RVers, I took some time and did a side by side comparison of 5 different 35 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.
BIG TAKEAWAY: I think for a few extra bucks people tend to buy bigger (more Amps) power converters. Why? The bigger converters will last longer and why would you cut something so close when you could spend $20-30 more and simply get plenty of capacity.
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 Size Calculator.
Manufacturer:
PowerMax
WFCO
Progressive Dynamics
Parallax
Go Power
Where Built/Designed/Etc
Bradenton, Florida
Perhaps Taiwan with distribution warehouse in Elkhart Indiana
Marshall, Michigan
Anderson, Indiana
Canada. Exact detail not readily apparent on web site
35 Amp Product Part Number
PM3-35
WF-9835
PD4635
4435
GPC-35-MAX
Dimensions (inches)
12 x 9 x 4
11.6 x 6.4 x 4.6
13.8 x 8.5 x 6.2
10.5 x 8 x 4.5
12.6 x 9 x 5.1
Weight (pounds)
6.3
4.8
9
5
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
Overload
Short-circuit
15761 Converter/Charger is 35 Amp DC, and replaces Progressive Dynamics #PD9130. Parallax #7430. Atwood #32. and Iota #DSL-30.WFCO Converters come with the following features and safety protection:FEATURES: 3 Stage battery charging system. LED fuse boards. UL, cUL-Listed FCC Class B.PROTECTION: Reverse Polarity. Over Temperature. Short Circuit. Overload. Over-current. Current controlled fan.
35 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
The 4435 Deckmount Converter by Parallax Power Supply is a three current stage 35 Amp converter charger. The new innovative design invites more airflow and allows key components to operate cooler and in return, last longer. The 4435 is equipped with a 120VAC 15 amp line cord. It is built with a steel enclosure and has a durable powder coat finish. Can be upgraded to TempAssure™ technology by installing the Parallax 4400TAU module to maximize battery charging.
4-stage battery charging
Great for battery banks with up to 6 batteries
UL listed
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.
Stage 1: "bulk charge". Full output into the batteries.
Stage 2: "absorption" - batteries at 14.4 Volts direct current - tapers off the amps going to battery.
Stage 3: "float" - 13.5 Volts direct current - avoids excessive gassing of the batteries,.
Stage 4: "equalize" - For multiple batteries. Charges the batteries to a higher voltage than normal to ensure that all batteries stay at the same charge level.
Amazon Ratings/Rankings
62 Ratings @ 4.2 Stars
8% 1-Star
27 Ratings @ 4.8 Stars
0% 1-Star
21 Ratings @ 4.9 Stars
0% 1-Star
No ratings
2 Ratings @ 3.6 Stars
0% 1-Star
Find on Amazon
Find at Camping World
Not found @ Camping World
Not found @ Camping World
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Find at Walmart.com
Not found @ Walmart.com
Not found @ Walmart.com
Not found @ Walmart.com
Not found @ Walmart.com
Not found @ Walmart.com
Here is an alternative 35 Amp Power Converter from Walmart that MIGHT be interesting...
RVers - RV52.com will try to do a nice Amazon search for RV 35 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.