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.

Charging time

Start of charge (%)

The state of charge you start the session from.

End of charge (%)

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.

Custom station power (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.

Audi A6 Sportback e-tron (2025) · curve calibrated to the claimed window 225 kW, 10–80%, 21 min

Charging time: 21 min
Energy delivered: 45.5 kWh
Average power: 133.3 kW
Range added: 292 km

curve calibrated to the claimed window 225 kW, 10–80%, 21 min

Car's own power curve
Power delivered at this post

The car's own power and the power actually delivered at the chosen post, by state of charge
State of charge	Car's power	Delivered power
10%	221 kW	150 kW
14%	221 kW	150 kW
17%	221 kW	150 kW
21%	221 kW	150 kW
24%	221 kW	150 kW
28%	209 kW	150 kW
31%	197 kW	150 kW
35%	185 kW	150 kW
38%	173 kW	150 kW
42%	161 kW	150 kW
45%	149 kW	149 kW
49%	145 kW	145 kW
52%	140 kW	140 kW
56%	136 kW	136 kW
59%	132 kW	132 kW
63%	128 kW	128 kW
66%	122 kW	122 kW
70%	116 kW	116 kW
73%	109 kW	109 kW
77%	103 kW	103 kW
80%	97 kW	97 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.

Result

Charging time FAQ