Review on ✅ DROK 091013 LM2596 DC Buck Voltage Regulator - 36V to 24V, 12V, 5V, 3.3V, 3V Converters, Constant Voltage and Constant Amp Output - 5-36V to 1.25-32V, 5A, 75W by Roger Weinmunson

Seems to work. I needed a variable voltage regulator for use in an off-grid solar charging system for different battery voltages. The two 12 volt deep cycle batteries in the caravan needed 14 volts to keep them charged, but I also needed to charge 6 volt batteries for game cameras, as well as USB power for computing devices, GPS and cell phone devices. Phone. The digital display allows you to set the voltage with sufficient accuracy. The adjustment is made with a small screwdriver. I installed the board in a plastic fridge freezer tray with a latch to protect it from moisture and I can remove the lid for ventilation while charging. It's pretty much a standalone thing as the instructions are almost useless. However, emails from DROK were answered promptly. They seem to support their product. Mounted in its own weatherproof case with adjustment knobs would be ideal, but I found it an inexpensive way to test out some ideas without having to upgrade to a more expensive configuration. So far I've been happy with the results.