A stable power supply is crucial when coding a BMW. Voltage fluctuations can interrupt the process and potentially damage sensitive modules. This article details a DIY Battery Stabilizer built using an HP server power supply, specifically designed for the power demands of BMW coding. This setup provides a consistent voltage, preventing coding interruptions.
HP Server Power Supply as a Foundation
The chosen HP server power supply consistently delivers 20 amps and can peak at 40 amps immediately after being switched on. This high output makes it suitable for the demanding power requirements of BMWs, especially models like the E70, which tend to draw more current than the E90. Testing confirms the stabilizer can maintain a stable output for extended coding sessions, handling up to 60 amps at 110V. Using a 220V input could potentially increase the capacity to 80 amps.
Important Distinction: Stabilizer vs. Charger
It’s critical to understand that this voltage stabilizer is not a battery charger. It provides a constant voltage output without the necessary monitoring to prevent overcharging. Connect this device only during coding sessions. Battery chargers include sophisticated monitoring circuits to shut off once the battery is fully charged, a feature absent in this stabilizer. Leaving it connected for extended periods could severely damage the vehicle’s battery.
DIY Challenges and Considerations
Building this battery stabilizer requires significant DIY skills, particularly soldering and electrical knowledge. The 14V modification necessitates advanced expertise. Adding a voltage meter further complicates the build due to limited space and the need for high-ampacity battery cable connectors.
The construction incorporates 4-gauge wiring for the main power connection, and the output utilizes six 12-gauge wires from the supply to handle the high current demands efficiently.
3D Printing the Enclosure
The enclosure for this project was 3D printed using ABS plastic for durability and high-temperature resistance. Printing the larger components can take eight hours or more. Alternative materials like PTEG might be preferable for faster printing and reduced odor. However, ABS is suitable for hot environments, preventing melting or deformation. Using PLA plastic is not recommended for enclosures exposed to high temperatures.
Conclusion: A Powerful Solution, But Not for the Faint of Heart
This DIY battery stabilizer offers a robust solution for maintaining stable voltage during BMW coding. However, it’s a complex project requiring advanced DIY skills and electrical knowledge. The construction involves careful wiring, soldering, and 3D printing. While commercially available options might be simpler, this DIY approach provides a powerful and customizable solution for experienced enthusiasts. Remember, this device is for coding use only and should never be used as a battery charger.
