We have 2015 351DS, Res. Fridge. I'm not sure where your water heater access is...but ours has a reset switch on the inverter in outside compartment next to the water heater. It is specifically for the fridge. We have a surge protector but the inverter was still tripped a while back. Everything else is the same. Just keep i mind it takes a few seconds for the fridge to come on when going from land line to batteries.
One final note, run the ice maker as much as possible as soon as possible. Ours went out the first week we got it. Your deal probably won't and can't fix it. Frigidaire has to come out. Our repairman said he had to change quite a few of the tray assemblies due to something, blah, blah, blah...works great now.
2015 Georgetown Forest River 351DS MH
2008 Keystone Cougar 293SAB 5th Wheel
2007 Jay Flight 30.5RLS 5th Wheel
2006 Jay Flight 29BHS TT