Electrifying a go-kart: motor, controller, battery, and the pitfalls to avoid

A kart is one of the machines that benefits the most from switching to electric power: instant torque coming out of corners, no noise for residents near the track, no smell under the tents, and much simpler maintenance. However, a successful electric kart is not simply about replacing a combustion engine with an electric motor. This guide reviews each component and the common pitfalls we often encounter.

The motor and drivetrain

On a kart, the motor is mounted to the chassis and drives the rear axle via a chain, similar to a gasoline engine. Therefore, the pinion and sprocket are retained to adjust the gear ratio: a larger ratio provides more torque out of corners, while a smaller ratio provides more speed on straightaways. Electric motors typically rotate faster than gasoline kart engines, which often requires a higher gear ratio.

The motor must primarily be able to withstand heat during an entire session. In karting, you constantly accelerate and brake, and a motor that is not powerful enough will lose torque when it gets hot. See our guide on motor overheating.

The controller

The controller defines the character of the kart. It controls the throttle response, the motor braking when the throttle is released, and protects the motor and battery from overheating. On a kart, it must be mounted away from splashes and secured in a way that resists vibrations, with appropriate cooling. The electric motor braking can also recover some energy during braking: see our guide on regenerative braking.

The battery

The battery is the heaviest component. Its position is just as important as its weight: if it's too high, it lifts the inner wheel; if it's too far back or too far forward, it unbalances the kart. On a chassis without suspension, it must be securely mounted and protected from impacts. Its capacity is calculated based on the actual duration of the sessions, and its cells are determined by the current drawn during each acceleration: see our guide to read the technical specifications of a cell.

Safety

• A kill switch that is accessible to both the rider and the race officials.
• Protected, properly sized, and routed away from moving parts: see our guide on power cables and connectors.
• A battery with a Battery Management System (BMS) that shuts down in case of a fault.
• For a racetrack, the ability to slow down or stop a kart from the pit lane in the event of a yellow flag is crucial.

The case of rental go-karts

For a racing circuit, the fastest machine isn't the primary goal. What's needed is adjustable power to suit the rider, whether they are a child, a beginner, or an experienced user, batteries that last all day and whose charge level is always known, and a maintenance history for each kart. This is what we design for racing circuits and rental companies, with fleet management using RageLink.

For the general method, please refer to our guide on how to electrify a machine: where to start.