Otis Singleton
Electric bikes have become increasingly popular in recent years due to their environmental benefits and ease of use. Converting a traditional bicycle into an electric bike is a great way to save money and give your old bike a new lease of life. The process involves adding an electric motor, battery pack, controller, and other components to the existing bicycle. There are various electric bike conversion kits available on the market that provide an electric boost to traditional bikes, such as the Swytch Kit, which is known for its lightweight, easy installation, and powerful performance. Before beginning the conversion process, it is important to have a solid understanding of the fundamentals and ensure that your bicycle is in good working condition.
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What You'll Learn
Understanding the fundamentals of electric bicycle conversion
Electric bicycles have gained popularity in recent years due to their environmental benefits and ease of use. Converting a traditional bicycle to an electric one is a rewarding DIY project that requires some essential components and basic equipment. Before starting the conversion process, it is crucial to have a good understanding of the fundamentals involved.
The process of converting a bicycle to an electric bicycle primarily involves adding an electric motor, a battery pack, a controller, and other components to the existing bicycle. The electric motor is a crucial component that provides propulsion to the bicycle. There are two common types of electric motors: hub motors and mid-drive motors. Hub motors are integrated into the hub of the bicycle wheel, providing direct drive. On the other hand, mid-drive motors are mounted near the bottom bracket of the bicycle frame and drive the chain or belt to propel the rear wheel.
The battery pack is another essential component in the conversion process. It consists of lithium-ion cells that provide power to the electric motor and other components. The controller is an electronic device that regulates the power output from the battery to the motor, allowing control over speed, torque, and other performance parameters. Additionally, a throttle or pedal assist sensor may be included to modulate the power output and control acceleration and deceleration.
Before installing the electronic components, it is important to ensure that the bicycle is in good working condition. This involves removing any accessories that may hinder the conversion process, such as baskets or water bottle cages. It is also crucial to choose the appropriate motor size for the bicycle frame. Conversion-specific components, such as motor brackets, wiring harnesses, and mounting hardware, may also be required.
Converting a bicycle to an electric bicycle can be a complex process, and it is important to have the necessary tools and mechanical aptitude. Reputable conversion kit retailers often provide online resources and manuals to guide users through the conversion process. It is also essential to research the legal requirements and regulations for e-bikes in your region, as they may vary.
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Choosing the right conversion kit
Electric bike conversion kits are a great way to give your traditional bike an electric boost without the cost of a full e-bike. There are a few things to consider when choosing the right conversion kit for your needs.
Firstly, it is important to familiarize yourself with the laws regarding e-bikes in your region. Power output, throttle assist, and maximum speed may be regulated by law, and these restrictions can turn your bicycle into a legally classified motorcycle. For example, in the UK, electric bikes are not permitted to have a power output of more than 250W and should not propel the bike when it is travelling more than 15.5 mph.
Secondly, consider your personal requirements and range or journey needs. If you live in a hilly area, you may require a conversion kit with more top-end power. The type of brakes you have is another important consideration. Disc brakes will provide far better braking performance than other types, which is crucial as the extra weight and speed of an electric bike will put more stress on the brakes.
Thirdly, ensure that the conversion kit is compatible with your bike. Check that the wheel sizes match, and if you have a disc brake, confirm that it is compatible with the kit.
Lastly, choose a reputable brand that offers support and has good reviews. There are thousands of electric bike conversion kits on the market, so it is important to select one that is safe and compliant with the laws in your territory. Some reputable brands include Bafang, Swytch, TongSheng, Voilamart, and Skarper DiscDrive.
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Installing a motor
When installing a hub motor, the first step is to remove the rear wheel. This involves loosening the brake cable and the wheel's quick-release lever, and then lifting the wheel while holding down the rear derailleur. Once the wheel is removed, you can transfer the tube, tire, and freewheel to the new wheel. It is important to deflate the tire before removing it and to use appropriate tools, such as tire levers, to ensure a safe and efficient process. After installing the new wheel, make sure to adjust the brake cable and wheel alignment for a smooth riding experience.
Mid-drive motors, such as the popular Bafang systems, replace the crankset and usually have a single chainring. They connect to the bottom bracket and spin the front chainring directly, which then drives the chain and rear gears. This provides electric power assistance to your pedalling. Before installing a mid-drive motor, ensure your bicycle's bottom bracket is compatible, and clean the inside of the bracket slot. Once installed, check the shifting and adjust it as needed using a comprehensive tutorial as a guide.
Regardless of the motor type, it is crucial to securely connect and insulate all wire connections using electrical tape and zip ties. Most kits include pedal-assist sensors or crank arm sensors that activate the motor. Install these sensors according to the kit instructions, ensuring proper alignment with the magnet on the disk. Additionally, consider installing brake sensors that automatically cut power to the motor when brakes are applied, enhancing safety and rider control.
