How fast can a 7255 with an 800W motor run?

[Ronan]

The typical speed of a 7255 with an 800W motor is between 35 km/h and 40 km/h. Methods to increase speed: By removing the voltage limit of the controller and increasing the current, the motor's speed can be improved. After removing the speed limit, the maximum speed can reach around 50 km/h. Using a new 84V battery, an 800W motor can achieve speeds above 60 km/h. Charging precautions: Normally, avoid charging for too long. In summer, high temperatures increase the risk of thermal runaway in the battery. It is best to charge for 6 to 8 hours based on time. If the battery is not used for a long time, it is recommended to recharge it every two months to avoid irreversible sulfation due to prolonged discharge, which can kill the battery. After 6 months to a year of use, it is advisable to add replenishing fluid to the battery to extend its lifespan.

[DiAxel]

When it comes to how fast a 7255 controller can push an 800W motor, I believe several factors come into play—voltage, battery condition, and vehicle weight are all crucial. A 72V controller with a 55A current theoretically delivers substantial output power, but with the motor capped at 800W, the actual speed typically ranges between 45 to 55 km/h. On flat roads with light loads, it might hit around 52 km/h, while uphill or under heavy loads, it could drop below 40 km/h. With proper controller tuning, the acceleration is quite brisk, but high speeds drain the battery quickly, accelerating its aging. Having tested this setup often, I recommend using a GPS speedometer for real-world measurements. It’s perfectly adequate for daily commuting—just don’t expect racing-level performance. Adding wind resistance protection can slightly improve efficiency, but the real joy lies in balancing performance and range.

[Jaden]

I've used a similar configuration with a 7255 controller and an 800-watt motor. The daily driving experience is good, with a stable speed between 40 to 50 kilometers per hour. The 72-volt voltage provides ample power, and although the controller has a high current, the motor's power limit constrains the actual output. Cruising on flat roads is very comfortable, and the starting response is excellent. When going uphill, the speed noticeably drops to around 35 kilometers per hour, so it's advisable to control the weight, such as avoiding heavy loads. The condition of the battery has a significant impact—new batteries can reach a peak speed of 55 kilometers per hour, while older ones might only manage 40. For commuting, it's recommended to drive at moderate speeds to save power, equip a braking system for safety maintenance, and remember that legal speed limits are often below 60 kilometers per hour.

[VeraLee]

Regarding the speed of the 7255 controller pulling an 800W motor, the core influences are the system and environment. The 72V high voltage provides thrust, but the motor power is fixed, fluctuating between approximately 40 to 60 km/h. On a lightweight bike on flat roads, it has been tested to exceed 55 km/h, but with load or wind, it can drop to 40 km/h. Pay attention to controller matching, as adjusting parameters affects output, and don’t overlook heat dissipation to prevent overheating. I emphasize safety—high-speed risks are significant, especially on wet roads. Check tire and battery health. Speed isn’t the only factor; balancing range is crucial.

[TaylorFitz]

From a practical perspective, the speed of a 7255 pulling an 800W motor is estimated to be between 40 to 55 kilometers per hour. In terms of cost-effectiveness: high speeds require larger batteries, increasing expenses, while slower speeds save power and extend lifespan. The 72-volt system has a solid foundation, but its weight and performance on slopes can slow it down, such as dropping to around 35 km/h when climbing. I recommend optimizing performance with moderate cruising speeds, and pairing it with lightweight modifications for a slight speed boost. Pay attention to regulations, as speeding fines are not worth it. Battery maintenance saves on repair costs, and the essence of enjoying the ride lies in steadiness rather than aggressiveness.