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 SQ8 Sportback e-tron · curve calibrated to the claimed window 170 kW, 10–80%, 31 min

Charging time: 29 min
Energy delivered: 63.6 kWh
Average power: 134.1 kW
Range added: 288 km

curve calibrated to the claimed window 170 kW, 10–80%, 31 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%	178 kW	150 kW
14%	178 kW	150 kW
17%	178 kW	150 kW
21%	178 kW	150 kW
24%	178 kW	150 kW
28%	174 kW	150 kW
31%	169 kW	150 kW
35%	165 kW	150 kW
38%	160 kW	150 kW
42%	156 kW	150 kW
45%	151 kW	150 kW
49%	147 kW	147 kW
52%	142 kW	142 kW
56%	138 kW	138 kW
59%	133 kW	133 kW
63%	129 kW	129 kW
66%	123 kW	123 kW
70%	117 kW	117 kW
73%	110 kW	110 kW
77%	104 kW	104 kW
80%	98 kW	98 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