Powermax 110 Volt to 12 Volt DC Power Supply Converter Charger for Rv Pm3-55 (55 Amp)

Got our power supply in 3 days. Just what was needed.

I work for Mercedes Benz and their equivalent cost 1,000$ from midtronics. This does the same thing for under 200$!!!

I ordered this converter to replace the giant OEM converter that was sucking our house batteries dry in our 1986 Foretravel Grand Villa Barn Find restoration project. The install was straightforward and simple. I have watched the converter for about a week now and it is keeping the batteries very stable and functional. I have attached a picture to show the compartment that will be an Auxiliary electronics bay. Eventually this will mounted on an aluminum slide out tray for servicing or additional wiring. Although the old converter was a 75 Amp converter, I seriously doubt that the old converter would push the 75 amps, so in this instance, I opted for the 55 Amp model. Under full load, the Powermax is more that adequate. Also the fan noise is about 80 decibels less that the original. Its fan is temperature controlled and is not much more than a whisper when on. the old converter sounded like a box fan from the minute it went on shore power and ran constantly. My thought is: If you are looking to replace your old battery burning converter, look no farther. The Powermax converters are dependable, quiet and will do the job you need quite admirably.

I got this to replace my cheap supposedly 3 stage converter that only charged at 13.6V no matter what. This converter works as expected, 14.6 when batteries are low, 13.6 when filling up and 13.1 float. When the fan runs its not silent but not the loudest thing Ive heard either. Im sure this will help me recharge faster when I am boondocking on generator.

Needed it for our travel trailer, as soon as it was installed everything worked the way there supposed to.

Although this product lasted me about four years, can anyone explain how it burned up these two 40 amp fuses all of the sudden out of the blue? It operated flawlessly all this time and then the fuses actually melted and also melted the fuse sockets. At the time of failure it was powered with a 1,600 watt Predator generator - that has also ran many many hours flawlessly before and after these fuses burned up. Since the fuse sockets melted I am not going to replace the fuses just to see what might happen. Thoughts?

I am using the inverter to charge 2 deep cycle batteries for use in a small cabin in the woods. The cabin utilities rv 12vdc appliances, water heater, water pump, refrigerator, furnace, exhaust fan, usb outlets and lighting. The 2 batteries deplete to about 40% in 24hrs and using generator 110vac power, the inverter will fully recharge the batteries in about 2-3hrs. The inverter puts out very little heat and the fan only runs periodically for a minute and then shuts off. The inverter makes no sounds except while the fan is running. The only downside is the green green light which indicates the inverter is powered by AC voltage. Its fairly bright.

The grill over the fan was bent in against the fan. I pulled it out and it works .

You loosen 3 screws on the old one and unplug it. Put the wires back just like you took them out and plug it in. DONE 10 mins. I was a bit surprised that the exact brand and part number that I replaced 2+ years ago had already died. Im giving the same brand another chance. Its says RV so open your wallet.

Wired it up in an RV, fired right up and working fine, fan only runs every now and then, unit isnt hot to the touch at all even under load. Checked the voltage and it was doing everything right. Its a hair wider than the replacement unit but nothing a little trimming here and there off the ugly brown electrical box cover wont take care of. Charged up the 2 big batteries I have and idles without the fan charging and running all the dumb crap in the RV, Im going to leave it on in the heat and see how it does, other than that it seems robust enough to get the job done. Update, I left it running doing its thing for weeks, sometimes with ac sometimes without. It dealt with the summer heat inside the RV just fine, the inside temperatures sometimes climbing into the 118 range and it just ramped up the fan more often and took care of business. Update 2: still handling the 24 hours a day of being ravaged by the various 12 volt accessories I have running in the RV, I even hook random car batteries to the system to charge them up and it takes care of it, with the minor amount of air circulation the poor unit gets its holding up the the tortures of being in my vicinity. For anyone that has had a unit blow out I would suggest they invest in a high quality surge protector for their RV or to plug the one they are using inside the house or shop into a decent surge protector, if not, its all you when it gets smoked. Update: bought June 2019 and its now Feb 2020, power supply still runs perfectly and have had no damning issues at all, definitely a very strong and well made unit. If it can survive me and all the dumb things I do its definitely a must buy. I will update again at one year with the final conclusion. UPDATE: July 2020, unit is still running strong and no signs of wear after two summers of heat and 24 hours a day use, charged a few car batteries with it since then also and it ate it like a pro, definitely a good purchase and if it blew out today I would order another, definitely did its moneys worth of work. Update: mar/2021: still trying to kill it, the bad boy survived covid, a snowpocalypse, a wore out battery, 24 hours a day use continuously since the original purchase and its still going. I still hook batteries up to it to charge them every now and then also and it eats it like a barbarian. It even survived an A/C failure and it chugged along doing its job in 110 degree heat for a day with shoddy ventilation, I am going to buy another for the workbench just because. Last update: 26 oct 2021: I cant kill it.