RVers, I took some time and did a side by side comparison of 5 different 55 Amp power converters to see if I could help you decide what you might want to buy.
I honestly thought I might be able to find a "smoking gun" - you know where I could say definitely "this is the best" or "this one is good to avoid", but I didn't.
Surprise #1: I read over and over again about WFCO having trouble with quality, but you simply cannot find that "feelings" based internet sentiment BORNE OUT BY DATA - which would be the Amazon ratings. If anything, the WFCO gives MORE features for less money than all the others. I don't think you can find any real reason to avoid WFCO. I don't think you would go wrong.
Non Surprise #2: Power Dynamics looks to be a strong converter, which I know because I purchased one. However, I don't know that it is head and shoulders above everyone else. It looks like everyone makes a strong converter.
Surprise #3: Using Amazon as "proxy" for shipping volume, it looks like the PowerMax is a very high volume converter - similar to WFCO which seems to have themselves installed in most of the newly manufactured RVs.
Surprise #4: Some of the converters claim to be able to charge Gel batteries which seems very interesting to me.
Surprise #5: The "Go Power" converter has the ability to level charge on a bank of batteries. I thought that was cool.
In general, I don't think you can go wrong with any of the converters. It is amazing to see so many manufacturers have so many close ratings on Amazon.
A note about Amazon ratings. I FEAR that many of these ratings are entered soon after purchase. What this means is that you get no real metric on the lifespan of a converter. This is why if there was some metric that might be hiding quality, it might be the weight. Theory: More weight on a power handling device indicates components that are likely overdesigned. This overdesign gives the converter extra life. This is of course, just a theory.
Question: How do you know how many Amps you need? You first count all of your 921 lights and just use 1 Amp for each bulb. That can add up really fast. I would allow a few Amps to charge the battery. I think you can ignore the igniters for LP gas stuff, but for the water pump that would take several Amps (read the literature) for somewhat extended periods of time. If you can afford to buy a bigger (more Amps) converter and you have the space for it, this seems like a no-brainer to me. You can try the RV Power Converter Calculator.
Perhaps Taiwan with distribution warehouse in Elkhart Indiana
Canada. Exact detail not readily apparent on web site
55 Amp Product Part Number
11 x 8 x 4
11.6 x 6.5 x 4.3
13.4 x 10.4 x 7.7
9.7 x 5 x 3.4
12.7 x 9 x 5.1
Manufacturer Key Stated Features
3 stage battery charger
13.2 Vdc range
13.6 Vdc range
14.4 Vdc range
Ul and cul approved
Reverse battery protection
16843 Converter/Charger is 55 Amp DC, and replaces Parallax 7455, Atwood 55, and Lota DSL-55.
WFCO Converters come with the following features and safety protection:
3 Stage batteries charging system.
LED fuse boards.
UL, cUL-Listed FCC Class B.
Current controlled fan.
55 Amp Inteli-Power 4600 Series Lower Section Replacement/Upgrade Converter for RV power systems is as close as you can get to a universal replacement
The 4600 Series Converters can be used to replace the lower section converters in Magnatec, Parallax and WFCO power centers
They are made in America and have the same impressive quality, performance, reliability and multi-patented features, including the Charge Wizard built-in
The Inteli-Power 4600 Series Converters are what you need for reliable 12 volt power
CONVERTS NOMINAL 108-132AC VOLTAGE TO 13.4 DC VOLTAGE FOR BOTH LOAD OPERATION AND 12V BATTERY CHARGING
IDEAL FOR CHARGING ALL TYPES OF 12 VOLT LEAD ACID BATTERIES INCLUDING FLOODED, ABSORBED GLASS MAT ( AGM ) AND GEL CELL
AS A POWER SUPPLY THE UNIT’S TIGHTLY CONTROLLED REGULATION ALLOWS THE USER TO OPERATE A NOMINAL 12VDC LOAD UP TO 55 AMPS
AS A BATTERY CHARGER THE UNIT WILL MAINTAIN THE BATTERY DELIVERING ITS FULL RATED CURRENT WHEN THE BATTERY CAPACITY FALLS SUFFICIENTLY LOW
VOLTAGE IS SET TO DELIVER ITS MAXIMUM CURRENT FOR THE NECESSARY PERIOD OF TIME TO MINIMIZE UNDUE STRESS TO THE BATTERY CAUSED BY HEATING OF ITS CELLS
4-stage battery charging
Great for battery banks with up to 6 batteries
Compact design to fit in small spaces
The charger is built to charge flooded or wet cell batteries to 100 percent by using 4-stage charging. The first stage of charge is called "bulk charge", this is when the charger puts its full output into the batteries.
The second stage is "absorption" where the charger holds the batteries at 14.4 Volts direct current and tapers off the amperage going into the battery.
The third stage is called "float" when the charger drops the batteries to a lower voltage of 13.5 Volts direct current to avoid excessive gassing of the batteries,.
The fourth stage is called "equalize" and this is used when you have more than one battery. Equalize will charge the batteries to a higher voltage then normal to ensure that both batteries stay at the same charge level.
263 Ratings @ 4.5 Stars
294 Ratings @ 4.7 Stars
120 Ratings @ 4.7 Stars
79 Ratings @ 4.5 Stars
11 Ratings @ 4.5 Stars
Find on Amazon
RVers - RV52.com will try to do a nice Amazon search for RV 55 Amp power converters.
This is just in case the selection above doesn't give you a good variety and you still want to browse around some more.