As others have said, the fridge does not draw much current. However, it is on 24 hours a day. If you have 1 battery, it probably has a capacity of about 100 Amp hours (AH). Of the 100 AH you should not use more than 50% for good battery life.
The 15 or so AH the fridge uses each day is a significant percentage of your battery power. Probably only the furnace is a bigger user if it is cold out. Excessive use of incandescent lights is also a big draw but during the summer they are not on that long. Replacing them with LEDs makes a big difference. Check out eBay. The water pump also draws a lot of current so take short showers.