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
BYD DOLPHIN SURF 30 kWh Active · curve calibrated to the claimed window 65 kW, 10–80%, 30 min
- Charging time
- 27 min
- Energy delivered
- 18 kWh
- Average power
- 39.7 kW
- Range added
- 114 km
curve calibrated to the claimed window 65 kW, 10–80%, 30 min
- Car's own power curve
- Power delivered at this post
| State of charge | Car's power | Delivered power |
|---|---|---|
| 10% | 63 kW | 63 kW |
| 14% | 63 kW | 63 kW |
| 17% | 63 kW | 63 kW |
| 21% | 63 kW | 63 kW |
| 24% | 63 kW | 63 kW |
| 28% | 59 kW | 59 kW |
| 31% | 56 kW | 56 kW |
| 35% | 52 kW | 52 kW |
| 38% | 48 kW | 48 kW |
| 42% | 45 kW | 45 kW |
| 45% | 41 kW | 41 kW |
| 49% | 40 kW | 40 kW |
| 52% | 39 kW | 39 kW |
| 56% | 38 kW | 38 kW |
| 59% | 36 kW | 36 kW |
| 63% | 35 kW | 35 kW |
| 66% | 33 kW | 33 kW |
| 70% | 32 kW | 32 kW |
| 73% | 30 kW | 30 kW |
| 77% | 28 kW | 28 kW |
| 80% | 26 kW | 26 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.