Concentrated photovoltaic (CPV) technology uses lenses or mirrors to concentrate the sunlight onto a small area of solar photovoltaic (PV) cells to generate electricity. Compared to non-concentrated photovoltaics, CPV systems can save money on the cost of the solar cells because a smaller area of photovoltaic material is required. CPV turns the sunlight directly into electricity, while solar thermal turns the sunlight into heat, and then turns the heat into electricity.The two technologies can sometimes be combined for achieve a greater efficiency.Solar photovoltaic is based on the photovoltaic effect.
In this system renewable electricity is fed directly into the properties power supply and use photovoltaic panels which are connected to the utility grid.
In Off grid systems the electricity produced by the photovoltaic panels cannot always be used directly. The mainly functions of a storage battery in an off-grid photovoltaic system are:
• Energy Storage Capacity and Autonomy: To store energy when there is an excess and to provide it when required.
• Voltage and Current Stabilization: To provide stable current and voltage by eradicating transients.Supply Surge Currents: to provide surge currents to loads when required.