How long can a 350W motor with 48V20Ah run?
3 Answers
55-60 kilometers. A 48V20Ah battery paired with a 350W motor has an average constant current of 7.3A (motor power/voltage = 350W/48V), with a theoretical runtime of 2.7h (battery capacity/average current = 20Ah/7.3A), resulting in a theoretical range of 68 kilometers. Condition of the vehicle: The condition of the electric vehicle also affects its range. Even with a new battery, an old electric vehicle may struggle to maintain its original performance, primarily due to increased power loss in older models. Driving habits impact range: Driving habits can influence the range as well. For instance, maintaining a steady speed can maximize the range, while frequent acceleration and sudden braking will reduce it.
That's a good question. With a 350-watt motor paired with a 48V 20Ah battery, it generally lasts around two and a half to three hours. Calculating the battery capacity: 48 multiplied by 20 gives 960 watt-hours, divided by the motor power of 350 watts, resulting in approximately 2.74 hours. In actual riding conditions, maintaining an average speed of 20 km/h, the range is roughly 55 to 70 kilometers. I think weight has a significant impact—when I ride at 75 kg, I can cover over 60 kilometers, but with a backpack or carrying a passenger, it drops below 50 kilometers. Uphill sections consume a lot of power, while flat roads save some energy and extend the range a bit. Temperature is also crucial—battery performance drops quickly in cold winter weather, significantly reducing the range. I recommend new riders buy an electric bike with a battery level display for real-time monitoring. Don’t slack on regular maintenance—check battery connections periodically to ensure no poor contact.
I have a personal experience to share with you. I used to commute to work with an electric bike of this configuration, which could run about 60 kilometers on a full charge, equivalent to a round-trip commute of 20 kilometers per day for three days without any issues. Maintaining a speed of 25 kilometers per hour is the most cost-effective, as going faster doubles the power consumption. One weekend, I took a friend out, and with our combined weight increasing by ten kilograms, the bike ran out of power after just 40 kilometers, which was quite embarrassing. Uphill sections are even more challenging—what lasts three hours on flat ground might not even make it two hours on mountainous roads. For daily use, avoid draining the battery completely before recharging; keeping about 20% charge can extend the battery's lifespan. A new bike can go farther, but with an older battery whose capacity drops to 18 ampere-hours, you'll need to charge it more frequently. I recommend fellow riders develop a habit of maintaining a steady speed and avoid sudden acceleration.
