RVers, I took some time and did a side by side comparison of 5 different 75 Amp power converters to see if I could help you decide what you might want to buy.
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.
Perhaps Taiwan with distribution warehouse in Elkhart Indiana
Canada. Exact detail not readily apparent on web site
35 Amp Product Part Number
11 x 8.5 x 4.5
12.9 x 7.1 x 4.3
16.25 x 7.50 x 4.38
13.7 x 10.3 x 4.7
12.6 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
Converter/Charger is 75 Amp DC
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.
Converter/Charger - 75 Amp - Switch mode technology provides the quality battery charging and power conversion your RV needs. Features clean DC output, two charging modes (13.6V and 14.2V), low operating temperature, built in protection, and more. Works in conjunction with the IQ Smart Charger for automatic three stage battery charging, providing safer charging and longer life for RV batteries.
Parallax Power Supply 5400 Series Deck Mount Converter. The 5400 Series of converters is part of the Paramode family of products and are compatible with accessories such as the TempAssure module. The 5400 Series of deckmount converters feature active power factor correction which makes better use of incoming power. This allows operation of the 65 and 75 Amp DC converters on a 15 amp receptacle. 75 amp converter/charger with temperature compensation, AC Input 105-130 Volts 60Hz, 1260 Watts.
4-stage battery charging
Great for battery banks with up to 8 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.
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.
57 Ratings @ 4.3 Stars
104 Ratings @ 4.7 Stars
79 Ratings @ 4.5 Stars
Not enough to be statistically significant.
Find on Amazon
RVers - RV52.com will try to do a nice Amazon search for RV 75 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.