The size and capacity of these independent power supplies varies from person to person and family to family. Remembering that air conditioning and any product that generates heat uses a great deal of power. Plan your system around your basic needs and if air conditioners, heaters and microwaves are used it would be better to use mains power or a generator rated to the capacity of the products in question. Remember that even some of the new quiet generators may not be used in some parks and reserves
Your typical family would need power for a few 12V lights, T.V., radio, water pump and an inverter to convert 12V DC to 240V AC to charge laptops, cameras and mobile phone batteries. In some cases there will be a 12V Compressor fridge that will need power if not fitted to the car and being powered off the car’s dual battery system.