Residential Refrigerator Install Planning

[drifterpilot]

Shortly, I will be removing my Norcold 1200 refrigerator and installing a residential refrigerator. I am thinking about the Samsung RF197 if I can find one available. If not, something very similar.
My coach came equipped with a small 300 watt quasi-sine wave inverter that powers my entertainment center consisting of the tv and DirectTV dvr.
I also have a 1750 watt quasi-sine wave inverter coming directly off the batteries for my CPAP machine and occasionally running the Keurig coffee pot. This inverter is on the opposite side of the coach from the refrigerator.
What would be the minimum size pure-sine wave inverter that I should be thinking about. I realize that some refrigerators will run on a quasi inverter, but if I am going to purchase an inverter, I might as well get a pure sine wave.
I have two house Exide 31XHE-V batteries, 925 CCA, 1050 CA and 180 RC each. They are about two years old.
We don't boondock but do overnight periodically in Rest Areas and WalMarts. Should I consider adding another Group 31 battery (for the new inverter) and tie it in series with the other two batteries? Would rather not if I don't have to, as I pretty much utilize all my available outside compartment space.
Thanks

[time2roll]

Transfer switch allows two sources of power to a single item. The switch chooses one source and prevents back feeding the second source. Typically the choice is between inverter and utility power.

For a dedicated sine wave inverter I recommend a 1000 watt Go Power brand.

www.boatandrvaccessories.com/go-power-gp-sw1000-12-inverter

Transfer switch

www.donrowe.com/KISAE-TS15A-Automatic-Transfer-Switch-p/ts15a.htm

[drifterpilot]

Ivylog wrote:
A 197 uses DC compressor so you do not need a PSW inverter. Use your 1750 and add a transfer switch if it doesn't have one. For overnight you do not need more batteries but crank the generator to make coffee in the morning.

I need someone to explain "adding a transfer switch". What does it do and how is it "wired" in?

Also, I inquired that if I was to install another inverter, what would be minimum wattage inverter that would handle most, if not all, the potential refrigerators?

I am not concerned of doing anything that would affect resale value.

Thanks

[TNGW1500SE]

Oasisbob wrote:
Are you concerned about this affecting your resale value? How will you keep the door closed while driving? I know it is a cheaper route in the short run.

I did this: Door lock

[Oasisbob]

Are you concerned about this affecting your resale value? How will you keep the door closed while driving? I know it is a cheaper route in the short run.

[ILVMYGT]

In addition to the inverter, a good battery charger is also necessary. You will not want to spend all day charging the batteries.

Are the batteries you have deep cycle? Starting batteries don’t do great when used in a deep cycle application. Maybe swapping them out with a couple of 6 volt golf cart batteries would be good. The golf cart batteries would give you about 200 amp hours.

[Ivylog]

A 197 uses DC compressor so you do not need a PSW inverter. Use your 1750 and add a transfer switch if it doesn't have one. For overnight you do not need more batteries but crank the generator to make coffee in the morning.