DROK DC-DC Stabilizer, 9V-36V to 12V Boost Buck Converter 5A 60W Waterproof Auto Step Up Down Voltage Regulator 12V Volt Transformer for Car Audio Solar Power System LCD Television LED Display Screen

Bought this August '24 to supply a stable voltage to a MaxxAir Deluxe fan in my motorhome which pulls a maximum of 4A. Worked great..........for about 3 weeks in the 10 months it was installed and used. Now there is no output.

Works OK .. would have been better if it had an in-line fuse as part of the product.

This DROK DC Stabilizer is one of 2 main fixes for the dreaded MaxxFan green light beep and failure. The MaxxFan is the Best and Worst RV fan in the industry. When working, it is without a doubt the best RV fan with the most air movement, quietest operation, and low amp draw of the various options out there. But it suffers from 2 manufacturing fatal flaws that have been well documented by many who have suffered the fan failure. The first flaw is the circuit board not being waterproof, and living below a vent cap that can allow outside water onto the board, or inside condensation to drip onto the board. The second flaw is the electronic components used that are extremely sensitive to voltages over 13 volts or so. This is problematic as many RVs see voltages up to 14 to 14.5 volts when receiving charge from a generator, a tow vehicle, or a solar system. So having read numerous accounts of fan failures, and methods to correct the problem, I went in search of a DC voltage regulator. This one received good reviews, was well priced, and was also used by other fixing the same issue with their own MaxxFans. I installed this voltage regulator after having to replace my failed circuit board, in the hope that this permanently solves one of the problems. I bench tested this unit before installing it, as shown in the photo, using a portable lithium battery that provided 13.3 volts output. This Autoutlet regulator held the through voltage to a constant 12.2 volts. After installation, I again tested it once connected to my RV 12 volt system, which on shore power with the battery charger active was showing over 13 volts. This regulator did a great job of holding it to 12.2 volts installed. To protect the circuit board from problem #1 (moisture) I also coated top and bottom with thin coat of GE Silicone Supreme (neutral curing silicone sealant). I'm hoping these two remedies will keep my MaxxFan operating for many more years to come, hopefully with no more flashing-green-lights-of-death. I can't speak to longevity of this voltage regulator yet as it's only been in for a few months of operation, but so far it has helped the fan work flawlessly, thru all 10 speeds, in forward and reverse, as it is meant to operate. If you're looking for a reliable Voltage regulation option, I can highly recommend this Autoutlet device and the company selling it. Check out the attached photos for visuals of how I mounted it, using hot melt glue, into the outer frame of the fan. This caused no problems with clearance even in the low profile roof of our little Coachmen Apex Nano trailer.

Another maxxfan amateur repair tech here! Was getting 15.2v from shore power and fan was not having it. Sent info to manufacturer and they suggested a volt reg like this one. Asked for a brand recommendation and they haven’t responded. This was easy peasy on installation. 12.2v from both shore and house. I am concerned about longevity as mentioned in so many other reviews but I guess that remains to be seen. For now I can say this was as simple a fix as I’ve had in quite some time. Almost makes you wonder why the maxxfan people don’t just put one of these in at time of build.

Same story as others, bought for maxxair fan fix. 14V going in, less than 1V coming out. Waste of plastic.

Bought this to stabilise the voltage for a bougerv fridge that shuts down about 10.5v worked for a couple outings, then this year on the water all my accessories dead. 5A fuse dead, so out in new one. That does next trip out but I brought fuses, amd put in a 7.5A. that blew. Today put a new 7.5A in and an hour into the boat ride all accessories die again, but I can smell something really burning electrical, so I shut down the entire circuit. We'll get back and pull the dash apart, and this thing has two giant bubbles on it it has melted so bad. The only thing running off this was the plug in portable fridge. The fridge at max is 3-5A, but when cycling is 1.5A-2A. when the fridge was directly on the access circuit, it never blew the 5A fuse even with a garmin 9" color fish finder, stereo..etc... it would just shut itself down when voltage dropped too low if engine off. So obviously the draw was under 5A. Lucky this thing didn't catch fire.