HOMELYLIFEVoltage Converter DC 8V-40V to 13.8V 10A 138W Automatic Buck Boost Step Down Up Reducer Waterproof Module Transformer for Golf Cart Club Car

I bought this to step down a battery that was rated at 12v but was actually delivering 18v. I wanted to power a telescope mount but not fry its electronics. Fortunately, I'm cautious enough to test the battery before just blindly hooking it up. With this in the circuit, the battery delivers a nice even 12v.

I want to step power up from 12v to 24 from either a LifePO4 battery or my vehicle to charge an ecoflow river faster. This works perfectly for this and I show 100-110W input power on the ecoflow. I was concerned about heat, and while it does get hot, it's not so hot that you can't touch it. Time will tell how durable it is, but I will likely order another for my truck.

Prompt shipping

I bought the 10A 13.8V output unit with a 8-40V input -There were several thing that weren't clear from questions or reviews - here's what I found with the one I received;Idle current with a 13.8V source and no load was 7mA or about 0.1W - roughly 0.18 Ah or 2.4 Wh per DAY for a 13.8V battery. For many applications this could be left on without serious battery drain (great for my application)The output was showing 13.8V on a typical multi-meter with no other "load" - so there is no apparent "Low Load" protection or turn off on this model - It operated an electronic thermostat module that draws 48mA (0.67W) without a problem.This was quoted to require a 35W load to "turn on" in one post and in another, it was asked if it could run a low current sensor - the unit I received absolutely CAN run a low current load (This is necessary for my use)Input wires are 14AWG and outputs are 16AWGI shorted the output - it shuts off and then tries to restart - cycling quite frequently - maybe 3x a second - after about 20 seconds, I removed the short and the unit still works perfectly. More resilient than expected.With a just a 10W load, the unit functioned down to 5V input (not recommended but did not immediately cut off at 8V) as the current rises rapidly at lower source voltage, I wouldn't try less than 8 V for a full load but the unit will run below that (possibly requiring a low voltage shutoff as it doesn't seem to have one internally).This was measured with the unit I received Oct/2022

Lasted 9 months and now has zero output. Only used for a few hours for two camping trips in the last 9 months powering Starlink in our RV.EDIT.....My mistake, was using the wrong multi meter setting, still working just fine!

I had to install two way radios for work. My 2013 2500 hd charged at 14.5 - 15.5 volts to high . After spending a couple thousand dollars to try to lower the voltage, only to discover finally that’s normal. I installed the 8/40 to 13.8 regulator my problem is solved. I’ll have to wait on longevity

Easy to install as long as you can read schematic diagram. It works great!

I bought this hoping it would maintain a constant voltage for my fuel injection.Finally installed, while cranking the engine, the voltage drops to 10 volts. Doest not supply a constant voltage. When you turn off the ignition, it stays hot for a few seconds.May work as a reduction device, but does not work for boost.