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

Out of box the voltage was set right. Measured 10A from a battery 90%+ full. Waited until morning battery was on 12.2v and measured peak of 46A. After 30 minutes it stabalized at ~40A. Some reviews have you believe these only output about 55% of rated capacity. Not true but you need the proper size wiring at least 4awg with sub 2ft run), enough battery to accept it, and it has to be drained enough. Runs fine off sportsman 2000 open frame generator at 2000ft elevation.

I love the LED light letting me know at a glance that the ststem is working :)

Good power supply for ECU programming. Holds constant voltage during ECU module programming. Auto shut off if another power source is detected. Charged fully drained battery under 45 mins. Only con in this power supply is that it doesnt have power supply voltage reading measure display, you have to use volt meter to determine the measurement under fixed voltage supply. If you are programming BMW ECUs I recommend you set the fixed voltage to 14.2 vdc so your output value on terminal 15 and terminal 30 remains between 13.6 to 14 vdc. Voltage supply only fluctuates for the first few mins.

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.

Was very easy to install and works great, have had on my rv for a couple of months and still working great.

Very nice converter. Used on a Boat. Would purchase again.

Easy to install. Solved my dimming issues with the 12 volt system and undercharging of the battery. Was a replacement to the OEM WFCO unit that didn’t last a full year of usage.

The length and width were ok but depth of my distribution panel was short. I was able to cut off one side of mounting feet and now is ok. The 3 stage rate is exactly as specified. The fan noise is noticeable but not excessive. Very satisfied with operation at this point.

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.

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.