27 marzo, 2019 0 By admin

Thanks to photovoltaic accumulators, you can maximize the performance of your system. Find out which one to choose and how to save on installation.

How much do photovoltaic batteries cost?

The photovoltaic accumulators are battery systems. They allow you to store the surplus electricity produced by your system during periods of maximum productivity and make it available when necessary. Therefore, they solve one of the fundamental problems of solar panels: the discontinuous supply of energy. In the following table you will find the indicative price of the installation and that of the individual elements.

Elements to consider price
batteries € 2,500 – € 5,000
Investors and other electronic components. 400 – 500 €
Additional services 950 – 2,000 €

Keep in mind that the cost depends mainly on the type of batteries you decide to use, be it lead or lithium and the power needed for  your photovoltaic system  .

Do you want to learn more about photovoltaic batteries?

If you have decided to install a photovoltaic system equipped with a system to conserve the energy produced in excess, the first step is to get in touch with the professionals of the sector. 

How do accumulators work?

This is a fairly recent technology, until a few years ago, the excess energy could only be recovered through the exchange on the site, or by entering the percentage that was not used in the electricity network. Currently, thanks to this  energy storage system  , it can be stored and consumed when necessary. 
Domestic storage systems, therefore, allow you to increase self-consumption, reducing withdrawals from the network at peak times and saving more on your bill. 
In addition, you can install them without losing the incentives you received  for the solar panels  .

Accumulators vs UPS

These accumulators should not be confused with the UPS or the UPS, which instead keeps the electrical and photovoltaic devices constantly powered. 
They are always  photovoltaic batteries    that are activated only in emergency situations, to avoid the interruption of the current guaranteeing the continuity of the energy. 
If you want a standardized accumulation system, you should only install them with the CEI 0-21 certification connected to the electrical network.
According to the legislation, it is defined as a photovoltaic accumulator, the set of devices, equipment and logic management and control, functional to absorb and release electricity. It is in continuous operation, in parallel with the normal network, with the obligation to connect to third parties or may involve an exchange operation with the electricity network. 
In summary, UPS systems can not be used as accumulators because they are designed only for emergencies and are not designed to operate continuously.

Which to choose?

There are three ways to install storage systems:

  • production side: the batteries and the control system are located between the panels and the inverter, on the DC side;
  • postproduction: the batteries are placed after the meter (on the side of the alternating current). These are kits added to the system without modifying the operation of the inverter;
  •  Bidirectional postproduction: batteries can also be charged through traditional energy. Most systems can only work with photovoltaic panels and, therefore, are unidirectional.

Systems inside and outside the network 

Despite this, the accumulation can still supply power to the electricity grid. 
The systems can, in fact, be in the network, therefore, connected to the current through a separate kit, formed by a control system and integrated or independent batteries. 
The systems outside the network, on the other hand, are called “autonomous” systems because they do not feed the current produced, which will only go to the batteries. Once loaded, production stops.

What characteristics to evaluate?

To choose the right type of storage, consider the size and type of photovoltaic batteries above all else. They should be sized correctly according to the energy you need. 
Calculates that the average electricity requirement of a family is approximately 3000 kWh / year, so approximately 8.2 kWh / day, considering that 50% of the consumption occurs during the night, the batteries should guarantee approximately 4 kWh per day to reduce Significant consumption


The advantages of the storage system.

From an economic point of view, the combination of an accumulation system with an existing photovoltaic system allows you to return the initial expenses in an acceptable time, only 6 years if your system is 5 kWh and 10 years for those of 3 kWh. 
In this way, the production of the photovoltaic system increases by 50-80% in optimal cases. The percentage reached depends on the size of the photovoltaic system, its consumption and the batteries chosen. 
Also for the insertion of an eventual accumulation system, until December 31, 2017, you can take advantage, as in any other building renovation, of tax deductions of 50% in 10 years.
The use of energy storage is still relatively young in Italy, but if the product is of adequate size and combined with an intelligent management system, it can generate good savings over time, even without incentives.