How to choose an electric car based on the performance indicators of the electric car.

Simple Calculation of electric vehicle performance indicators:

The following are several calculation formulas.

Formula 1:V = P/(g x 0. 09)(V: fastest speed P: rated power G: total load weight)(The higher the power, the faster the speed)

Formula 2:I = P/u(P: rated power U: battery voltage I: current)

Formula 3:T = Q/I(Q: Battery capacity I: cycling current)

Formula 4:S = vt(S: remaining mileage V: Vehicle Speed T: riding time)

Formula 5 => S = uq/0.09 Gbit/s(The larger the voltage and battery capacity, the longer the run, this is my focus)

Battery Capacity: such as 10ah. That is, if the discharge current is 10a, it can be discharged for one hour.

Demo:

for example, use 36v10ah battery and 999999 W rated power motor-designed electric vehicle, with a vehicle weight of 40 kg, in addition, the cyclists weigh 60 kg and the total load is 100 kg. Using Formula 1, we can estimate that the fastest riding speed is 20 km/h, formula 2 can be used to calculate that the current is 5A when the vehicle is at a speed of 20 km/h, and Formula 3 can be used to calculate that the maximum riding time of the vehicle is 2 hours, finally, we can use formula 4 to figure out that the maximum length of a car's ride is 40 km. If the accumulated power is used up for each ride, the battery life will be very short. Normal use will be charged if it does not exceed 60% of the power storage, in order to ensure the battery cycle life is more than 400 times, and the winter temperature is low, the battery temperature is less than 25 degrees, each low 1 degree, less charge into the power of 1%. That is to say, if you choose an electric car with a maximum riding distance of 40km, you must charge 24 kilometers during summer and 16.8 kilometers during winter. This still does not take into account the power consumption of the ramp and brake.