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

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

Loud noise but works great

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.

The PowerMax PM3-55 worked well on the bench and charged my new AGM batteries. I like the fact that the voltage is adjustable. There is a tiny switch that lets you adjust a fixed voltage (set with a small trimpot next to the switch). Important note: The adjustment affects the voltages on either setting of the switch (including the normal setting which affects the voltages during the 3 stages of charging; Bulk, Absorption, and Float), but either way the adjustability is a plus ! The unit did not quite fit (as an exact replacement for the WF-8955 Converter/Charger) in my sons RV (very close though, and probably could have made it work with slight modification). Since this was intended as an upgrade (and the original was still working), we decided to leave well enough alone and leave the original in place. In any case, Im sure I will be able to make use of it as a nice charger for my car batteries when needed.

Easy to install. Replaced old converter because no longer charged coach batteries. Has adjustable charging capability. Great price.

De que dejo de funcionar y no me responden para mi garantia

As advertise easy to install packaging was good quickly got here and it’s been running ever since two months no issues

This converter is a replacement for one that failed in my RV. It arrived on time and I promptly removed the old one and installed this one. It was a little effort to install it since the base was not quite the same size as the previous one and the space it sits in is small and difficult to work in. But after testing it and installing it, it is doing a great job keeping my 12 volt system fully charged and functional.

perfect for DIY! easy install, all contact points labeled. works great.

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.