There are solar backup systems, which mainly consists of you getting power from the grid and this is achieved by solar power as well as other methods of alternate energy sources.  These are valuable in the event of an emergency and can be utilized in those instances, though it is not the only type of solar power system.  There also off-grid systems that will offer a generator backup if you should so happen to need it in the event of an emergency or periods of time when the sun has simply been behind the clouds for days at a time and your power supply is starting to run low.

As you can tell, there are many types of solar power systems, and this is simply just a couple of types, as there are more.  You have to take into account several factors as to what it is you need or want and decide from there.  So many factors such as your location, how much sunlight your property receives, they type you are considering, and much more need to go into the though process as to which type you should go with, or if you should go with any at all, though, you should know, all of these solar power systems are environmentally friendly and can help the quality of life that you and everyone else in the world will have due to the lack of emissions being let out into the world.