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

Needed it for our travel trailer, as soon as it was installed everything worked the way there supposed to.

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

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

Priced right. Good quality unit. I removed the World Products power supply and easily slid this in its place making no mods . Received it the day before leaving on my vacation. Charges my agm batteries well. Fan comes on as needed for cooling and does not run excessively, or as noisy like the World unit. There is a green led light next to the fuse that is handy for quickly check that it is functioning. I did not want to cut the ac plug off to wire it in so I used the end of an extension cord for the connection. this way I did not cut into the products original wiring. I am very happy with the performance of this converter/charger.

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.

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.

It did its job but with weird nuances. 2.5 years in it started acting sporadically. Its almost like it was ignoring the potentiameter for setting the charging voltage. Brand new, it had no problem bulk charging at 14.1V for my batteries. During our last trip, it cut out and tripped a GFCI outlet(We didnt know thats what tripped it at the time). Checked all of the equipment and everything else in the RV was running fine. No odd voltages. Got home from the trip and noticed the bulk charge was stuck below 13.5 volts instead of 14.1 where we had it set. I was fed up with the unit and vowed to repalce it before our next trip. The next day, I checked on my rig and found that one of my AGM batteries exploded and the the charger was running at 14.8 volts?!!!! WTF!! I was livid. That was a very expensive battery. I immediately disconnected it and I am grateful it didnt burn down my RV. I will never again purchase a product from this company.

You loosen 3 screws on the old one and unplug it. Put the wires back just like you took them out and plug it in. DONE 10 mins. I was a bit surprised that the exact brand and part number that I replaced 2+ years ago had already died. Im giving the same brand another chance. Its says RV so open your wallet.

I got this to replace my cheap supposedly 3 stage converter that only charged at 13.6V no matter what. This converter works as expected, 14.6 when batteries are low, 13.6 when filling up and 13.1 float. When the fan runs its not silent but not the loudest thing Ive heard either. Im sure this will help me recharge faster when I am boondocking on generator.

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