Estimate charging time while an EV heat pump or cabin climate system is drawing power. The result accounts for battery energy requested, charger efficiency, climate load, and an optional taper allowance.
Adjust the inputs to compare your EV charging or energy scenario.
Net battery power = charger power × efficiency − heat-pump draw. Time = battery energy needed ÷ net power × (1 + taper allowance).
This is a planning model; actual EV and charger performance can vary with temperature, equipment, and operating conditions.
The main result summarizes the modeled outcome from your inputs. Secondary results expose the energy, time, capacity, or cost components so you can identify which assumption drives the estimate.
A 75 kWh battery charging from 20% to 80% on 11 kW at 90% efficiency, with a 1.2 kW heat-pump draw and 8% allowance, takes about 5.59 hours.
| Input | Unit | Example |
|---|---|---|
| Usable battery capacity | kWh | 75 |
| Starting state of charge | % | 20 |
| Target state of charge | % | 80 |
| Charger power | kW | 11 |
| Charging efficiency | % | 90 |
| Heat pump draw while charging | kW | 1.2 |
| Taper/time allowance | % | 8 |
The energy, power, time, or utilization inputs that appear directly in the formula have the greatest effect. Change one input at a time to compare scenarios.
No. It is a planning estimate based only on the values you enter and does not connect to a vehicle, battery-management system, charger, or utility account.
Enter percentages as displayed numbers, such as 90 for 90%. The calculator converts them to decimal form internally.
Temperature, battery conditioning, charging curves, vehicle limits, tire condition, station sharing, fees, and driving conditions can change real-world results.
Yes. Calculate the first scenario, note the results, then change one or more inputs. The reset button restores the example defaults.