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A solar panel is a 12 volt charger so doesn't compare with 240 volt electrics that's why some people prefer to use a generator because the appliance does produces 240 volts but at a lower wattage rate than electric hook up. When I go on a rally or a temporary holiday site where there is no electric supply we take a 30 litre camping water carrier with a closing spout and put it outside on a small table merely just to fill the kettle which reduces the use of the water pump therefore thus in turn saving battery power. We then only use water in the caravan via the pump for washing hands or face, cleaning teeth and shaving etc. plus washing up dishes which all saves on battery power for lighting and tv viewing in the evening. I then use a generator for about an hour each day (weather permitting) to replenish the battery and charge any appliances whilst connected such as mobile phones etc. If you have a caravan with a 12 volt flush then this also consumes energy from the battery so you have to be somewhat cautious about saving energy. Basically the more energy you consume the bigger solar panel you need that's why some people opt for a 100 watt panel minimum.