An answer to a question please?

The newer motorhomes and 5rs that have the residential fridge have an inverter installed that is dedicated to the fridge. It supplies 110 to the fridge from a battery.

Thank you! So boondocking is not out of question?
We boondock at the lake and mountains and we want them to join us but we're concerned they couldn't because of the fridge.
Thank you again, Okie

His only limits in boondocking is the size of his battery bank.
Solar may be an option.

Thank you ScottG and wrgrs50s. I appreciate the info.
Now we'll be comfortable asking them to join us at the lake!??

Yes we have 6 batteries to run the fridge and other items
if the batteries run down they can run their generator and charge them back up

They will likely be able to dry camp without issue as long as running their generator from time to time is OK. Depending upon how they use the coach and what goodies they want to use the generator will likely need to be run a bit at night so they can watch TV and cook and this will keep the batteries charged before going to bed. There should be plenty of battery power to keep the fridge running over night and since you are going to need power for the coffee maker and breakfast, running the generator for a few hours in the morning will get the batteries charged back up again. Solar can help with the morning but won't help at all for the evening hours so a generator is still going to be necessary to some degree.

Yep, will need to run generator for few hours each day to recharge the batteries. As noted, will need a decent house battery bank to power the inverter to run the fridge when not on shore power or running the generator.

Another option is to install a sufficient solar panel set up to keep the batteries charged. Even so, will need to run generator some if in shade or on cloudy days.

Ask them to join you but dont park real close to them so you dont hear the generator auto start at 4 am.

Having recently gone residential, with two batteries for the refer nothing has changed in our boondocking power usage. Before the residential we had to run the generator aprox 2 hours/day when boondocking BUT I added an additional charger.

Okie in Wyoming wrote:
Our friends just bought a 40 foot motor home, planning to travel a large part of the year.

"Your friends" need to ask a dealer or the maker of the fridge how it is supposed to work.

If bought new, they should have gotten a set of owners manuals.

IF you could supply the make/model of the MH and the make/model of the fridge, someone here might be able to help.

A google search for the make and model of the fridge probably would help more.

(Edit) Well your original post didn't ask the REAL question.....so my first answer wasn't appropriate for the situation.

So, if these really are friends, have a discussion with them about their "dry" camping capabilities and desires. The refrigerator may not be the only issue.......or even an important one.