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Kelly KBL Brushless Motor Controller
Kelly KBL Brushless Motor Controller

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Kelly's programmable motor controllers provide efficient, smooth and quiet controls for electric vehicles like golf carts, go-carts, electric motorcycles, forklifts and hybrid vehicles, as well as electric boats and industrial motor speed control.
Product Details

Kelly KBL Brushless Motor Controller

Item # Item Name Voltage 1 Minute Current Regen Price
KBL24101X Kelly KBL24101X 12V-24V, 100A Brushless Motor Controller 12V-24V 100A Yes $173.63
KBL24151X Kelly KBL24151X 12V-24V, 150A Brushless Motor Controller 12V-24V 150A Yes $212.43
KBL24221X Kelly KBL24221X 12V-24V, 220A Brushless Motor Controller 12V-24V 220A Yes $270.63
KBL24301X Kelly KBL24301X 12V-24V, 300A Brushless Motor Controller 12V-24V 300A Yes $309.43
KBL24401X Kelly KBL24401X 12V-24V, 400A Brushless Motor Controller 12V-24V 400A Yes $484.03
KBL36101X Kelly KBL36101X 24V-36V, 100A Brushless Motor Controller 24V-36V 100A Yes $163.93
KBL36151X Kelly KBL36151X 24V-36V, 150A Brushless Motor Controller 24V-36V 150A Yes $212.43
KBL36221X Kelly KBL36221X 24V-36V, 220A Brushless Motor Controller 24V-36V 220A Yes $260.93
KBL36301X Kelly KBL36301X 24V-36V, 300A Brushless Motor Controller 24V-36V 300A Yes $348.23
KBL48101X Kelly KBL48101X 24V-48V, 100A Brushless Motor Controller 24V-48V 100A Yes $173.63
KBL48151X Kelly KBL48151X 24V-48V, 150A Brushless Motor Controller 24V-48V 150A Yes $212.43
KBL48221X Kelly KBL48221X 24V-48V, 220A Brushless Motor Controller 24V-48V 220A Yes $270.63
KBL48301X Kelly KBL48301X 24V-48V, 300A Brushless Motor Controller 24V-48V 300A Yes $309.43
KBL48401E Kelly KBL48401E 24V-48V, 400A Brushless Motor Controller 24V-48V 400A Yes $348.23
KBL48501E Kelly KBL48501E 24V-48V, 500A Brushless Motor Controller 24V-48V 500A Yes $387.03
KBL72101X Kelly KBL72101X 24V-72V, 100A Brushless Motor Controller 24V-72V 100A Yes $231.83
KBL72151X Kelly KBL72151X 24V-72V, 150A Brushless Motor Controller 24V-72V 150A Yes $270.63
KBL72221X Kelly KBL72221X 24V-72V, 220A Brushless Motor Controller 24V-72V 220A Yes $328.83
KBL72301X Kelly KBL72301X 24V-72V, 300A Brushless Motor Controller 24V-72V 300A Yes $387.03
KBL72401E Kelly KBL72401E 24V-72V, 400A Brushless Motor Controller 24V-72V 400A Yes $425.83
KBL72501E Kelly KBL72501E 24V-72V, 500A Brushless Motor Controller 24V-72V 500A Yes $503.43
KBL96151 Kelly KBL96151 24V-96V, 150A Brushless Motor Controller 24V-96V 150A Yes $357.93
KBL96201 Kelly KBL96201 24V-96V, 200A Brushless Motor Controller 24V-96V 200A Yes $445.23
KBL96251 Kelly KBL96251 24V-96V, 250A Brushless Motor Controller 24V-96V 250A Yes $484.03
  • X = Extended performance
  • E = High efficiency

