This post defines the 72V ONYX Kelly SICKO MODE build as a complete system.
It explains how the Kelly controller, battery, motor, wiring, and cooling all interact when increasing power beyond stock limits.
- Confirm the battery, wiring, connectors, motor, and cooling before modified operation
- Understand all limits before increasing power
- Build in stages and verify each change
Controller Overview
| Item | Specification |
|---|---|
| Controller | Kelly KLS7230S |
| Stock Output | ~7.2 kW |
| Maximum Output | ~24 kW |
| Communication | Bluetooth / RS232 |
| Programming Software | Motormed / AC Aduser |
Quick Overview
| Rule | Meaning |
|---|---|
| Voltage | Determines top speed ceiling |
| Phase Amps | Creates launch torque |
| Battery Amps | Creates battery heat and stress |
| Back EMF | Causes acceleration to fade at high speed |
| Field Weakening | Increases speed but adds heat |
| Regen | Entirely software controlled |
| Temperature | True continuous power limit |
Understanding these fundamentals allows the Kelly controller to safely produce more power without damaging the battery, motor, or controller.
Power and System Behavior
Power in the ONYX system is controlled by the interaction between voltage, current, and heat.
- Voltage determines maximum speed
- Phase current determines torque
- Battery current determines total power draw
- Heat determines how long power can be sustained
As power increases:
- battery stress increases
- controller heat increases
- motor heat increases
All three must be managed together.
System Limits
Every component in the system has limits:
- Battery -> discharge capability and voltage sag
- Controller -> current handling and thermal limits
- Motor -> heat saturation and efficiency
- Wiring and connectors -> current capacity and resistance
Exceeding any one of these limits can cause:
- performance loss
- overheating
- component failure
Build Strategy
SICKO MODE is not a single setting.
It is a system-level configuration.
Best practice:
- increase power gradually
- verify behavior after each change
- monitor temperature and voltage
- confirm stability before increasing further
Final Advice
Learn voltage, current, and heat before chasing speed.
Tune one setting at a time.
Respect battery limits.
Monitor temperatures.
Remember:
- Controllers are replaceable
- Motors are expensive
- Batteries are hardest to recover
Build in layers, test between changes, and let temperature be your guardrail.