('Start SoC must be between 0% and 99%.'); if (isNaN(socE) || socE 100) errors.push('Target SoC must be between 1% and 100%.'); if (!isNaN(socS) && !isNaN(socE) && socE 0 kW.'); if (isNaN(eff) || eff 100) errors.push('Efficiency must be between 1% and 100%.');
if (errors.length > 0) { resultDiv.innerHTML = '' + errors.join('') + ''; return; }
// Energy needed at battery terminals var energyNeeded = cap * (socE - socS) / 100; // kWh // Energy drawn from charger (accounting for losses) var energyFromCharger = energyNeeded / (eff / 100); // Charging time var chargingTime = energyFromCharger / power; // hours // Effective charging speed (energy into battery per hour) var effectiveSpeed = energyNeeded / chargingTime; // kW into battery
html = '### Charging Time Results '; html += ''; html += 'Energy Needed (battery)' + energyNeeded.toFixed(2) + ' kWh'; html += 'Energy Drawn from Charger' + energyFromCharger.toFixed(2) + ' kWh'; html += 'Charging Time' + chaFormatTime(chargingTime) + ' (' + chargingTime.toFixed(2) + ' hrs)'; html += 'Effective Charging Speed' + effectiveSpeed.toFixed(2) + ' kW (into battery)'; html += 'Charging Loss' + (energyFromCharger - energyNeeded).toFixed(2) + ' kWh (' + (100 - eff).toFixed(1) + '%)'; html += '';
} else if (mode === 'power') { var cap = parseFloat(document.getElementById('cha-battery-capacity-p').value); var socS = parseFloat(document.getElementById('cha-soc-start-p').value); var socE = parseFloat(document.getElementById('cha-soc-end-p').value); var tDes = parseFloat(document.getElementById('cha-desired-time').value); var eff = parseFloat(document.getElementById('cha-efficiency-power').value);
if (isNaN(cap) || cap 0 kWh.'); if (isNaN(socS) || socS 99) errors.push('Start SoC must be between 0% and 99%.'); if (isNaN(socE) || socE 100) errors.push('Target SoC must be between 1% and 100%.'); if (!isNaN(socS) && !isNaN(socE) && socE 0 hours.'); if (isNaN(eff) || eff 100) errors.push('Efficiency must be between 1% and 100%.');
if (errors.length > 0) { resultDiv.innerHTML = '' + errors.join('') + ''; return; }
var energyNeeded = cap * (socE - socS) / 100; var energyFromCharger = energyNeeded / (eff / 100); // Required charger power var requiredPower = energyFromCharger / tDes; // kW
html = '### Required Charging Power Results '; html += ''; html += 'Energy Needed (battery)' + energyNeeded.toFixed(2) + ' kWh'; html += 'Energy to Draw from Charger' + energyFromCharger.toFixed(2) + ' kWh'; html += 'Required Charger Power' + requiredPower.toFixed(2) + ' kW'; html += 'Equivalent Voltage @ 240V' + ((requiredPower * 1000) / 240).toFixed(1) + ' A'; html += 'Equivalent Voltage @ 120V' + ((requiredPower * 1000) / 120).toFixed(1) + ' A'; html += '';
} else if (mode === 'energy') { var power = parseFloat(document.getElementById('cha-charger-power-e').value); var duration = parseFloat(document.getElementById('cha-duration').value); var eff = parseFloat(document.getElementById('cha-efficiency-energy').value);
if (isNaN(power) || power 0 kW.'); if (isNaN(duration) || duration 0 hours.'); if (isNaN(eff) || eff 100) errors.push('Efficiency must be between 1% and 100%.');
if (errors.length > 0) { resultDiv.innerHTML = '' + errors.join('') + ''; return; }
var energyFromCharger = power * duration; // kWh drawn var energyDelivered = energyFromCharger * (eff / 100); // kWh into battery var energyLost = energyFromCharger - energyDelivered;
html = '### Energy Delivered Results '; html += ''; html += 'Energy Drawn from Charger' + energyFromCharger.toFixed(2) + ' kWh'; html += 'Energy Delivered to Battery' + energyDelivered.toFixed(2) + ' kWh'; html += 'Energy Lost (heat/conversion)' + energyLost.toFixed(2) + ' kWh'; html += 'Effective Charging Rate' + (energyDelivered / duration).toFixed(2) + ' kW (into battery)'; html += ''; }
resultDiv.innerHTML = html; }
#### Formulas
Charging Time: Energy Needed = Battery Capacity × (SoCend − SoCstart) / 100 Energy from Charger = Energy Needed / Efficiency Charging Time (hrs) = Energy from Charger (kWh) / Charger Power (kW)
Required Charging Power: Required Power (kW) = [Battery Capacity × ΔSoC / 100] / [Efficiency × Desired Time]
Energy Delivered: Energy Drawn = Charger Power (kW) × Duration (hrs) Energy Delivered (kWh) = Energy Drawn × Efficiency
#### Assumptions & References
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