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

OK gang, everything went smoothly until I went to shove the new converter in place of the original WFCO. The new Powermax didnt fit!! Specifically, the mounting tabs on either side of the new Powermax converter prevented the new unit from fitting in the WFCO housing.......so, out came the saber saw with metal blade and off came the mounting tabs. It was a tight fit but all is good now. Dont forget to calibrate the Powermax voltage per the manual and so far on startup this 3-stage converter works as advertised. By-the-way, I live full time in a 2018 Coleman 26 Lantern pull trailer and I plan to do more boondocking in the future so Ill be relying on the trailer batteries more often including an 81-watt solar panel and a Honda eu2000i generator. Cheers All!

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.

760 watts at 60 amp is what im seeing out of this and it sure beats the 55 amp battery charger i was using all to HILL. This thing took no time to charge to absorption mode from 853 amp/hr battery bank that was 80% and the 10-15 amps coming in from solar didnt hurt it one bit infact that made it use less electric. I was concerned that the solar charge would blow it but nope it helped it be more efficient instead by not having to carry all the load of charging the batteries. ordered it 7-20-14 got it at my door 7-23-14 NICE! About the fan its temp controled was not on at idle and did not turn on till like 5 minutes after i hooked it up. and the air was not super warm but was warm and LOUD. While this thing is on Idle not doing anything at all it uses a whole 15 watts of electric thats one super bright CFL light bulb at about 900 lumens rated. I realized this kind of power is acutally low for a solar system but for me topping off my battery bank and the use ill have for it its enough. My normal solar useage is at 15-20 amps drain on the batteries from inverter around 200 -250 watts with this charger/power supply ive still got enough left over to charge the batteries at a slower charge rate plus what ever im getting on cloudy days from solar. Final thought- as long as this thing holds out and last Ill be happy with it Ill know more later i just got it and hooked it up today. 7-23-14 7-25-14 left it plugged up with out the dc cables connected to the battery overnight and through the work day got home checked it out and discovered warm air floating out of the top hooked the dc cables up to the battery cables to boost the batteries a bit and it had hardly any output at all. Unplugged it and unhooked the DC cables for a couple of minutes connected the dc cables plugged it up and it started working. HMMMM suppose my suspicion was correct about the leaving it plugged in and not connected to anything. DONT DO THAT for charging mode 8-24-15 Update: Still working great ive had to use it alot during cloudy days output is 53 DC amps useing 750 ac watts. About 2 months ago started hearing the fan after it gets turned on but it gets quite again after a few minutes. My guess its a cheap fan and ill have to replace it soon. 2-15-16 Update ok replaced the fan with Artic F8 TC fan doing great but ive had one part not survive. Turns out (without the help of Power Max i got no return call back) that this part is a NTC thermistor ive changed the part 2 times already and havent had the rite value to keep it going this last time lasted a little over 2 months im thinking they over compensated on the cheap fan and high speed to make up for the 10 dollar part i have coming in now this part gets REALLY hot it provided a buffer level and dampens when the unit is first turned on so that the main component are NOT getting full power when the unit is turned on during the charge state. The last part i put in was rated at 15 amps this next one coming in is rated at 35mm disc 2 ohm resistance 35 amps and can handle 235 degrees before failing. I think this might do it the trick but then again the unit is rated at 55 amps Im an electronic tech so i know not to over due it to much heat and the board will burn and not enough rating it will blow again. I may be willing to give it one more go with a 50 amp rate NTC Thermister but that cost is gonna be about 20 bucks plus shipping. Hopefully this 35 amp rated one does the trick. Ide hate to have to go back to a high speed SUPER LOUD fan the Artic fan has really good air flow and quiet but the delay time for it to turn on from factory settings is just a bit long. update 6-16-16 unit fixed no more problems with it at all its held up just fine with the last part that i got. Shame on power max for putting a weak component in this unit but if they built them to last they would be out of business i suppose

Worked great!

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.

So far so good, I use it to charge the two house batteries and all the other dc stuff in the bus,If you get an over load like I did due to my wiring error it shuts unit down an says OL ,then you just power it down unplug and restart once your wiring is good again ,It puts out 3 separate charge amounts allowing constant power to what needs juice, the 14.9 volts for house batteries ,Im pretty happy with the unit ,the fan tends to run a fair bit but its not noisy and hasnt changed since Ive had it and its ran for months non stop.

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.

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

It was very easy to install

Works like a Champ on our RV