From Solar Plants
On-grid photovoltaic systems, function either as a power plant with a large amount of photovoltaic panels, giving back captured energy to the power grid or as a building integrated systems. In the latter case, the aim of the system is to power buildings connected to the grid, where the energy is taken from the grid only if the energy demand is greater than energy production from photovoltaic cells. These systems are connected to the grid through the inverter, but there is no need for batteries and charge controllers, because the network is able to absorb all the energy produced by the photovoltaic system.s superior quality, and its quick and easy installation without roof penetration.
Grid – integrated photovoltaic generators have the greatest potential for reach high efficiencies and performance indexes, as all the energy they produce, can be used either on site or transferred to the power grid. Well-controlled system that works with high efficiency inverter can achieve efficiencies greater than 80% (the equivalent capacity of more than 800 - 1300 kWh / kWp / year).
System performance is dependent on the level of solar radiation falling onto a set of PV modules. For optimal operation of PV, systems should be designed in the proper way, using computer programs. This would allow to adjust the expected year and day load profile, to the average solar radiation in the area. The development of such programs is needed in order to determine the optimal size of a set of modules and a proper selection of components that make up a complete system.
The PV system consists of the following elements:
- Photovoltaic panels,
- Counter of energy produced by the photovoltaic system.