Can a 48V motor be used with a 72V battery?
2 Answers
It cannot be used with a 72V battery because the voltage is too high and will burn out the motor. Here is an introduction about motors: "1. Introduction: A motor (English: Electric-machinery, commonly known as 'motor') refers to an electromagnetic device that realizes the conversion or transmission of electrical energy according to the law of electromagnetic induction. In a circuit, the motor is represented by the letter M (old standard uses D), and its main function is to generate driving torque as a power source for electrical appliances or various machinery. A generator is represented by the letter G in a circuit, and its main function is to convert mechanical energy into electrical energy. 2. Protector: The function of a motor protector is to provide comprehensive protection for the motor. It is a device that gives an alarm or protection when the motor experiences overload, phase loss, locked rotor, short circuit, overvoltage, undervoltage, leakage, three-phase imbalance, overheating, bearing wear, or stator-rotor eccentricity."
I've been in the DIY electric bike modification scene for many years, and I often see people trying to save money and boost speed by connecting a 72v battery to a 48v motor, but most end up in tragedy. Once, I tried it myself—the bike felt more powerful at startup, but before I could even ride five kilometers, I smelled something burning. When I stopped to check, the controller was smoking and burnt out. The repair cost me over a thousand bucks. The mechanic explained that excessive voltage is like choking while drinking water—the motor coils overheat and can easily burn out, potentially causing a short circuit or even a fire. Modifications like this are too risky, especially when voltages don’t match—it’s just asking for trouble. I advise average players not to mess around and to stick with the manufacturer-recommended battery setup to ensure safety. When it comes to improving electric bike performance, don’t cut corners for cheap thrills—safety should always come first. Nowadays, I recommend friends use voltage reducers or simply swap to a fully matched system—it’s worry-free and reliable.
