1 kh a day, roughly is consumption. If you are running an inverter there will be some losses. Maybe 1.5 kw hours would be a safer number, esp. in the summer when the fridge has to work harder.
What percent drawdown on batteries are you willing to take? If you don't want food to spoil and cannot go back to the grid, you'll need maybe 3 days battery backup for inclement weather.
How many hours a day of direct sun do you get during the least sunny time of year?
Hours of sun x panels watts must = at least 1.5 kwh per day average.
4 hours x 350 watts or 5 hours x 300 watts is enough
A safe drawdown assuming a full recharge might be 1/2 of the battery's ratings
Three days at 1.5 kwh is 4.5 kwh storage needed times 2 for safe drawdown (no sulfation)
Nine kwh of storage with 3hundred or 3hundred fifty watts of panels.
12.5volts times 720 amp-hours = 9000 watt-hours