Fridge, radio, heating, light - especially in mobile homes, the permanent power requirement is higher than in a normal car. However, a second battery can also make sense in a car for powerful audio systems or other demanding electrical consumers.
Buying a solar system has never been more affordable, thanks to steadily declining upfront costs that have seen the price of solar panel equipment drop by up to 82% in the last decade.
Solar generators are becoming more and more popular for RVs, motorhome camping, and tiny residences, but their use on boats has been steadily expanding for years.