OP, since you have a 5er it would require at least two more batteries an a inverter if you do not already have one. Samsung refers do well on a MSW inverter because the compressors are DC, not AC like most. I added four more batteries, a separate PSW inverter, another transfer switch, and a 100 amp charger as we boondock often. This system will run the refer for two days before needing to charge the batteries... longer than the rest of the MH electric needs.
Here are
200 posts in the last year on this subject and my DIY install
here.