Estimated Charging Time
What is the Charging Time Calculator?
The Charging Time Calculator is an online tool designed for EV owners and EV charger installation engineers. Based on the physics formula T = (Capacity × Charge Ratio) / (Power × Efficiency), it provides real-time estimation of the precise time required to charge from the current state to the target state of charge.
Whether it’s a home 7kW slow charger, a public 11kW/22kW AC charger, a 120kW GB-standard DC fast charger, or a 480kW liquid-cooled ultra-fast charger, this tool delivers accurate time estimates to help you plan your travel and charging schedule effectively.
Key Features
- Multi-scenario support: 13 EV charger presets with one-click loading — AC (7/11/22/43kW) + DC (30/60/80/100/120/160/240/400/480kW), covering everything from home slow charging to liquid-cooled ultra-fast charging
- Four-tier time output: Calculates 20→80% / 0→80% / 0→100% / 50→80% charging durations simultaneously, matching real-world usage habits
- Adjustable efficiency: Defaults to 90% overall efficiency, manually adjustable to match actual conditions (cold / hot / aging battery)
- Smart prompts: Automatically provides EV charger scenario recommendations (home / commute / commercial / ultra-fast), trickle and current-limiting warnings — eliminating range anxiety
- Clear button: Not satisfied with the inputs? Click ✕ Clear to restore all defaults with one click
- Pure frontend: All calculations run locally in the browser — vehicle data is never uploaded
Frequently Asked Questions (FAQ)
What is the charging time calculation formula?
Core formula: Charging time (hours) = Battery capacity (kWh) × Charge ratio ÷ Charging power (kW) ÷ Charging efficiency.
For example: a 60kWh battery, charging from 20% to 80% (i.e., 60%), using a 7kW slow charger at 90% efficiency, requires charging time = 60 × 0.6 ÷ 7 ÷ 0.9 ≈ 5.7 hours.
How long does it take to fully charge a 60kWh battery?
- 7kW home slow charging: 7–8 hours (typical overnight charging)
- 11kW three-phase AC charger: 5–6 hours (faster daytime charging)
- 22kW dual-gun AC charger: About 3 hours
- 43kW industrial AC: Approximately 2.5 hours (actual active input ≈40.5kW)
- 60–100kW DC fast charging: 30–50 minutes (0→80%, corrected for CCCV curve)
- 120kW commercial GB-standard: About 25 minutes (0→80%, ~30 minutes after CCCV correction)
- 160kW dual-gun fast charging: 18–20 minutes (0→80%)
- 240–480kW ultra-fast charging: 8–15 minutes (0→80%, requires medium-voltage distribution; 0→100% roughly doubles due to trickle phase)
Why is 0→100% more than twice as long as 0→80%?
DC fast charging (60kW+) follows the CCCV charging curve: 0–20% is the current ramp-up phase (average power ≈ 65% of peak), 20–80% is the peak power plateau, and 80–100% is the constant-voltage trickle phase (average power ≈ 35% of peak). This tool applies segmented integration corrections for DC tiers ≥60kW — the 20→80% range is not corrected, 0→80% is approximately 13% slower than a linear model, and 0→100% is approximately 48% slower. AC slow charging (≤43kW) is nearly constant-power throughout, requiring no correction.
Why might actual charging time still be longer than calculated?
The CCCV model is already an engineering-grade approximation, but actual time is affected by additional compounding factors: ① Charging losses (actual efficiency 85–92%, below the ideal value); ② Temperature effects (low temperatures reduce battery activity, slowing charging by 10–30%); ③ Charger current limiting (insufficient capacitance in older neighborhoods — an 11kW charger may only deliver 7kW); ④ BMS protection (active power reduction during high temperatures or high SOC).
Does fast charging damage the battery?
Frequent use of DC fast charging above 120kW accelerates battery degradation, but home 7kW/11kW slow charging has almost no impact. Recommendation: Daily 80% shallow charge/discharge + once-per-month full charge for calibration maximizes battery lifespan.
Should I choose a 7kW or 11kW EV charger?
- 7kW: Works with single-phase 220V meter, no three-phase application needed — the mainstream home solution
- 11kW: Requires a three-phase 380V meter, 57% faster charging — suitable for frequent commuters
- Sizing formula: Charging time budget = Capacity ÷ Power — choose 7kW for once-per-week charging, 11kW for 2–3 times per week
Which vehicle models does the calculator support?
Supports all EVs with GB/T interface, including Tesla Model 3/Y/S/X (adapter required), BYD Han/Dolphin/Yuan PLUS, Xiaopeng P7/G6, NIO ET5/ES6, Li Auto L7/L9, and more. Simply enter the vehicle battery capacity to estimate.