We design and construct plants for the production of energy from renewable sources and realize energy saving measures in both processes and buildings. We perform technical consultancy for companies and businesses who wish to obtain the certification of obtained savings or energy produced (white and green certifications).  We provide consultancies, assessments, projects, studies and we work directly in the following areas:

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Design, installation, testing and certification of the photovoltaic system

EQUA designs and builds, tests and certifies solar photovoltaic systems of a wide range of powers and types of laws; it also deals with managing the request for  incentives read, the energy exchange / sale regime and, if required, the tax regularization at the U.T.F. read Photovoltaics pays off

EQUA carries out specific planning and carrying out activities for the construction of photovoltaic solar systems. We turn to builders and installers who wish to be supported in these complex and complex bureaucratic activities. read

Whatever your needs and whatever type of roof or surface to cover, we have the solution, because we have already done it! read To see some of our plants go to the reference page.

A photovoltaic system is now convenient even without incentive, read, in fact it will produce electricity for the next 25 years at least, at a fixed and predetermined cost, without undergoing a continuous increase in cost [cropping] the grid parity has now been reached.


EQUA Srl makes the safety of its customers and workers a priority. In collaboration with L’Isola che c’e ‘and the Università Insubria has prepared and published the guide: “Safety in the Installation of Photovoltaic Plants, Guide for Owners and Installers, together for safe work.” view and download it here.

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How it works and how much a photovoltaic system produces

schema di funzionamento della produzione fotovoltaico

The photovoltaic system works completely automatically:

using solar radiation incidents on the earth that are worth about 1000 W / m2 under “standard” conditions of good insolation, thanks to the particular semiconductor materials, such as silicon, the energy contained in the light rays is converted directly into electricity, from the so called photovoltaic cells. Several cells connected together form a photovoltaic solar panel. With more photovoltaic panels we build a string and with more strings we build a solar system see

once the minimum solar radiation threshold is reached, the modules produce energy and the convertor is activated, adapting it for domestic use, with the automatic tracking of the maximum power point that can be supplied by the modules.

The energy produced is fed into the building’s electrical system and consumed by users.

The part of energy produced that exceeds consumption then passes to the distribution network.

The two meters installed by the distribution network manager will take into account the energy flows, in withdrawal and in input.

The static converter will store the production data that can be downloaded to a personal computer via the diagnostic interface.

Through the remote monitoring portal it is possible to verify the production allows the verification of the correct functioning of the system and the storage and display of statistics on the operation of the plant.

Other informations

producibilità in funzione al posizionamento dei moduli

Production based on module placement:

The production of photovoltaic panels depends on their exposure to the sun.

As shown in the image, the most favorable position for the modules is towards the south with an inclination of 30 ° from the ground, but there is a very high level of production even positioning them with a lower inclination.

With east-west exposure, production is reduced by around 10%.

stima di producibilità impianto FV grafico

Reported example of a 3kWp plant in northern Italy.

stima di producibilità impianto FV tabella

Estimation of producibility based on the season:

In addition to their position, the production of photovoltaic panels also depends on the time of year. Obviously, in the months in which the climate is more favorable, such as May, June, July and August, energy production will be higher.

Instead in the coldest months, such as December, January and February, production will be lower as the sun is present for fewer hours and is lower in the sky than is often covered.

Reported example of a 3kWp plant in northern Italy.

The advantages of photovoltaics

CLEAN ENERGY: with photovoltaics reduce the emission of carbon dioxide, the main cause of the greenhouse effect ADVANTAGEOUS INVESTMENT: with a photovoltaic system your property will increase significantly in value SAVINGS: immediately generates savings in the bill, also ensuring a fixed price for energy for at least 25 years FISCAL FACILITATION: with a photovoltaic system you can enjoy a 50% deduction spread in 10 equal annual installments, therefore, after 10 years half of the plant cost including VAT will be returned RESPONSIBLE ETHICAL CHOICE: using solar energy you will help reduce our country’s dependence on foreign countries and reduce the exploitation of natural resources in many countries SELF-CONSUMPTION: use of the electricity generated by your plant at the moment it is produced EXCHANGE ON SITE: sell the energy you produce and do not use at GSE

Trademarks treated

EQUA srl is a qualified and certified installer of Solaredge.


EQUA srl is a service partner of Fronius.


EQUA srl is a qualified installer of LG.


EQUA srl is a qualified installer of Viessmann.


EQUA srl is a qualified and certified installer of Panasonic.




Plant over 20 KW: technical finance office

The electricity produced by a photovoltaic system greater than 20kw falls within the field of application of the tax regime in force on electricity (regulated by Title II of the Consolidated Law approved with Legislative Decree 26/10/1995, No. 504, amended by 26 of February 2, 2007 regarding excise duty and article 6 of DL 28/11/1988, No. 511, converted with amendments by law 27/1/1989, No. 20, most recently amended by article 5 of the same Legislative Decree 26/07, for what concerns the municipal and provincial surcharge). Therefore, pursuant to art. 53 of the aforementioned Consolidated Law, the subject that intends to exercise this production workshop (for its own use) must report it to the Customs Office, competent for the area, which carries out the verification of the plant and issues the operating license, subject to payment of an annual fee to the extent indicated in the art. 63, paragraph 3, of the Consolidated Law. If instead the subject intends to exercise a production workshop for commercial purposes, in place of the complaint it is provided, pursuant to art. 53 bis, the communication to the same Office, except that there are no consumptions for own use of the same producer even if exempt. The aforementioned Office, to which request the forms, may determine, in relation to the type of system and the use of electricity, the payment methods, if due, and the related obligations. Notwithstanding that the excise duty and the surcharge are due both if the electricity is supplied to the final consumer and if it is consumed by the same manufacturer. In general, it should be noted that the tax rates are shown in Annex I of the Consolidated Law, the benefits are listed in art. 52, again of the Consolidated Law. The current rates and facilities for the municipal and provincial surcharge are indicated in the aforementioned art. 6 of the Legislative Decree 511/1988. For further clarifications, contact the territorially competent Customs Office. Read For photovoltaic systems with on-site exchange or any other form of self-consumption, with a power exceeding 20kW, for which it was therefore necessary to open an “electrical workshop”, the annual communication of production and self-consumption data to the Revenue Agency is mandatory. read. EQUA srl manages the electronic file necessary for the annual communication of production and self-consumption data to the Revenue Agency. It manages the practice from the connection request with UTF certified meters to the preparation and control of the successful outcome of the communication.