POWER CONSUMPTIONEverything you 'switch on' consumes electricity, even the panel lights and voltmeter, Add up the amp  hours per  day of everything you use to see what battery capacity and charging arrangements are necessary. Although the fridge is 'ON' all day, the compressor runs only as demanded by the outside temperature and the thermostat setting. All other consumptions are a guess at how long each item is used per day.