An autonomous system consists of solar panels, charge controller, battery and inverter for off-grid systems. Number of panels, batteries and inverter is chosen to power all the devices and their expected time of daily use. It should also specify days of autonomy, the days of very bad weather, when the production of electricity will be less.
The hybrid system is a variation of the autonomic system. It consists of photovoltaic panels backed with the power of the wind turbine or generator power. Such solutions are used in areas with less sunlight. Hybrid systems are often fed a stand-alone signs.