An inverter converts DC to AC, and also changes the voltage. In other words, it is a power adapter.
A charge controller limits the rate at which electric current is added to or drawn from electric batteries.
A sun-facing collector heats a working fluid that passes into a storage system for later use.
A solar AC unit is an apparatus dependent entirely on the sun's thermal energy to produce cooling system.
A solar water pump is a pump running on electricity generated by photovoltaic panels.
Solar street lights are raised light sources which are powered by photovoltaic panels.