After installing the motor and sensors, it is important to adjust the motor's settings to comply with local laws and personal preferences. You can use a USB programming cable or a Bluetooth adapter to connect to a Windows PC or an Android app, respectively. This allows you to adjust parameters such as maximum speed, acceleration, and regenerative braking, ensuring a smooth and enjoyable riding experience.
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Adding a battery pack
Planning the Battery Pack
First, you need to determine the desired voltage and capacity of your battery pack. Most electric bicycle batteries fall within the 24V to 48V range, with 12V increments. For example, to achieve a 36V battery, you would need to connect ten 3.6V or 3.7V lithium-ion 18650 cells in series, resulting in a "10S pack".
Preparing the Connectors
Before assembling the battery pack, it is recommended to prepare the connectors to minimise the risk of accidentally shorting the pack. For the charging connector, you can use RCA connectors, with a female connector on the battery and a male connector on the charger. Solder the connectors securely and insulate them with heat shrink tubing to prevent short circuits.
Assembling the Battery Cells
To achieve your desired voltage, connect the required number of 18650 cells in series. Additionally, wire multiple cells in parallel to reach your desired pack capacity. Ensure that the cells are securely connected and insulated to prevent any potential hazards.
Protecting the Battery Pack
To protect the battery pack from damage and vibrations, it is advisable to wrap it with a layer of foam, such as 2mm thick craft foam. Cut the foam slightly larger than the pack, wrap it around, and secure it with electrical tape. Then, apply heat shrink tubing over the foam layer. Measure the perimeter of the pack to determine the appropriate size of heat shrink tubing, which will typically shrink to about 50% of its original diameter and 10% of its length.
Mounting the Battery Pack
Battery packs can be mounted in various locations on your bicycle frame. Common options include bolting the pack to the frame, attaching it to the handlebars, or mounting it on a rear rack. Consider the available space and the ease of access when deciding on the mounting location.
Safety Considerations
Always exercise extreme caution when working with lithium batteries, as they contain a significant amount of energy. Ensure that you have a basic understanding of battery principles and electrical and technical skills before attempting to build or modify a battery pack. Additionally, pay attention to local laws and regulations regarding electric bicycles, as they may vary depending on your region.
By carefully following these steps and instructions, you can successfully add a battery pack to your bicycle, taking you one step closer to converting it into an electric bicycle. Remember to seek professional assistance if needed and always prioritise safety during the assembly process.
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$259.5
Connecting the controller
The controller is one of the most important parts of an electric bicycle, acting as the brain of the e-bike and regulating the power output from the battery to the motor, controlling the speed, torque, and other performance parameters. The controller is connected to all the other electronic parts, such as the battery, motor, and the throttle.
Before connecting the controller, ensure that you have the necessary tools and materials. The controller is generally installed on the frame, under the seat, or next to the battery box. Find the installation location and fix the controller to the frame firmly to ensure that it does not loosen during rides. Some frames will have special fixing slots, but if there is no fixed location, use cable ties to secure the controller tightly.
Now, let's move on to connecting the wires. The battery wires are usually the two thickest wires on the controller, typically divided into red (positive) and black (negative). Pay close attention to polarity when connecting these wires, as incorrect connections can lead to short circuits or damage to the controller and battery.
The motor wires of the controller and the electric bicycle should be connected according to their colours. Thick wires are usually marked with yellow, blue, and green, corresponding to the three-phase wiring of the motor. Thin wires, on the other hand, may be yellow, blue, green, red, or black, corresponding to the Hall sensor. Ensure that the colours of the thick and thin motor wires match to avoid motor vibration or abnormal operation caused by signal mismatch.
The throttle cable typically has three or five wires, with colours like red, black, and green or blue. The red wire represents power, the black wire is the ground wire, and the green or blue wire is the signal wire. Connect the red power wire to the corresponding red port on the controller.
Additionally, if your electric bicycle has a pedal assist system (PAS) or a light system, the controller will usually have a designated interface. The PAS line typically consists of three lines: red, black, and blue. Connect the red wire to the power supply, the black wire to the ground, and the blue wire as the signal line. If your controller has a light control interface, refer to the instructions in the manual to connect the positive and negative poles of the controller and the light.
Finally, after completing all the connection steps, test the various functions of the electric bicycle to ensure everything is working properly.
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Frequently asked questions
The basic components required are an electric motor, a battery pack, a controller, and a throttle or pedal assist sensor.
Some popular electric bike conversion kits are the Swytch Kit, TongSheng kit, Voilamart kit, and Skarper DiscDrive.
Converting a bicycle to an electric bicycle can increase the distance possible with commuter bikes and can be a more sustainable option than buying a new electric bicycle.
It is important to have a solid understanding of electric bicycle conversion fundamentals and to ensure that your bicycle is in good working condition, especially the brakes, tires, and frame integrity.
Specific steps may vary depending on the kit and bicycle model, but some common steps include removing any accessories that may hinder the conversion, disassembling the front wheel, installing the motor wheel, and connecting the motor cable to the controller.
