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

Easy to install and simply works great. Can have all 12v lights in my travel trailer on and they never run down when the unit is on - which was not the case with the original unit i had. This Powermax is really a great repalcement unit

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

So far it has done as should. Very pleased!!! We installed it on our boat to keep the battery charged and run the 12v system while in the harbor. Working great. Could not be happier!!!

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

I absolutely love this power converter. Easily powers my 1100 watt amp and pioneer head unit. The fan is hecca silent and only kicks on when needed. I completely recommend this product.

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.

Upgraded my RV house battery to a 100Ah solar-type SLA / AGM deep cycle battery and learned they need 3 stage charging. The converter in my RV is a very old 2 stage charger. Talked to the battery maker support team and they said my converter would not hurt the battery but that it would never charge the battery over 80 to 85% of full since it didnt have the 14.6VDC mode. So I removed and replaced my old RV converter with this unit and it works great! I bought a battery monitor so I can watch the rate of discharge in detail so I know when to fire up the generator or plug into shore power.

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

My Atwood had brackets factory riveted to secure in place. I transferred those to the Powermax. Make sure your not drilling into to something critical inside if you do this. Also my Atwood was wired into a junction box, the Powermax comes with a standard 120v plug. I added a quality 20amp outlet and was in business. I also changed to 2 6v golf cart batteries wired in series for more capacity. I have been cooking batteries for a few years now. Those days are over. So happy I put this in.

Installed in my toy hualer works great. Definitely a upgrade from the old one.