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

I ordered this converter to replace the giant OEM converter that was sucking our house batteries dry in our 1986 Foretravel Grand Villa Barn Find restoration project. The install was straightforward and simple. I have watched the converter for about a week now and it is keeping the batteries very stable and functional. I have attached a picture to show the compartment that will be an Auxiliary electronics bay. Eventually this will mounted on an aluminum slide out tray for servicing or additional wiring. Although the old converter was a 75 Amp converter, I seriously doubt that the old converter would push the 75 amps, so in this instance, I opted for the 55 Amp model. Under full load, the Powermax is more that adequate. Also the fan noise is about 80 decibels less that the original. Its fan is temperature controlled and is not much more than a whisper when on. the old converter sounded like a box fan from the minute it went on shore power and ran constantly. My thought is: If you are looking to replace your old battery burning converter, look no farther. The Powermax converters are dependable, quiet and will do the job you need quite admirably.

So far, soo good. Its been running 24/7 for a month now with no glitches. The original unit in my RV was not keeping up with the demand of the two furnace motors and its been very cold. The reliability of the unit over the long haul is yet to be verified, hence the 4 stars.

Works well

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

Nice unit. I upgraded my original Chieftans power converter that no longer would charge on-board batteries for unplugged boondocking. The original is a tank! This unit is lighter,much lighter. The components they used to make circuits with, have gotten smaller,if this lasts 25 years also,Ill be spoiled. So far unit functions normally and I can recommend. If youre looking for an exact fit,for securing,you might not find it. However, it does have case mounted tabs, (just as the case of the original did) and those tabs are in close enough position of the original to fit 2 of the 4 holes located inside the motorhomes converter box.But if you are somewhat capable ,you can flex wire -to wrap around longer screws,to fit. Motor homes do not move as much as trailers do in this regard. It is still important to properly secure ANY component that has bolted/nutted connections,as movement during driving can cause loosening over time. One more thing. I recommend placing a pine block under unit if youre doing a swap out in an older closed box application to assist in lining up fan,with motorhomes vent hole.

Update Jan 29 2015, Sent back,. Told it was a mislabeled 15 amp unit. I would recommend others use a good clamp-on ammeter and see what they really got. I ended up buying an Arterra WF-9865 65 Amp DC Deck Mount Converter. Puts out 74 Amps, Fused for 80 Amps, linear reduction in charge until final trickle charge @ 2mA @ 13.25V. Just perfect. Matt Update Jan 8 2015, My 55 Amp unit still performs as if it is a unit rated for 19 amps. After talking with a very polite Service Engineer about this issue and given all the good ratings, I figured I owed an extra round of tests to verify my initial findings. This time using a different set of conditions. Instead of discharging the battery set @ 120 Amps down to 10.5V I reduced the discharge rate to 27 Amp/hrs until the battery source reached the same 10.5V. At this point the load was removed and this charger connected and recharge was started same as in the first tests. Of course, at that point the 230 Amp/Hr battery was in need for the 55 Amp charge rate. Unfortunately the charge rate was again, just 19.3 Amps. Bottom line is.... at this point I am very suspicious. The documentation shows operational mode curves without numbers which makes them curious but useless to me. The units 3 stage charge control intelligence logically transitions as expected but the units maximum output is still just 1/3 its claimed rating. Working with seller to resolve the issue. Matt Submitted Jan 2 2015 (by the guy that bench tests stuff before installing) * Unit is rated for 55 Amps but its maximum output will never exceed 19.3 Amps even while loaded down to 10.5 Vdc. No explanation can justify this as normal. Otherwise it controls excellent as the 3 stage chart indicates. I imagine this unit is mislabeled or defective. * I wish I understood why it came with a 30 Amp fuse. Documentation says its for Reverse Polarity Protection. Sounds like a good feature given this units output connectors are not labeled at all. Meter it and label it immediately if you get one. * If the unit is just defective and not just a overrated output claim I will very likely bump it up a notch and get a 75 Amp replacement but waiting to hear from the seller first. Judging by other readers I hope for a 5 star update soon. Matt

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.

Easy to install. Replaced old converter because no longer charged coach batteries. Has adjustable charging capability. Great price.

Although this product lasted me about four years, can anyone explain how it burned up these two 40 amp fuses all of the sudden out of the blue? It operated flawlessly all this time and then the fuses actually melted and also melted the fuse sockets. At the time of failure it was powered with a 1,600 watt Predator generator - that has also ran many many hours flawlessly before and after these fuses burned up. Since the fuse sockets melted I am not going to replace the fuses just to see what might happen. Thoughts?

I use this to power up my test bench, test car amplifiers and car stereos and at the same time charge my battery, really good buy