Solar panels:

Solar panels solar power generation system is the core of most valuable part of the solar power system. Its role is to project the Sun's radiation into electricity, or to a battery store, or promote the work load

Solar controller:

Solar controller role is to control the State of the whole system, and played a battery charge, over discharge protection role. In difference places, qualified controller should have temperature compensation function. Other additional features such as light control switches, switch should be optional controller

Batteries:

Generally maintenance-free lead-acid batteries, small systems, you can also use nickel-metal hydride batteries, nickel-cadmium batteries or lithium batteries. Which is light emitted by solar panel power stored into back when released