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.

Lotus Eletre S · curve calibrated to the claimed window 350 kW, 10–80%, 20 min

Charging time: 26 min
Energy delivered: 65.4 kWh
Average power: 149.8 kW
Range added: 288 km

curve calibrated to the claimed window 350 kW, 10–80%, 20 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%	353 kW	150 kW
14%	353 kW	150 kW
17%	353 kW	150 kW
21%	353 kW	150 kW
24%	353 kW	150 kW
28%	331 kW	150 kW
31%	309 kW	150 kW
35%	287 kW	150 kW
38%	264 kW	150 kW
42%	242 kW	150 kW
45%	220 kW	150 kW
49%	214 kW	150 kW
52%	208 kW	150 kW
56%	201 kW	150 kW
59%	195 kW	150 kW
63%	189 kW	150 kW
66%	180 kW	150 kW
70%	171 kW	150 kW
73%	162 kW	150 kW
77%	152 kW	150 kW
80%	143 kW	143 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