Solar Controller

thingiverse

A smaller version is available here: https://www.thingiverse.com/thing:2357657 Update: I have extended the sides where the LM2596 chip resides. YouTube: https://youtu.be/wc3J8u5KAgE This solar controller converts an 18v or 20v solar panel input to a 12v output using the LM2596 DC-DC step-down. I designed this for a Raspberry PI 3 with a 7-inch monitor to run on strictly solar power, but it can also be used with other devices. LM2596 adjustment tutorial: https://youtu.be/s7_B0LqUKuM LM2596 specifications: Input voltage range: 3v - 40v Output voltage range: 1.5v - 35v Maximum output current: 3 amps Fan details: Dimensions: 50mm X 50mm X 11mm Voltage requirement: 12v Draws about 0.03-0.04 amps Push button specifications: Button rating: 3 amp I used a 30-watt solar panel at maximum daylight output to adjust the LM2596. I set the chip from 19v to 12.6 volts. Note that different solar panels may produce varying voltage outputs, so adjustments should be made accordingly. Remember to keep the output current below the 3-amp limit to avoid overheating the chip. A 3D pen was used to reinforce the plug and secure the LM2596 in place. If needed, a hot air gun can be used for removal. I designed a case that can handle up to 15 amps: https://www.thingiverse.com/thing:2357678