Her boat doesn't have any diesel or petrol engine, it cruises exclusively from solar powered electric engine
Does she live on this boat year round? If so, how does she keep the batteries charged during the winter?
We have an off-grid holiday home. No mains services at all. We have solar panels for electricity. They run the lighting, water pumps (fresh and rainwater harvesting), fan for the composting loo and the occasional 240v appliance for short periods. It works fine in the summer but in the colder months, due to the lack of daylight and extra drain, we need to run the generator for several hours a day to keep the batteries charged.