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

I couldnt be any happier with this purchase! Great quality American made product at a reasonable price. Does exactly what its supposed to do right out of the box. My 20 year old 45 amp converter went belly up, so I replaced it with this 55 amp unit. Unit was on my doorstep within 48 hours. Took about 30 minutes to install including time to drill a couple of new holes to accommodate the larger unit. House batteries were fully charged within 12 hours and system voltage has been floating at 13.1 ever since.

UPDATE 12/26/19 I found good instruction on how to set this up. Disconnect the charger from the in coming AC supply. On one side of the charger there is access to a micro switch to set the charger onFIXED or 3 STAGE . Get a flashlight and a tweeker (small screw driver, philips is best, a very small straight slot will work). Set the micro switch to the fixed position. With the charger connected to the battery(s) and nothing drawing energy from the battery(s) (this is called no load) and the AC supply connected the the charger place your multi meter on Volts DC (VDC), read across the two output terminals. If the output voltage is not 14.4 VDC, there is an adjustment next to the Fixed / 3 Stage micro switch. Careful!! These adjusters are delicate and sensitive to pressure! Gently turn the adjuster counter clockwise, while monitoring the DC voltage on the output terminals of the charger. Once you have the voltage set to 14.4 VDC, disconnect the charger from the AC input power. Change the micro switch to the 3 Stage setting. Plug the charge back into the AC supply. Your charger should boost the battery(s) up to 14.4 VDC, then go into float mode. Mine works correctly now. All is happiness now! I have this connected to a bank of 3 deep cycle batteries. The charge stops at 13.2 volts. The information indicates the charger has Boost (normal charge pushes the battery up to 14.4 VDC) Float which like a trickle charge once the voltage reaches 14.4 VDC. Equalize ( forces the batteries up to 14.7 VDC to mix the acid and water and may desulfate also). This charger stops at 13.2 VDC. This is from the manual: ADJUST FIXED VOLTAGE DESCRIPTION: The unit is on the three stage charging mode firstly. From this statement I believe the charge is setup from the factory to provide the 3 stages of charging, I described above. Based on other customer comments I would not recommend this Converter.

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

Used this to replace the one on my 20 year old RV.

This was exactly what I needed. Easy to install, I’m not a very “handy” gal and was able to change it out myself.

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.

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 use this professionally as an automotive technician. It allows me to supply a clean DC power supply to the vehicle while I perform sensitive tasks like control unit programming. Modern day system control units sometimes allow a programming operation only one time to a module. If communication is corrupted at any point, youve essentially bricked it. What I love best about this product is the battery charging feature. It was able to bring back old dead batteries that other chargers could not. It has very literally saved me money! Also, the 55 amp (for this model) crank assist feature is STRONG. Remember youll need to make up some leads for yourself if you intend to use it like I am. I cut up an old set of jumper cables.

Got this last May for my camper. Worked great until last week when the voltage regulator went out. I called the company and they shipped me a new one in 3 days.

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.