Solar energy system is officially named Photovoltaic System or PV system. It is designed to supply usable solar power by means of photovoltaics. Briefly it consists of several components, including solar panels to absorb and convert sunlight into electricity. And then it has a solar inverter to convert the output from direct to alternating current or it combines power inverter with solar charge controller. Of course, another important part is solar battery, including lead acid or lithium battery, as the energy storage tool. Mounting system, cabling as well as other electrical accessories are also needed to set up a solar power system. Sometimes, solar tracking system is used in one system to improve its overall performance.
Traditionally, PV system ranges from small, rooftop-mounted or building-integrated systems with capacities from a few to several tens of kilowatts, to large utility-scale power solutions of hundreds of megawatts.
Nowadays, most PV systems are grid-tied, while in this article, off-grid or stand-alone systems are in major part to be discussed and mostly welcomed in the market for remote areas, for houses, for example, solar power system 5kw is popular, in countries that have less stable utility grid.