ASI BAC2000 Controller – FOC Sensorless 180A Inverter for Sur-Ron & Talaria

The ASI BAC2000 controller is an ultra-compact AC motor controller (inverter) built for high-power electric motorcycles and light electric vehicles. It is designed for the Sur-Ron Light Bee, the Talaria Sting and similar brushless PMSM motors. The unit operates across a 36-72 V range and delivers 180 A continuous current with a 200 A peak.

A controller is the brain of any electric drivetrain. It converts direct current from the battery pack into three-phase alternating current for the motor. Therefore, torque delivery, top speed and thermal behaviour all depend directly on the controller you fit. The BAC2000 handles this using field oriented control (FOC) paired with the ASI adaptive sensorless algorithm.

Within the ASI BAC family, the BAC2000 sits in the upper-middle tier. It ranks above the BAC855 and below the BAC4000. Riders choose it as a power upgrade when the stock controller limits what the motor can actually deliver.

Key Features and Benefits

• Field oriented control (FOC) – sinusoidal control provides smooth torque across the whole rev range.
• Sensorless operation – rotor position is calculated mathematically, so Hall position sensors are not required.
• Adaptive sensorless start – the motor pulls away without a position sensor signal, which removes a common source of faults.
• Up to 120% of rated locked-rotor torque – short-term overload above the motor’s rated limit is permitted.
• Automatic tuning – the controller identifies the parameters of the connected motor on its own.
• 180 A continuous, 200 A peak – power headroom aimed at the most demanding commercial e-bike and e-motorcycle builds.
• Wide 36-72 V voltage range – suits many different battery configurations from 36 V up to 72 V.
• IP65 rating, IP67 with sealed connectors – the housing is prepared for off-road conditions.
• TTL and Bluetooth communication – parameters can be read over a cable or wirelessly.

Who Is This Controller For?

Most buyers fit the ASI BAC2000 as a power upgrade for the Sur-Ron Light Bee and the Talaria Sting. Both platforms use brushless PMSM motors, which suits the sensorless FOC approach of this inverter. As a result, tuning workshops and e-moto builders specify it regularly.

Beyond those two models, the controller also serves high-power electric bicycles and electric scooters. The requirements are straightforward: a brushless PMSM motor and a battery pack somewhere between 36 V and 72 V. The unit targets the top commercial tier of electric bicycles, where factory controllers simply run out of current.

Please note what this product is not. It is not a motor, a battery or a charger. Instead, it is a drivetrain electronics component that controls the motor you already own. In addition, you need an ASI BAC2000 wiring harness before installation, and that harness is sold separately.

Technical Specifications

Why Choose the ASI BAC2000

ASI (Accelerated Systems Inc.) is a Canadian manufacturer based in Waterloo, Ontario. The company focuses on brushless motor controllers rather than a broad catalogue of unrelated parts. That specialisation shows in the electronics.

Every unit passes a 100% end-of-line test under load before it leaves the factory. Consequently, you receive a controller that has already been proven against a real electrical load. The IP65 housing, which reaches IP67 with sealed connectors, then keeps water and dust away from that electronics package during trail use.

Configuration happens through ASI BACDoor software. You can connect over TTL or Bluetooth, read the current parameters and adjust the setup for your motor. Auto-tuning shortens that process further, since the controller measures the connected motor itself.

Frequently Asked Questions

Will the ASI BAC2000 fit my Sur-Ron Light Bee?

• Yes. The controller is intended for the Sur-Ron Light Bee and its brushless PMSM motor.
• Your battery must fall within the 36-72 V window.
• The ASI BAC2000 wiring harness is required and sold separately.

Does it work with the Talaria Sting?

• Yes. The Talaria Sting is one of the two main platforms this controller was selected for.
• It also suits similar brushless PMSM motors on comparable e-motorcycles.

Do I need Hall position sensors?

• No. Rotor position is calculated mathematically by the sensorless algorithm.
• Adaptive sensorless start moves the motor without any position sensor signal.
• This removes a frequent point of failure in off-road builds.

How much current does the controller deliver?

• 180 A rated current for continuous operation.
• 200 A maximum peak current for short bursts.
• Overload reaches up to 120% of rated locked-rotor torque.

Is the wiring harness included?

• No. The ASI BAC2000 wiring harness is sold separately.
• Please order it before you begin the installation.

How do I configure the controller?

• Use ASI BACDoor software over TTL or Bluetooth.
• Auto-tuning identifies the parameters of your connected motor.

How does the BAC2000 compare to other ASI controllers?

• It sits above the BAC855 in the ASI BAC series.
• It sits below the BAC4000 in output.

Is it protected against water and dust?

• The housing carries an IP65 rating.
• IP67 is achieved when sealed connectors are used.

The ASI BAC2000 gives Sur-Ron and Talaria builds a sensorless FOC inverter with 180 A of continuous current and a compact, sealed housing. Remember to add the wiring harness to your order, since installation depends on it.