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A common problem with an inverter of 1800 to 2000 watts - needed for the use you describe - is that the inverter often shuts down due to low voltage if the battery bank is too small. An inverter supplying 1000 watts is consuming 100 amps DC. A single group 27 battery can only sustain that for a few minutes.
 

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one of my 3 legs on my 20A, 36V charger to top off the secondary bank when I'm on shore power.

Using the Engel as either a freezer or refrigerator draws the same 2.75 amps
For a 40 quart Engel the specs are .7 amps as a fridge and 2.5 amps as a freezer. In other words about 17 AH/24 hours as a fridge and 60 AH/24 hours as a freezer in 77F ambient temps.

36 volt charger?
 

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You cannot charge 12 volt batteries with that charger.

I'm guessing he has a 3 output 12 volt charger not a 36 volt charger which would not work.
 
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