Realistic specifications of some good EUCs

[nomad]

Noted this down for my own reference but I thought it might be a good idea to post it.. EUCs are amazing but the official specifications tend to be too optimistic... This is a jab at a basic overview of some good wheels, to see what might be expected realistically.. The list is sorted by max possible torque. More "Peak power" and smaller "Tire diameter" should give more possible torque. Higher "Motor rating" should give higher possible speed. Some info is missing and I don't guarantee that everything is correct.. The list is partly theoretical but show some interesting design choices, it's also meant to show the contrast between realistic values and marketing. It's not supposed to replace real world testing!

 

Ninebot One E+ (320Wh)

Tire diameter: 16"
Cruising speed: 21 km/h
Typical range: 20 km
Weight: 14 kg
Motor rating: 500 W
Peak power: 1100 W

 

Ninebot S2 (310Wh)

Tire diameter: 14"
Cruising speed: 21 km/h
Typical range: 20 km
Weight: 12 kg
Motor rating: 500 W
Peak power: 1100 W

 

IPS 191 Lhotz (340Wh)

Tire diameter: 16"
Cruising speed: ?? km/h
Typical range: 20 km
Weight: 14 kg
Motor rating: 1000 W
Peak power: 1300 W

 

King Song KS14D (420Wh)

Tire diameter: 14"
Cruising speed: ?? km/h
Typical range: 25 km
Weight: 13 kg
Motor rating: 800 W
Peak power: 1300 W

 

Inmotion V8 (480Wh)

Tire diameter: 16"
Cruising speed: 24 km/h
Typical range: 30 km
Weight: 14 kg
Motor rating: 800 W
Peak power: 1600 W

 

Inmotion V5F+ (480Wh)

Tire diameter: 14"
Cruising speed: 22 km/h
Typical range: 30 km
Weight: 12 kg
Motor rating: 550 W
Peak power: 1600 W

 

King Song KS18 (840Wh)

Tire diameter: 18"
Cruising speed: ?? km/h
Typical range: 55 km
Weight: 20 kg
Motor rating: 1200 W
Peak power: 2600 W

 

Gotway Msuper v3 (820Wh)

Tire diameter: 18"
Cruising speed: 35 km/h
Typical range: 50 km
Weight: 20 kg
Motor rating: 1500 W
Peak power: 2600 W

 

King Song KS16S (820Wh)

Tire diameter: 16"
Cruising speed: ?? km/h
Typical range: 50 km
Weight: ?? kg
Motor rating: 1200 W
Peak power: 2600 W

 

Gotway ACM (820Wh)

Tire diameter: 16"
Cruising speed: 35 km/h
Typical range: 50 km
Weight: 18 kg
Motor rating: 1500 W
Peak power: 2600 W

 

Rockwheel GT16 (680Wh)

Tire diameter: 16"
Cruising speed: ?? km/h
Typical range: 45 km
Weight: ?? kg
Motor rating: 2000 W
Peak power: 2600 W

 

Rockwheel GT16 (858Wh)

Tire diameter: 16"
Cruising speed: ?? km/h
Typical range: 55 km
Weight: ?? kg
Motor rating: 2000 W
Peak power: 3200 W

 

Gotway Monster (1600Wh)

Tire diameter: 22"
Cruising speed: 45 km/h
Typical range: 100 km
Weight: 25 kg
Motor rating: 1600 W
Peak power: 4800 W

 

Gotway Msuper v3s+ (1600Wh)

Tire diameter: 18"
Cruising speed: 45 km/h
Typical range: 100 km
Weight: 22 kg
Motor rating: 1600 W
Peak power: 4800 W

 

King Song KS18 (1680Wh)

Tire diameter: 18"
Cruising speed: ?? km/h
Typical range: 105 km
Weight: ?? kg
Motor rating: 1200 W
Peak power: 5100 W

 

Gotway ACM (1600Wh)

Tire diameter: 16"
Cruising speed: 45 km/h
Typical range: 100 km
Weight: 20 kg
Motor rating: 1600 W
Peak power: 4800 W

 

Gotway Monster (2400Wh)

Tire diameter: 22"
Cruising speed: 45 km/h
Typical range: 150 km
Weight: 29 kg
Motor rating: 1600 W
Peak power: 8000 W

 

* "Cruising speed":

highest possible speed (GPS) without tiltback and/or alarm activation

 

* "Typical range":

25 km/h urban commuting, 70kg rider, not aggressive riding, not offroad, 15°C ambient temperature, not hilly, not windy, new batteries (5km rounded).

- Calculation:
capacity Wh / 16

Inmotion V8 example:
480Wh / 16 = 30km

 

* "Peak power":

fully charged, new batteries (100W rounded).

Calculation:
battery pack voltage (serial) * number of packs (parallell) * nominal discharge rate * 95% switching efficiency

Rockwheel GT16 (858Wh) example:
84V * 4packs * 10A * 0.95 = 3192W

The standard battery cells used in EUCs have up to 10 Ampere discharge rate. If the cells are connected in serial then only 10A can get through, no matter how many cells are in the pack, as the current must pass through all cells in serial. So each battery pack can output max 10A current.

16-cell pack = 67.2V * 10A = 672W
20-cell pack = 84V * 10A = 840W

~95% efficiency (~5% lost in heat mainly mosfets)

[Slaughthammer]

16 hours ago, nomad said:

 

IPS 191 Lhotz (340Wh)

Tire diameter: 16"
Cruising speed: ?? km/h
Typical range: 20 km
Weight: 14 kg
Motor rating: 1000 W
Peak power: 1300 W

I never got more than 13 km out of that battery, but I never ride under 20 kph. If you go slow and take sime brakes, 16 km are possible (80 kg rider). Cruising speed is 23 kph, then beeping starts. If the battery is full, the road level and flat, one can go faster, maybe up to 27 kph, tiltback will start at 29-30 kph with full battery, and at 23 kph with battery below 30% under load. Powerwise, I think it compares more to other wheels with 500W rated cont. power, 1000W is most likely only a peak value.

 

16 hours ago, nomad said:

* "Peak power":

fully charged, new batteries (100W rounded).

Calculation:
battery pack voltage (serial) * number of packs (parallell) * nominal discharge rate * 95% switching efficiency

Why take nominal discharge rate for peak power? You calculate the max continious power the battery can sustain, not peak power. Those LiIons can easily deliver double of that for some seconds... though they do not like this if done regularly. On the really high powered wheel with large batteries, I doubt that this amount of power can pass the MosFETs without blowing them out, not even short term (8000W for the GW Monster!) Maybe you should rename that category as "maximum battery power output", that would be less misleading.