There are numerous real world, and practical applications for all types of solar chargers. For most foldable solar chargers, their primary use is to charge small electronic devices, such as cell phones, mp3 players, PDA's, and cameras. A solar panel on these devices collect solar energy and rays from the sun and are ideal when heading outdoors for such activities as camping, hiking or just being out in the country. The fact that most solar battery chargers are portable and easy to carry around makes them especially suited for survivial conditions.
A trickle charger is a different type of solar charger that is usually more suited for car, ATV, motorcycle and other types of vehicles. For example, these are much more suited to charging a 12V car battery, and comes in very handy if finding a service station proves to be difficult. Trickle chargers charge batteries very slowly (at the self discharge rate), and the battery can stay attached to the solar trickle charger forever without overcharging.
Small wind generators are rotating machines that have rotating components which convert the kinetic energy in wind into mechanical energy. These wind generators are very useful for generating power to cottages and small homes that are not hooked up to an electrical grid. A wind generator is ideal for powering home appliances (such as fridge, microwave, dishwasher), as well as electronics such as 12V batteries, sump pumps, radios, tv's, computers, stereos, vacuum cleaners, DVD/VCR players, cell phone chargers and many more.