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

So easy to install. Works like a dream. Replaced the piece of junk that my rv came with, and could not be happier. No more dim lights

Dont pay extra for faster shipping, it will not make it on that date. It came on the regular date if I had not payed more. Product is working great thou, install was easy.

Works like a Champ on our RV

Before purchasing I read reviews, and some said this unit would not output the rated current. I have seen this 55amp unit output 45amps when my two group 31 batteries were at 12.5V with an additional 12V load of 16 amps. Also it switches between charging cycles as you would expect. But FYI, I have a Honda EU1000i generator and it cannot start this charger if the battery voltage is below 13.4V. So I needed to use a 10 amp charger, bring the batteries up to 13.4, and then switch over to this charger. I called the manufacture to ask if there was any way to limit the maximum current. And they answered the phone! There is no way to adjust it. You can adjust the voltage levels but this would not be enough or the correct way to fix this. They told me for my Honda eu1000i I would need to go to the 35 amp model. The fan is noisy and only runs at one high speed.

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.

Works great!!

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.

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.

Set this up to run my trolling motor. Has two modes. Constant voltage or phased charging. Easy to follow directions, but will need a volt meter to set up correctly.

Super easy to install.