OONOLow Loss PWRshield LVD-HVD Power Guard Module, PWRguard

works perfect to protect ham radios from over voltage

This should be on any battery/power supply/radio type hook up for protection ... Works great ... I does not, however come with Anderson PowerPole connectors as advertised ... Otherwise, nice offering ...

The product works as stated. I did several tests of the unit. For its purpose to protect batteries from over draining it will shut off at the voltage stated and at room temperature the cutoff was quite accurate on low shutoff, turn back on and the same on the high shut off.The on is on and off is off, both are good options to have so that if you need to use below voltage then you can, but it would also allow high potentially damaging voltage through too. Having an off switch is always a good idea.What I did find was that on low cut off it took 5.8 seconds to disconnect so quick dips do not shut off the output. For example if you are using a ham radio and the current pull causes the battery voltage to drop below 11V for fractions of a second at a time it will not shut off. The same is true for turn on voltage it has a delay of about 5.8 seconds after crossing the enable voltage. That is likely fine so again if using a ham radio and you are protecting your car battery from too much drain it will shut off as it slowly depletes and then not turn back on until after you crank the vehicle and it runs for a few seconds. Likely a good design for this.On the high shutoff, it works well and reasonably quickly. If the voltage is too high at power on then only about 0.5V passes through to the load (I did not have a real load only high impedance in my test so it may allow less if there is real current draw). I want to do some more testing if say you were using a ham radio and the voltage went from 13.8 to 15V how much would pass before it shut off.Quality of the enclosure is good. Quality of the circuit design and soldering is lackluster, no PCB cleanup after soldering, lots of splatter or flux and less than ideal solder joints in many locations, but nothing to prevent it from working.Product came with good instructions, extra parts for like DIN rail mounting and extra PowerPoles and boots for making cables. The only comment about the included paperwork is the flowchart (also was shown on the order page) was printed in black and white and the text of most of the blocks was not readable.The reason I did not give it 5 stars is because of the documentation not being readable and that the long delay in shutoff on under voltage or lack of ability to set it.Initially I believe I will be very happy with my intended purpose.

Works great so far!! I bought it for in my amateur radio emergency go-box and haven’t taken it out in the field to really test it yet . But all my tests so far show it’s working great!!

Worked great!