We’ve featured a number of different concept and production electric bikes here on Geeky Gadgets, but this electric DIY mod by Jennifer Holt is fantastic.
Using a 48v motor powered by a homemade battery pack made up of 144 x 3.3v lithium-ion cells, Jennifer has created a truly remarkable electric mountain bike.
Innovative Design and Engineering
This is the second version Jennifer has created and has limited this one to 30mph by design. The low gearing and large motor lead to insane torque, Jennifer says.
“I had to set the current limit in the Alltrax controller to half its max value, otherwise it was impossible to keep the front wheel on the ground. As it is, you still have to be careful taking off, it will throw you over backward if you peg the throttle from a standstill. Acceleration is limited by the friction between the rear wheel and the ground, you can lean forward to keep the front down, but the reduced load on the rear means that the drive wheel will slip, even on dry pavement.”
Jennifer’s approach to building this electric bike showcases her deep understanding of both mechanical and electrical engineering. The homemade battery pack, consisting of 144 lithium-ion cells, is a testament to her dedication and technical prowess. Each cell is meticulously arranged to ensure optimal performance and safety. The Alltrax controller, a crucial component in managing the power output, is finely tuned to balance performance and control, preventing the bike from becoming unmanageable.
Challenges and Future Plans
Sounds brilliant, but unfortunately, Jennifer has already totaled this bike and broke her elbow in the process. (Get well soon) She has already started rebuilding a new version and hopes to release CAD drawings for the custom components.
The accident highlights the inherent risks involved in high-performance electric bikes, especially those with significant torque and acceleration capabilities. Safety measures, such as proper protective gear and cautious riding practices, are essential to prevent injuries. Jennifer’s experience serves as a reminder of the importance of balancing innovation with safety.
Despite the setback, Jennifer’s determination remains unwavering. She is already working on a new version of her electric mountain bike, incorporating lessons learned from her previous builds. The release of CAD drawings for the custom components will be a valuable resource for other DIY enthusiasts looking to build their own electric bikes. These detailed plans will provide insights into the design and construction process, making it easier for others to replicate and improve upon her work.
Jennifer’s project also opens up discussions about the future of electric bikes. As battery technology continues to advance, we can expect to see even more powerful and efficient electric bikes on the market. DIY projects like Jennifer’s push the boundaries of what’s possible, inspiring others to explore new ideas and innovations in the field of electric transportation.
In conclusion, Jennifer Holt’s electric DIY mod is a remarkable achievement that showcases the potential of homemade electric bikes. Her innovative design, technical expertise, and determination to overcome challenges make her a standout figure in the DIY electric bike community. We look forward to seeing her future creations and the impact they will have on the world of electric transportation.
Via Ubergizmo
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