General Functions

  • Extended fault detection and protection. The LED flashing pattern indicates the fault sources.
  • Monitoring battery voltage. It will stop driving if the battery voltage is too high and it will progressively cut back motor drive power as battery voltage drops until it cuts out altogether at the preset “Low Battery Voltage” setting.
  • Built-in current loop and over current protection.
  • Configurable motor temperature protection range.
  • Current cutback at low temperature and high temperature to protect battery and controller. The current begins to ramp down at 90 Ccase temperature, shutting down at 100 C.
  • The controller keeps monitoring battery recharging voltage during regenerative braking, progressively cutting back current as battery voltage rises then cutting off regen altogether when voltage goes too high.
  • Maximum reverse speed is configurable to half of max forward speed.
  • Configurable and programmable with a host computer though RS232 or USB. Provide free GUI which can run on Windows XP/2000, Windows 7 and Vista (recommend using Kelly Standard USB To RS232 Converter).
  • Provision of a +5 volt output to supply various kinds of sensors, including Hall effect type.
  • 3 switch inputs which are activated by connection to Ground. Default to throttle switch, brake switch and reversing switch. Closing to ground is to activate.
  • 3 analog 0-5V inputs that default to throttle input, brake input and motor temperature input.
  • Pulsed reverse alarm output.
  • Main contactor driver. Cutting off the power if any fault is detected.
  • Current meter to display both drive and regen current. Save shunt!
  • Configurable boost switch. Enables the maximum output power achievable if the switch is turned on.
  • Configurable economy switch. Limits the maximum current to half if the switch is turned on. Boost and Economy used the same pin as J2-6 (brake-AN). Needless to say, you may not use J2-6 (brake-AN) as brake analog regen mode if you want to use Boost or Economy function. Boost or Economy can’t be enabled at the same time in the user program.
  • Maximum reverse power is configurable to half power.
  • Enhanced regen brake function. A novel ABS technique provides powerful and smooth regen.
  • Configurable 12V brake signal input, instead of motor temperature sensor.
  • Optional joystick throttle. A bi-symmetrical 0-5V signal for both forwarding and reversing. If software version is 0406 or above, joystick can can be enabled or disabled in the user program now.
  • Configurable motor over-temperature detection and protection with the recommended thermistor KTY84-130 or KTY83-122.
  • 3 hall position sensor inputs. Open collector, pull up provided.
  • Optional CAN bus. CAN bus is not included in KBL controller. By default, if customer don’t pay it.
  • Optional supply voltage 8-30V.
  • Cruise control. Can not be activated in reversing direction. If software version is 0406 or above, cruise control can be enabled or disabled in the user program now. If you hold throttle at certain position about 3-4 seconds, the controller will get into Cruise control.


  • Intelligence with powerful microprocessor.
  • Synchronous rectification, ultra low drop and fast PWM to achieve very high efficiency.
  • Electronic reversing.
  • Voltage monitoring on 3 motor phases, bus, and power supply.
  • Voltage monitoring on voltage source 12V and 5V.
  • Current sense on all 3 motor phases.
  • Current control loop.
  • Hardware over current protection.
  • Hardware over voltage protection.
  • Support torque mode, speed mode, and balanced mode operation.
  • Configurable limit for motor current and battery current.
  • Low EMC.
  • LED fault code.
  • Battery protection: current cutback, warning and shutdown at configurable high and low battery voltage.
  • Rugged aluminum housing for maximum heat dissipation and harsh environment.
  • Rugged high current terminals, and rugged aviation connectors for small signal.
  • Thermal protection: current cut back, warning and shutdown at high temperature.
  • Configurable 60 degree or 120 degree hall position sensors.
  • Support motors with any number of poles. Up to 40,000 electric RPM standard. Optional high speed 70,000 ERPM, and ultra high speed 100,000 ERPM. (Electric RPM = mechanical RPM * motor pole pairs).
  • Support three modes of regenerative braking: brake switch regen, release throttle regen, 0-5V analog signal variable regen.
  • Configurable high pedal protection: the controller will not work if high throttle is detected at power on.
  • Current multiplication: Take less current from battery, output more current to motor.
  • Easy installation: 3 wire potentiometer can work.
  • Remote fault code LED driver.
  • Current meter output.
  • Standard PC/Laptop computer is used to do programming. No special tools needed.
  • User program provided. Easy to use. No cost to customers.


  • Frequency of Operation: 16.6kHz.
  • Standby Battery Current: < 0.5mA.
  • 5V Sensor Supply Current: 40mA.
  • Controller supply voltage range, PWR, 8V to 30V for KBL 24V controllers. 18V to 90V for KBL controllers rated equal or lower than 72V. 18V to 120V for 96V controllers.
  • Configurable battery voltage range, B+. Max operating range: 18V to 1.25*Nominal Voltage for controller rated equal or higher than 36V. 8V to 30V for controller rated equal 24V.
  • Standard Throttle Input:
    • 0-5 Volts (3-wire resistive pot)
    • 1-4 Volts (hall active throttle)
  • Analog Brake and Throttle Input: 0-5 Volts. Producing 0-5V signal with 3-wire pot.
  • Reverse Alarm, Main Contactor Coil Driver, Meter.
  • Full Power Operating Temperature Range: 0°C to 50°C (controller case temperature).
  • Operating Temperature Range: -30°C to 90°C, 100°C shutdown (controller case temperature).
  • Boost Current, 10 seconds: 150A-550A, depending on the model.
  • Motor Current Limit, 1 minute: 100A-500A, depending on the model.
  • Motor Current Limit, continuous: 60A-200A, depending on the model.
  • Max Battery Current : Configurable.

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Price: $9.00

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Kelly Controller J1 Cable Kelly Controller J2 Cable

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