250W vs 350W Electric Cycle: What Motor Power Means for Your Daily Ride

Most electric cycles in India come with a 250W motor. Most EMotorad cycles now come with a 350W motor.

So what does the extra 100W do for you? Simply put, it gives you more help when the ride gets hard: on a flyover, up a basement ramp, when you carry a bag, or when you ride against the wind.

We didn't want to just say it. We tested it. We put our new 350W motor and a typical 250W market motor on the same lab machine and compared them. Here is what we found.

Watts tell you how much work a motor can do. More watts means more help from the motor when the road gets tough.

On a flat road at an easy speed, a 250W and a 350W motor feel quite similar. Neither one is working hard. The difference shows up when the load goes up: a slope, a heavier rider, a bag on the carrier, or a strong wind. A weaker motor runs out of strength and you have to pedal harder. A stronger motor keeps helping you.

A few terms you will see on spec sheets:

• Rated power: the power the motor is built to give comfortably, all day. This is the number on the spec sheet. Our new motor is rated at 350W.
• Peak power: the most power the motor can give for a short time, like when you hit a steep ramp.
• Torque (Nm): the turning force of the motor. It helps you start from a stop and climb hills.
• Controller: the motor's brain. It decides how much current goes to the motor. A good motor with a weak controller still feels weak.

• Flyovers and steep ramps. This is the big one. On a steep-climb load in our test, our motor still gave about 368W. The 250W motor dropped to about 206W. That is almost 80% more help when you need it most.
• Starting from a signal. A stronger push when you start, especially with a backpack or a loaded carrier.
• Heavier riders and loads. The motor struggles less with extra weight. (Always stay within your model's load limit.)
• Headwinds and long rides. The motor keeps helping instead of fading, so you reach home less tired.

We tested five units of our 350W motor (model 90SZ) and two units of a popular 250W market motor. Both ran on the same lab machine (a motor dyno) at the same 36V battery voltage. The machine first lets the motor spin freely. Then it adds load step by step, like a road that keeps getting steeper, until the motor almost stops.

In short: about 50% more peak power, and almost 80% more power on a steep climb. All five of our motors gave between 369W and 374W, so this was not one lucky motor.

It also uses battery power well. At its best, our motor turned 79.2% of the battery's energy into motion. The 250W motor managed 77.1%. So you get more power without wasting more energy.

These are the actual reports from the lab machine, one for each motor. They look technical, but you only need to check two things: power and torque. We have circled them in red.

• Circle 1, peak power: 374.10W. Look at the T(N.m) column in the same row: our motor gave this peak power at 21.26 Nm, which is a heavy load. It stays at full strength even on a steep climb.
• Circle 2, max torque: 40.02 Nm. Even at this heavy load, the motor was still turning at 40 rpm and still giving 167.64W of power.

• Circle 1, peak power: 240.11W, reached at only 13.57 Nm. Push it harder than that and its power starts to drop.
• Circle 2, max torque: 37.81 Nm, but by then the motor was turning at just 8 rpm and giving only 31.68W. It had almost stopped. The last row (The End) shows 0 rpm: the motor stalled.

What this means for you: on a steep flyover, our motor keeps pulling while the 250W motor is close to giving up.

[Note: each report is from one motor unit. The numbers in the table above are averages across all units we tested, so they are slightly different.]

A fair question: would the 250W motor do just as well with a better controller?

So we fitted our 13A controller to the market motor. Its peak power went up from 243W to 336W. That is a 38% jump from the controller alone. Its own controller was holding it back to about 8.8A of current. Ours sends about 12.4A.

But here is the important part. As we pushed more current into it, the market motor started making noise and then stopped. It was not built to handle that much power. Even at its best, it was still 35W behind our motor.

That is why we design our motor and controller together. Each one is built to work with the other.

To see how far each motor could go, we also ran both at 48V. Our motor reached 619W, while the market motor reached 426W, at almost the same current. Our motor also reached 53.4 Nm of torque against 35.4 Nm, and was more efficient (81.5% vs 75.4%). This is a lab stress test, not how our cycles run on the road. But it shows how much extra strength our motor has.

On flat roads at easy speeds, you may not feel a big difference. On flyovers, ramps, with heavier loads or against the wind, yes. In our test, our motor gave almost 80% more power on a steep-climb load than a typical 250W motor.

Most of our range now runs on a 350W motor. Here is the full list:

Not really. Range depends on battery size, speed, assist level, rider weight and the route. Our motor was also more efficient in the lab (79.2% vs 77.1% at its best), so it does not waste extra energy to give you more power.

No. All electric cycles in India are capped at 25 km/h by law. What you get is much quicker pickup and stronger help on climbs and with load.

Yes, that is where it helps the most. Extra power matters most when the motor is working hard. Just stay within your model's load limit.

Lab numbers are one thing. Feeling the cycle pull you up your own flyover is another. Book a test ride at your nearest EMotorad dealer, ride it on your daily route, and feel the difference yourself.