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
Renault 4 E-Tech 40kWh 120hp · curve calibrated to the claimed window 80 kW, 15–80%, 30 min
- Charging time
- 28 min
- Energy delivered
- 24 kWh
- Average power
- 50.8 kW
- Range added
- 147 km
curve calibrated to the claimed window 80 kW, 15–80%, 30 min
- Car's own power curve
- Power delivered at this post
| State of charge | Car's power | Delivered power |
|---|---|---|
| 15% | 78 kW | 78 kW |
| 18% | 78 kW | 78 kW |
| 22% | 78 kW | 78 kW |
| 25% | 78 kW | 78 kW |
| 28% | 78 kW | 78 kW |
| 31% | 74 kW | 74 kW |
| 35% | 69 kW | 69 kW |
| 38% | 65 kW | 65 kW |
| 41% | 61 kW | 61 kW |
| 44% | 56 kW | 56 kW |
| 48% | 52 kW | 52 kW |
| 51% | 50 kW | 50 kW |
| 54% | 48 kW | 48 kW |
| 57% | 46 kW | 46 kW |
| 61% | 45 kW | 45 kW |
| 64% | 43 kW | 43 kW |
| 67% | 41 kW | 41 kW |
| 70% | 39 kW | 39 kW |
| 74% | 37 kW | 37 kW |
| 77% | 35 kW | 35 kW |
| 80% | 33 kW | 33 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.