SUPERNIGHTDC Automatic Buck Boost Converter DC 8V-40V to 13.8V 10A Step Down Up Voltage Regulator Waterproof Voltage Reducer for Golf Cart Club Car LED Strip Light

I use this with a fused cig lighter plug to feed 24-28v to a little tpa3116-based monoblock amp driving 8 4x6 sealed soundbar subwoofers in my car. I had the amp and the little subs so it was the cheapest way to fill in the bass a bit. As an aside despite the max output limitations (~87db/1w before cabin gain with roughly 60 watts on tap) its sound quality is on par with the SI and TC-sounds/Morel/DSP installs I've done for clients in the past. Seriously. No one-note boomy bass, just smooth articulated fill.Works great, doesn't get warm in my application (it's pretty cold around here so YMMV with heavy loads in a hot climate, but the case remains ambient) and hasn't skipped a beat. Not much to review, but worth noting that if you use it for a similar audio application involving fragile or high frequency transducers you may want to add a simple high pass filter on the amp outputs for the initial surge when turning the car on. In my application this minor thud noise doesn't matter, but anything close to dc can bypass crossover non-polarized capacitors and pop your tweeter.

Perfect

Not good don't buy this,,

I used this voltage converter to go from 20v DC Dewalt batteries to 48 volts for a PoE switch. I then use the PoE switch to power 4 Raspberry pi nodes. It supply enough power to run 4 devices plus the switch. It runs cool at around 60-80 watts draw. The wire is very good with many strands and a good amount of copper. It was very easy to solder the the leads to a battery adapter.HighsGood valueRuns coolProduces a clean 48 volts DCStrong epoxy holding wiresWiring diagram on the back of the device!

used to adapt my spare Dewalt 20 volt into a 13.8 power supply