On mine I installed a normal household outlet close to my frig. – cut the connector strip between the 2 outlets – one I painted red and connected it DC and the other side to 110volts. And yes, I have installed a 110 volt frig in Travel Trailers. Thing is I like to have my frig running as we go down the highway – when stopped I hook to 120 volts, then
change the plug over to 110volts. Have fun.