EV calculators
Charging time
Pick a model from the catalogue, set the charge window, and see how long the session actually takes at a given charging post's power.
%
The state of charge you start the session from.
%
The state of charge you end the session at.
Charging post power
The post's maximum rated power — the car never draws more than this, even where its own curve would allow it.
kW
Enter the station's real rating if it differs from the three typical values above — e.g. the power printed on a specific charger's spec sheet.
Result
Mercedes-Benz EQA 250 · curve calibrated to the claimed window 100 kW, 10–80%, 32 min
- Charging time
- 29 min
- Energy delivered
- 39.9 kWh
- Average power
- 83.8 kW
- Range added
- 238 km
curve calibrated to the claimed window 100 kW, 10–80%, 32 min
- Car's own power curve
- Power delivered at this post
| State of charge | Car's power | Delivered power |
|---|---|---|
| 10% | 115 kW | 115 kW |
| 14% | 115 kW | 115 kW |
| 17% | 115 kW | 115 kW |
| 21% | 115 kW | 115 kW |
| 24% | 115 kW | 115 kW |
| 28% | 111 kW | 111 kW |
| 31% | 106 kW | 106 kW |
| 35% | 102 kW | 102 kW |
| 38% | 98 kW | 98 kW |
| 42% | 93 kW | 93 kW |
| 45% | 89 kW | 89 kW |
| 49% | 87 kW | 87 kW |
| 52% | 84 kW | 84 kW |
| 56% | 81 kW | 81 kW |
| 59% | 79 kW | 79 kW |
| 63% | 76 kW | 76 kW |
| 66% | 73 kW | 73 kW |
| 70% | 69 kW | 69 kW |
| 73% | 65 kW | 65 kW |
| 77% | 62 kW | 62 kW |
| 80% | 58 kW | 58 kW |
Charging time FAQ
- How does the calculator know the charging power curve?
- Once you pick a model from the EvCompass catalogue, its usable battery capacity and charging power curve fill in automatically — there is no spec to type in yourself.
- Why does the post I pick change the time so much?
- A post never delivers more power than its own rating, even when the car's curve would allow more at that moment. On a 50 kW post, a car capable of 150 kW still charges at a speed capped at 50 kW for the whole session.
- Is the power curve measured by the manufacturer?
- No. When the curve is calibrated, it means we shaped it to match ONE claimed figure from the manufacturer's own data (e.g. 85 kW, 0-80%, 35 min) — that is one data point, not a measured charging run. Where no such figure exists, the curve is entirely estimated from the car's specs instead. Neither one is a measurement.