This guide explains how ONYX bikes actually produce power and how voltage, current, controllers, and components translate into real-world performance.
Instead of thinking in gas terms like horsepower alone, ONYX performance is best understood through three core variables:
- voltage (V)
- battery current (line amps, DC)
- motor current (phase amps, AC)
Quick Summary
- Voltage sets the speed ceiling
- Line amps determine total power
- Phase amps determine torque
- Battery quality determines voltage sag and consistency
- Controllers control how power is delivered
- Heat is the real limiting factor
What Horsepower Means on ONYX
- 1 kW = 1.341 HP
Power (kW) = Voltage (V) × Current (A)
This applies to the DC side (battery output).
On the motor side, power depends on phase current, voltage, and efficiency.
Real-world power is always lower due to losses in:
- controller
- motor
- wiring
The 3 Variables That Control Performance
| Variable | What it affects | ONYX meaning |
|---|---|---|
| Voltage | Speed ceiling | Higher voltage increases max RPM |
| Line Amps | Total power | Battery output limit |
| Phase Amps | Torque | Motor force |
Voltage and Speed
Voltage sets the maximum motor speed based on the motor KV rating.
Actual top speed depends on:
- motor winding
- load
- aerodynamics
- controller tuning
- field weakening
Line Amps vs Phase Amps
- Battery provides line amps (DC)
- Controller outputs phase amps (AC)
At low speed:
- phase amps are higher
- torque is strong
At high speed:
- phase and line amps converge
This behavior depends on controller design and load.
How Power Builds
Low Speed
- high phase amps
- low voltage
- strong torque
High Speed
- voltage approaches max
- current becomes limit
- power shifts to speed
72V vs 80V Systems
| System | Nominal | Full | Advantage |
|---|---|---|---|
| 72V | ~72V | ~84V | Balanced |
| 80V | ~80V | ~91V | Higher speed |
Key Difference
- Same amps, more voltage = more power
- 80V holds power better at speed
Real Power Example (80V)
- 91V × 200A = 18 kW theoretical
Actual output is lower due to sag and losses.
Why Performance Drops as Battery Drains
- voltage decreases
- total power decreases
- speed and acceleration drop
Example:
- 91V × 200A = 18.2 kW
- 80V × 200A = 16.0 kW
Voltage Sag and Battery Quality
Voltage sag:
V_drop = Current × Resistance
Higher current increases voltage drop.
Stock Battery
- higher resistance
- more sag
- inconsistent performance
AMORGE 50XG (Tabless)
- low resistance
- reduced sag
- high sustained output
- better thermal performance
AMORGE 50XG Battery Configurations
| System | Capacity | Continuous | Peak |
|---|---|---|---|
| 72V | 50Ah | 420A | 600A |
| 72V | 45Ah | 420A | 540A |
| 84V | 40Ah | 400A | 480A |
| 96V | 35Ah | 350A | 420A |
Controller Comparison
| Controller | Strength | Limitation |
|---|---|---|
| Kelly | reliable, simple | limited performance |
| FarDriver 680 | strong mid-tier | tuning complexity |
| FarDriver 1000 | extreme power | requires full build |
Controllers do not create power. They control how it is delivered.
Motor Upgrades (QS Series)
- QS260 V4
- QS273 V4
Motor performance depends on:
- KV rating
- thermal capacity
- magnetic limits
Field Weakening
Field weakening increases top speed beyond base voltage.
Tradeoffs:
- reduced efficiency
- increased heat
- reduced torque at speed
Wiring and Connector Limits
- XT60 → low power
- XT90 → mid power
- QS8 / QS9 / QS10 → high power
Undersized wiring causes:
- heat
- voltage loss
- connector failure
System Matching (Critical Concept)
Your system is only as strong as its weakest component.
Examples:
- strong battery + weak controller = wasted power
- strong controller + weak battery = voltage sag
- strong motor + weak system = underutilized
Tuning Strategy (Practical)
Want more acceleration:
- increase phase amps
Want more top speed:
- increase voltage
Want more total power:
- increase line amps
Want consistency:
- upgrade battery
What Different Power Levels Feel Like
| Power | Feel |
|---|---|
| 5 kW | stock, mild |
| 10 kW | strong street |
| 20 kW | aggressive |
| 30 kW+ | extreme, traction limited |
Build Tiers
Stock
- 3 to 5 kW
Mild
- 6 to 10 kW
High Performance
- 12 to 20 kW
Advanced
- 20 kW to 30 kW+
- FarDriver
- QS260 / QS273
- AMORGE 50XG
Real Example Builds
| Setup | Voltage | Current | kW |
|---|---|---|---|
| 72V Stock | 72V | 50A | 3.6 |
| 72V Mod | 72V | 100A | 7.2 |
| 80V | 80V | 100A | 8.0 |
| 80V Performance | 91V | 200A | 18.2 |
| 84V AMORGE | 84V | 300A | 25.2 |
| 96V AMORGE | 96V | 350A | 33.6 |
Peak vs Sustained Power
- peak power is short duration
- sustained power is limited by heat
Heat in:
- motor
- controller
- battery
determines real performance.
Failure Modes (What Breaks First)
At higher power:
- controller overheats or limits
- battery sags or BMS cuts
- motor overheats
- connectors melt
- dropouts experience stress
Safe Power Limits
As power increases:
- thermal limits dominate
- mechanical stress increases
- electrical losses increase
Upgraded systems can push far beyond stock, but require:
- proper components
- cooling
- balanced design
Why ONYX Feels Faster Than Numbers
- instant torque
- no gears
- high low-speed current
- efficient delivery
Common Misunderstandings
- Voltage does not directly create torque
- Phase amps are not free power
- More current = more heat
- Battery quality matters as much as voltage