Among the various types of possible photovoltaic plants, two configurations are selected by JSA Energy for the needs of its electricity production activity.
The grid-connected photovoltaic solar plant
 A grid-connected photovoltaic solar plant is a system of which the photovoltaic field's production is directly connected to the traditional electricity provider's network, by means of continuous-alternate current converters.
A network injection photovoltaic generator simply overlaps the usual electric installation.
Both systems (photovoltaic and traditional public electricity supplier) operate independently. However, the traditional electricity supply company is closely involved in the project. Electricity produced by the solar plant is immediately injected into the public network.
After production of the energy by the photovoltaic modules,
>it passes through a grid-feeding inverter in order to be transformed, from direct current to alternating
current.
>the voltage produced by the photovoltaic cells is then measured, before injection into the public grid.
This measuring step is necessary for its accurate resale to EDF.
>a non consumption meter avoids consumption of the energy produced.
The grid-connected photovoltaic plant can either be building integrated (facade or roof), or simply imposed (added on the building). In cases of building integration, additional costs can be minimal, according to the case
The grid-connected photovoltaic solar plant + backup
 This network injection photovoltaic generator is slightly different from the previous one. This one is often named « hybrid ». When needed, it brings the necessary autonomy and independence to the buildings on which it is installed.
It is a grid-connected photovoltaic plant that presents the technical ability to feed the user with electricity, in case of traditional electricity supply interruption.
After production of the energy by the photovoltaic modules,
>it passes through a grid-feeding inverter in order to be transformed, from direct current to alternating
current.
>part of the voltage produced is diverted either for immediate consumption (in case of a diurnal power
cut), or towards the electricity storage devices, by transiting through à charger inverter.
>the other part of the voltage produced by the photovoltaic cells goes through the typical consumption
meter and is then measured, before injection into the public grid. This measuring step is necessary for
its accurate resale to EDF.
>a non consumption meter avoids consumption of the energy produced.
It is interesting to notice that the need to be backed up in case of traditional network failures is mostly satisfied by adding power generator, which feeds on diesel. Solar energy technologies nevertheless provide solutions that allow satisfaction of the same need, with no CO2 generation/emissions, silently and without using fossil fuels.
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