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

Make sure you hook the blue wire back up if it’s a replacement for RV!

This was purchased to replace a single-stage charger/power supply in an older travel trailer. The older units bulk charge only design apparently contributed to shortening the lifespans of several (ruinously expensive) deep cycle batteries, something I didnt want to see repeated. This units three-stage charging should help address that issue. This unit was of slightly different dimensions than its open-deck predecessor, necessitating some engineering of the plastic enclosure, but that was known at purchase, and was not an issue. The fan-noise is quite reasonable, and is only active when needed. While I didnt open the unit to see its contents, the good quality of the metal case and exterior connections leads me to believe the the same quality is present electronically, an opinion supported by solid output voltage/amperage over two weeks of initial use.

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.

I use this to power up my test bench, test car amplifiers and car stereos and at the same time charge my battery, really good buy

I installed this in my RV to replace my factory converter. The factory converters are loud and inefficient. I installed this unit in my front cargo compartment and ran new 6 gauge wires directly to my batteries. As other reviews have stated the fan speed is not variable, but it does only turn on when needed. For example, my factory converter runs the fan at full speed when pushing 8 amps into the batteries, this unit can do over 8 amps without the fan running at all. Also, in my initial testing this thing pushed 3x the amps into the batteries as the factory unit. Strongly recommend this unit for mounting in a cargo area. This will allow my to charge the batteries much more quickly when dry camping and using the generator.

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

After I had a professional come out & fix my wiring problem, the unit works fine.

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.

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.

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