Cocar 12T12-4A Car DC 12V 4A Voltage Stabilizer Surge Protector Power Supply Regulator for Auto Truck Vehicle Boat Solar System etc.(DC10-36V Input, DC12V Output)

Very simple to fit and works as intended.

Simple and does the job! Ended up buying more than one to regulate the charging/float voltage in my campervan to 12v for voltage sensitive accessories.

We wanted to have an Amazon Echo Show in our Motorhome and although it is a 12v device, many domestic 12v units don't live long on vehicle 12v which can often be as high as 14.4v with the odd spike. The Show may have regulating chips inside but rather than risk it being destroyed we bought this stabilised supply. The output was connected to an Amazon 5m extension cable and the mains supply dispensed with. It has been working well for a Week or more so no reason to suppose it won't continue. The reason for the four stars was that although the heat sink casing is heavy duty the two mounting holes are too far inboard. The holes will accept M5 screws but they are so close to the body that the heads jam long before they reach the flange. The only solution I found was to cut the sides of the holes out to create 'forks' which allowed M5 screws to just grip the flange.

Bought it to let us run our TP-Link router directly from the leisure batteries instead of running the inverter to produce 240vac and then dropping it right back to 12vdc with the router wall wart. Connected 12vdc from the batteries to the input and cut and spliced the router power cable to the output. Just make sure you have the polarity right! Working fine after several weeks.

This product is small and quite robust. I have used it for powering my WiFi router and modem on my boat. Both units have performed well using this device

Although the output was 12volts wasnt rectified so when ignition on voltage was unstable,

Simple, easy to understand wiring and installation. Does the job in running our 12v Huawei router straight off the narrowboat's domestic battery bank.

Maybe i was unlucky, but mine stopped working after 10 mins of use. I was using it between a car battery and an inverter to make sure the inverter is never overloaded (as it has done before when my solar panel is charging the car battery and it becomes full. Then the voltage can go higher and i needed this kind of stabiliser unit to solve that)