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

Troubleshooting electrical issues in my new to me used RV revealed no 12 volt power charging the house batteries when plugged in to shore power. Sure enough -- the old converter was shot. Looked online for replacements and found this Powermax converter at a reasonable price and in a form factor that would easily replace the dead converter. The 12 volt connections tighten down easily using a slot screwdriver. The previous converter used hex allen screws, which can be a pain if you have misplaced or lost the proper size wrench. No issues here--everybody has lots of screwdrivers--even neighbors! The two 30 amp safety fuses are easily accessible if you ever need to replace them--a nice touch. The converter is quiet and charges in three steps just like advertised (confirmed by my voltmeter). I bought the 55 amp model as my previous converter was also 55 amps. But, I would not hesitate to go for a higher amp model if I were to do this again.

I absolutely love this power converter. Easily powers my 1100 watt amp and pioneer head unit. The fan is hecca silent and only kicks on when needed. I completely recommend this product.

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.

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.

I watched many RV YouTube videos to research for a replacement for the converter for my RV after the factory one quit. I think this converter will maximize may deep cycle battery life because of the 3 stage charge rate.

Easy to install. Solved my dimming issues with the 12 volt system and undercharging of the battery. Was a replacement to the OEM WFCO unit that didn’t last a full year of usage.

OK gang, everything went smoothly until I went to shove the new converter in place of the original WFCO. The new Powermax didnt fit!! Specifically, the mounting tabs on either side of the new Powermax converter prevented the new unit from fitting in the WFCO housing.......so, out came the saber saw with metal blade and off came the mounting tabs. It was a tight fit but all is good now. Dont forget to calibrate the Powermax voltage per the manual and so far on startup this 3-stage converter works as advertised. By-the-way, I live full time in a 2018 Coleman 26 Lantern pull trailer and I plan to do more boondocking in the future so Ill be relying on the trailer batteries more often including an 81-watt solar panel and a Honda eu2000i generator. Cheers All!

Extremely well packaged! The PM3-55 arrived in perfect condition. Installation was easy (for lead acid battery there is no need to adjust) Super simple installation, my coach batteries were at 10.1v according to the Solar regulator, fired up the genny and the PM3 was immediately reading 14.64v output on my calibrated multi-meter and 13.1 on the solar regulator (reads @ the battery bank). Ill update as time goes on, my comparison will be against a 1992 vintage supply/charger so I am sure this unit will exceed my expectations.

It fit

My original was narrow vertical mount and a defunct company. I was able to have enough space to floor mount this near original area. It seems to be doing the intended job of keeping the coach batteries charged and the rest of the 12 volt system up proper level. The noise level of the cooling fan is quite minimal and actually an assurance that it is working. The 55 amp unit was considerably less expensive than other makes of same amp range. So time will tell if it is less expensive or cheap junk. Ive had it only a couple months; so far, so good. Id give it 5 stars if it would create its own power !!