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.

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.

Troubleshooting electrical issues in my new to me used RV revealed no 12 volt power charging the house batteries when plugged in to shore power. Sure enough -- the old converter was shot. Looked online for replacements and found this Powermax converter at a reasonable price and in a form factor that would easily replace the dead converter. The 12 volt connections tighten down easily using a slot screwdriver. The previous converter used hex allen screws, which can be a pain if you have misplaced or lost the proper size wrench. No issues here--everybody has lots of screwdrivers--even neighbors! The two 30 amp safety fuses are easily accessible if you ever need to replace them--a nice touch. The converter is quiet and charges in three steps just like advertised (confirmed by my voltmeter). I bought the 55 amp model as my previous converter was also 55 amps. But, I would not hesitate to go for a higher amp model if I were to do this again.

I work for Mercedes Benz and their equivalent cost 1,000$ from midtronics. This does the same thing for under 200$!!!

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.

Easy install and no noise at all, works great in our 5th wheel

Directions left a little to be desired but works great in my RV

It fit

Worked great!

The converter arrived on time and worked perfect right out of the box! My motorhome batteries were low so it ramped right up to 14.6 volts, stayed there for about 2 hours, then dropped to 13.8 volts for about 4 hours then went to 13.2 volts and has maintained there ever since. The next day I turned on the furnace all of the lights and both tvs and it held steady at 13.3 volts. It has only been a few days, but at this point I couldnt be happier with this Power Max Converter! Here is the link to a pdf that shows how to install it, that was easy to follow and worked perfectly. Ive had it now for a couple of months and it is still performing great! [...]