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

UPDATE 12/26/19 I found good instruction on how to set this up. Disconnect the charger from the in coming AC supply. On one side of the charger there is access to a micro switch to set the charger onFIXED or 3 STAGE . Get a flashlight and a tweeker (small screw driver, philips is best, a very small straight slot will work). Set the micro switch to the fixed position. With the charger connected to the battery(s) and nothing drawing energy from the battery(s) (this is called no load) and the AC supply connected the the charger place your multi meter on Volts DC (VDC), read across the two output terminals. If the output voltage is not 14.4 VDC, there is an adjustment next to the Fixed / 3 Stage micro switch. Careful!! These adjusters are delicate and sensitive to pressure! Gently turn the adjuster counter clockwise, while monitoring the DC voltage on the output terminals of the charger. Once you have the voltage set to 14.4 VDC, disconnect the charger from the AC input power. Change the micro switch to the 3 Stage setting. Plug the charge back into the AC supply. Your charger should boost the battery(s) up to 14.4 VDC, then go into float mode. Mine works correctly now. All is happiness now! I have this connected to a bank of 3 deep cycle batteries. The charge stops at 13.2 volts. The information indicates the charger has Boost (normal charge pushes the battery up to 14.4 VDC) Float which like a trickle charge once the voltage reaches 14.4 VDC. Equalize ( forces the batteries up to 14.7 VDC to mix the acid and water and may desulfate also). This charger stops at 13.2 VDC. This is from the manual: ADJUST FIXED VOLTAGE DESCRIPTION: The unit is on the three stage charging mode firstly. From this statement I believe the charge is setup from the factory to provide the 3 stages of charging, I described above. Based on other customer comments I would not recommend this Converter.

Wed been having issues with our second WCF 9880. The second WCF had been in for 3 years and in the last year had been spotty in its use. Had to turn off the power several times and reset the WCF. Read any number of great reviews about the Powermax. Bought one, changed it out for the WCF 9880. Wow - right out the box it just works! Started off at 14.4 volts to take up the slack for the WCF, after about 2 hours dropped back to 13.6. Looking for the 13.2. Some other reviewers stated it was noisy - not for us. Fairly quiet. Fingers crossed it lasts for more than 2 years.

Couldnt just plug it in to an older system so installation can be difficult. I am using in a truck camper. Now that it is installed I am very pleased with it so far.

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.

I used this unit to replace an 80 AMP Intellicharger in a 40 5th wheel travel trailer/toy hauler that is in year round use. The unit replaced had been severely damaged by a mysterious power surge on the 120v AC input along with several other appliances in the trailer. It is working perfectly and having no trouble doing what its supposed to do. If the Trailer were not on nearly continuous AC shore power I might have gone with a higher output PS/charger but this one does just fine at less than half the cost of the unit it replaced. I reserved one star in my rating because who knows how long it will last.

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

I’ve used this for a couple months now and this was very easy to use and setup!

Works well

Needed it for our travel trailer, as soon as it was installed everything worked the way there supposed to.

It has a three stage charging system.