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

Super cool!!! Easy to hook up, great quality and charging my Lance cab over battery like a champ at 14.6 Volts. The Parallax power unit I had running my Rig burned out for the forth time since 1997 mind you, but I’m not spending the time or money for one of those again. So I bought this unit and relocated it to under my sink for better air flow and easy to replace if this unit ever goes out. Have size 8 AGW wire on hand because that what this unit requires and what size wire that should be used.

Finally got this Converter installed. It is working perfectly in my camper. Has three phases of power generation, from quick charge to steady system 12 volt to trickle charge. Used original converter chassis so the Power max slipped right back in the panel. Did have to drill some cooling holes. The original unit is no longer made, so, any converter would have required work. The PowerMax is the easiest to convert to my rig! Working Fantastic so far!

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.

Just Doesnt charge very fast or well it seems. Pretty disappointing.

I’ve used this for a couple months now and this was very easy to use and setup!

Use it to replace a 30amp unit

Researched the options, and this fit the bill for the OEM charger in my trailer. Works great since then, been running for nearly a year, keeping the house battery topped. I did have to modify the the housing this fits into on the trailer since its a little deeper than the original. Otherwise, hookup with new wire was easy.

Not 5 stars only because I just got the unit today and confirmed that its working. My application required replacing a shot Atwood APS 5530 converter. I simply disconnected that unit and left it in place, and hooked the Powermax up the same way using 6AWG wire: Powermax positive output to the Converter + input on my Atwood fuse board. Powermax negative output to the grounding block on the back of my panel. Plugged into the same outlet as my microwave. Removed the 40A reverse battery fuses on the board since the Powermax is fused. Voltage tested at 14.7 at the unit and the converter input on the fuse board. Dropped to 13.6 after a few minutes, unit was warming up but no fan running. Voltage at the battery + on the fuse board reads 12.5. Good enough for me ... Ill hope this lasts a few years or more and keeps my batteries in good shape. I plan to mount on the wall next to the microwave which offers plenty of front/rear breathing room for the fan. No way to mount it in the same space as the panel.

Install was easy. Mounting holes were same spacing but 1/2” wider then old one. No biggie. You do hear the fan kick on and off if all is quiet in motor home. (But how often is that). The fan should allow for longevity. I like the constant even voltage, and keeping my batteries charged. It does still work if battery is removed.