How big is the battery for a 400w electric bicycle motor?

The 400w motor can run 45km/h when the speed limit is lifted.

Generally speaking, under the new national speed limit, a 400W motor equipped with a 48V350W controller has a maximum speed of only 25km/h. If equipped with a 60V battery and (600W) 9-tube controller, the maximum speed can reach 32km/h. Switch to an 800W controller, and the top speed can reach 35-38km/h.

In order to protect the service life of the motor and battery. If the electric vehicle often works overclocked. If the motor is overloaded under high current, it is easy to generate high temperature, which will accelerate the demagnetization of the motor and greatly shorten its service life. At the same time, high current discharge will also accelerate the loss of the battery, thus increasing your own cost of use!

It is related to the current limit of the electric vehicle controller. Usually the current limit of the controller is 28A, 30A and 33A. The controller is the core component of the motion control system. The greater the current limit. , the faster.

The motor output power is 800W, and the car’s speed is about 40 kilometers/hour; 1500W output, the speed is about 52; 2000W output, the speed is about 58; 3000W output, the speed is about 65.

Battery overvoltage, for example, the speed at 48V is 40, when it exceeds 60V, the speed is 50 (actually increased by 8), when it exceeds 72V, the speed is 60, when it exceeds 84V, the speed is 70, etc. .

The electric vehicle controller is the core control device used to control the start, operation, advance and retreat, speed, stop of the electric vehicle motor and other electronic devices of the electric vehicle. It is like the brain of the electric vehicle. Important components on electric vehicles.

Yes. 48V is more power-saving.

Many users think that 60V electric vehicles must have a longer range than 48V electric vehicles, because the greater the battery voltage, the farther the electric vehicle will last. However, this idea is wrong, because the battery life of electric vehicles is not only related to The battery voltage is related to the battery capacity, load, motor, etc. Let’s explain it in detail below.

Let’s first look at 60V electric vehicles. The mainstream battery models are 60V20Ah and 60V32Ah, and they are generally equipped with 600W motors, and the average speed is generally 40km/h.

Take a 60V20Ah electric vehicle as an example. According to calculations, we can know that its average current at a constant speed is 10A (motor power/voltage), and its theoretical driving time is 2h (battery capacity/average current at a constant speed). The theoretical battery life can reach 80km. In the same way, we can get a 60V32Ah electric vehicle with a theoretical range of 128km.

Let’s look at 48V electric vehicles. The mainstream battery models are 48V12Ah, 48V20Ah, and 48V32Ah. They are generally equipped with 350W motors, and the average speed is generally only 25km/h. Taking a 48V12Ah electric vehicle as an example, through calculation we can find that its theoretical range can reach 41km. In the same way, the theoretical battery life of a 48V20Ah electric vehicle is 68km, while the theoretical battery life of a 48V32Ah electric vehicle can reach 110km.

To sum up, 60V20Ah electric vehicles generally have a longer battery life than 48V20Ah and 48V12Ah electric vehicles, but their battery life is lower than that of 48V32Ah electric vehicles. Therefore, this shows that 60V electric vehicles can only last longer than 48V electric vehicles when their capacity is the same or larger.

Finally, let’s look at some actual models. For example, the Xiaoluo model launched by Xiaodao is equipped with a 350W motor, 48V12Ah battery, and a battery life of 45km.

The iCheng Q500 launched by Emma is equipped with an 800W motor, 60V20Ah battery, and a battery life of 75km. In addition, Emma also launched a Geek X100, which is equipped with a 400W motor, 48V28Ah lithium battery and a battery life of 120km. We can also know from this that 60V electric vehicles do not necessarily have a longer range than 48V electric vehicles.