Large Power Bank

thingiverse

Large, but highly portable power bank designed to thrive in camping environments where access to electrical grids is scarce. Built with versatility in mind, the internal components can be easily replaced to suit various needs. For this build, I opted for: * 2 buck converters that reduce the voltage to 5.3V (each capable of handling up to 4 amps) * 1 buck converter that brings down the voltage to 12.6v (also with a capacity of up to 4 amps) * A BMS board designed for 5S configurations * Input lines for charging devices at 21V * 5 USB ports for delivering power at 5V * A voltmeter for precise readings * An on/off switch for seamless control * An output line for 12V (configured to accommodate standard 12V devices, but the buck converter can be adjusted for higher voltage outputs to charge laptops) The battery setup consists of 15 parallel-connected lithium-ion cells in a 5S configuration. Given that I utilized recycled laptop batteries, the total capacity amounts to approximately 530Wh. This figure could be significantly improved by incorporating high-quality brand new batteries. The device's sides were crafted using 3D printing technology, while the top and bottom components can also be produced via this method if a large print bed is available. However, I decided to cut mine from a 1mm stainless steel sheet utilizing plasma CNC for enhanced rigidity and better heat dissipation. Alternative materials like laser-cut or milled aluminum for the top and bottom cover would offer similar benefits.