Standalone installation

The autonomous photovoltaic systems are indicated in case of absence of connection to the electric network.

Isolated photovoltaic systems must always be sized based on the following factors:

  • the installation area
  • the period of use
  • the type of user (if in direct or alternating current)
  • the loads to be connected (eg lights, TV, radio, etc.).

Below we find out how the essential components of photovoltaic systems for isolated users are connected:

Photovoltaic solar modules: exposed to the sun generate electricity, in the form of direct current and voltage. Their number and the relative connections depend on the sizing performed.

Accumulation batteries: the energy from the solar modules is stored in them. Care must be taken to use specific batteries for photovoltaic systems, which are different from normal automotive batteries. The most suitable batteries are those with a positive tubular plate. The choice of the type and capacity of the battery (obviously related to the type of use) is very important for the life of the battery itself that can exceed even 10 years of life.

Solar control unit: regulates the charge and discharge of the batteries, which are the most critical element of the system. It is a bit the “brain” of the system, which manages the power supply from the modules (disconnecting the connection with the modules once the upper limit of the battery voltage has been reached) and the consumption of the utilities (disconnecting the utilities if the battery voltage falls below a certain minimum level, under which the accumulator would be damaged).

Inverter: it is an electronic device that transforms the voltage and current from continuous (as it arrives from the modules and how it is accumulated in the batteries) to alternating. In this way the user can have the normal freedom to use devices that require 220 Vac as it is usually in our homes.

The stand alone photovoltaic systems represent the best solution to overcome the lack of the electricity grid. Think of the Third World countries and the problems of energy supply for hospitals, schools and kindergartens, but also in isolated areas (in the mountains or in the countryside) not served by the national electricity grid. In these contexts, the isolated systems represent an optimal solution that is environmentally friendly.

Just a system equipped with a photovoltaic solar panel, a regulator and a battery to bring electricity to the most inaccessible areas. It is not by chance that these systems are widely used in the detection and data transmission stations (on the levels of watercourses, on the presence of fires, meteorological, radio links, etc.)