27 marzo, 2019 0 By admin

Have you ever thought about accumulating the excess energy produced by your photovoltaic system and reusing it when you need it? Thanks to the photovoltaic accumulation it is possible to store the energy produced and use it when necessary. Keep reading the article to learn more!

Accumulators: what they are and what they are for.

The photovoltaic system with storage (also called energy storage for the photovoltaic system) represents a real innovation in the field of alternative and “green” electricity production. 
Defining the exact price of each individual battery in the market is very difficult, since its value changes constantly and, in particular, is related to market changes, requests and the continuous launch of new models that replace the previous ones ( also at the price level). 
Despite this, the following table shows the indicative prices of the main photovoltaic batteries with storage in the market.

Photovoltaic batteries with accumulation. price
Lead – acid 2500 – 4000 €
With Nickel Cadmium 3000 – 5000 €
Nickel (metal – hydride) 3000 – 5000 €
Lithium ion 4000 – 6000 €

And your photovoltaic system?

Do you want to install a storage system that guarantees the best quality at the lowest price? Since the cost may vary from one company to another, it is advisable to evaluate different estimates.

Why build it?

The great limitation of  photovoltaic systems  , in fact, is the fact that solar radiation ceases at night, when energy needs are often greater. 
On the other hand, the photovoltaic accumulators store the surplus of electricity produced by the photovoltaic system during the day and make it immediately available when necessary: ​​at night, at night or early in the morning. 
The excess production that would otherwise be discharged into the network is stored by the batteries and is used at those times when there is no production.
If during the day your family spends many hours away from home and the consumption of electricity is concentrated at night, the construction of a photovoltaic system with storage is, therefore, a convenient and intelligent option, which will cover up to 90% of the electricity needs. From your family with self-generated electricity.



The types of accumulators.

The main types of batteries are:

  • Lead – Acid (hermetic and with electrolyte gel);
  • with nickel cadmium;
  • Nickel (metal hydride);
  • lithium ion (for example, lithium and nickel oxide, lithium iron phosphate);
  • With high temperature technology.PHOTOVOLTAIC WITH STORAGE

Lead – Acid (hermetic and with electrolyte gel).

Being the most widespread in the market, they have an excellent quality / price ratio. However, they are very bulky and have a high specific weight.

With Nickel Cadmium

They can accumulate large amounts of energy even at low temperatures, but they have a low energy memory that does not allow large amounts of energy to accumulate.

Nickel (metal – hydride)

The storage capacity is three times higher than with nickel-cadmium batteries of the same size and has a lower volumetric density than lithium-ion batteries. They also have the advantage of having a long service life and very low maintenance costs. Unlike the previous ones, which generally contain 30% -40% energy, they can be downloaded almost completely.

Lithium ion (for example, lithium and nickel oxide, lithium iron phosphate)

They are extended and constantly evolving at a technological level; Compared to those with lead, they have a longer life but a decidedly higher cost.

With high temperature technology.

They are not very convenient due to the good value for money and, sometimes, they have some impediments to maintain the temperature (which must be kept constantly at 250 degrees).


The comfort of a photovoltaic system with storage.

With a photovoltaic system equipped with a battery, it is really possible to completely zero the energy component of the bill. 
Obviously, the percentage of savings depends to a large extent on the consumption habits of the family. By concentrating more consumption during the day (when the plant is in production and the battery is already charged) and at night, the accumulator can meet all the needs of the house, especially if the system is correct. dimensioned. In this way, we no longer obtain external sources and the energy component of the electricity bill is restored.

For example, a family with an annual consumption of 3500 kWh and a self-consumption of 75% can save about 750 euros a year, at the current price of electricity. With an accumulator, you no longer have to fear the increase in the price of electricity: the more you increase, the more you save!

Autonomous photovoltaic system

A photovoltaic system  with storage  lends itself very well to be installed in situations where there is no connection to the electricity grid (for example, mountain or country homes) or in the case where you want to be completely independent of any supplier .
This type of photovoltaic system with storage is also defined as independent (or outside the network or outside the network) since the plant is disconnected from the electricity grid and is self-sufficient. The accumulator guarantees the supply of electrical power even at night and at night, using clean energy and impact 0, provided that the battery is the correct size to meet all absorption requirements. Since there is no connection to the network, there are no fixed costs, network charges or other taxes to pay for the use of electricity in the home.