Review on DC 24v to DC 12v Step Down Converter - 10A 120W Truck Car Power Supply Adapter - Ideal for Auto, Truck, Vehicle, Boat, Solar System and More (DC15-40V Inputs) by Scott Matute

this little one works and doesn't get hot or even hot to me. I use an 18v Ryobi battery to power the buck converter and then it outputs to a 12v cigarette socket to which I connected a Bestek 300w sine wave inverter which is now charge my computer. I can draw about 150W (120 volts). ) from a 4 amp/hour battery, without rapid battery drain. I would buy another in a heartbeat if I had to build another device.