Adding Photovoltaic Panels to an Existing System: How to Do It?

Solar Energy is at the center of a Revolution in Energy Supply, representing a sustainable and advantageous solution for many families and businesses. The installation of photovoltaic panels allows you to access various advantages, but is it possible to multiply the benefits and add Photovoltaic Panels to an Existing System? 

This article explores the important details and considerations to keep in mind when you want to upgrade your system with the addition of Solar Panels. Furthermore, the procedures to be followed are identified based on the type of system and the factors that influence the intervention costs.

Can Photovoltaic Panels be Added?

Photovoltaic systems represent an important step towards energy sustainability, allowing you to increase the level of energy independence and achieve significant savings on your bill. 

Can Photovoltaic Panels be Added?

Those who already own and use Photovoltaic Systems know that the advantages of renewable energy are numerous. Naturally, the more extensive and powerful a system is, the more it allows you to enjoy these advantages. For this reason, it may happen that you install a Photovoltaic System on your roof and then decide to expand it. But is it possible to add Photovoltaic Panels to your System to Increase its Power? 

In General, yes, it is possible to add a Photovoltaic Panel (or more) to a Pre-existing Energy System. However, before carrying out this operation it is good to take the following factors into consideration:

  • Available Space: Firstly, it is important to ensure that the roof on which you want to add photovoltaic panels is adequate in terms of space, orientation, and inclination.
  • Authorizations: It is essential to carry out a consultation with the relevant municipal office in order to identify the necessary authorizations for the additional installation of photovoltaic panels on the roof. In particular, it is crucial to ensure that there are no historical or landscape restrictions that could limit the area available for the installation of solar modules.
  • Electricity Network: It is essential to know the capacity of the public network to know if it is able to support the additional power generated by the photovoltaic system. Generally, if the power increase does not exceed 2-3kW, no particular problems are encountered. Furthermore, it is important to underline that above 6kW of power, it is mandatory to install a three-phase inverter.

Finally, it is advisable to carefully evaluate the reasons why you want to expand the system: if the components of the Photovoltaic System are obsolete or have suffered a significant loss of efficiency, revamping or replacement of inefficient parts could be more cost-effective compared to adding new photovoltaic panels.

How to Add Photovoltaic Panels to an Existing System

If you want to add Photovoltaic Panels to an existing system, the procedure to follow varies depending on the type of system. In particular, the GSE distinguishes between plants incentivized in the Energy Account and plants not incentivized:

Systems Incentivized Under the Energy Account: 

If the photovoltaic system benefits from the incentives of the Energy Account, its expansion is not permitted due to the exhaustion of available resources. However, if you still want to expand your energy production capacity, you can install a new photovoltaic system that is completely independent of the one benefiting from the incentives. Even if connected to the same exchange meter, the new photovoltaic modules must be connected to a new inverter equipped with a separate and distinct meter compared to the incentivized system. This is necessary to allow GSE to monitor both plants and ensure that there is no interference between them.

Non-Incentivized Systems:  

To expand a photovoltaic system built without the Energy Account mechanism, simply contact a professional who, after having verified the necessary specifications with the Municipality, will submit a connection request to the electricity grid manager. As for the practical aspects, there are two options: first, you can add new solar modules by connecting them to a new inverter, effectively creating two separate photovoltaic systems that remain connected to the electricity system. 

Alternatively, you can opt to replace the existing inverter with a more powerful one, creating a single unified system. Installing a new inverter offers the advantage of taking advantage of newer technologies, such as monitoring software that allows you to manage the entire system via a mobile application, an option that may not be available for older inverters.

In general, for the expansion of Photovoltaic Systems, it is advisable to turn to professionals, who are able to evaluate the possibilities and identify the most suitable solution based on the type of system, the available space, and the specific situation.

How Much does it Cost to add 1kW of Photovoltaic Panels?

Once the answer to the question “Can I Add Photovoltaic Panels to My Photovoltaic System?” has been identified, another question arises spontaneously: how much does it cost to expand the system? The cost of adding 1 kW of Photovoltaic Panels can vary greatly based on several factors, including: 

Quality and Type of Solar Panels:  

High-Quality Solar Panels, although they offer higher efficiency and longer life, tend to be more expensive;

Installation Costs: 

Installation Costs may vary depending on the complexity of the project, access to the roof, and the distance between the Solar Panels and the Inverter.

Incentives and Benefits: 

In most cases, for the addition of Photovoltaic Panels, it is possible to access state incentives in the form of tax deductions.

Possible Cost of the Inverter: 

If it is necessary to add or modify the inverter, the costs of this component must also be taken into consideration.


In conclusion, to evaluate the addition of Photovoltaic Panels to an Existing System it is necessary to take into consideration some key aspects. The procedure to follow, in fact, varies based on the type of starting system, with distinctions between those incentivized in the Energy Account and those not incentivized. Finally, plant expansion requires careful planning and cost evaluation. 

Sorgenia, an established company in the energy services supply sector, offers solutions for the production and supply of energy from renewable sources. The company is committed to promoting sustainability and supporting customers in the transition to a more sustainable energy supply. Thanks to its vast experience, Sorgenia represents a reliable partner for all those who wish to explore opportunities related to solar energy, including operations relating to the addition of photovoltaic panels to an existing system.