4 MAY 2022

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Anti-spill systems; when is one needed?

Anti-spill systems

Since the sun tax was repealed in 2018 and solar self-consumption began to gain a foothold in the market as a way to save and be sustainable, new ways of self-consumption have been developed. For example, the compensation of surpluses, which was a great advantage, as people began to consider selling surplus energy to the electricity market.

The solar self-consumption modality under surplus compensation allows your installation to return to the grid the energy that you generate, but do not spend. When you contract an installation with these characteristics, the monetary value equivalent to the energy fed back into the grid is credited to your bill. In many cases, when energy generation is greater than 15KW and the surplus energy available is considerable, it is recommended to take advantage of the surplus compensation; although it is true that this is not always the case.

Another type of solar self-consumption installation is off-grid. In some cases, consumers decide to isolate their installation completely from the grid and prefer to plan a battery system that allows them to be completely supplied by the energy they generate themselves. In other cases, they may try to dimension the installation in such a way that it adapts as much as possible to their needs and does not lack or surplus anything.

However, it is also possible that an installation is connected to the grid and, despite this, does not want the surplus electricity to be fed into the grid. These systems are called self-consumption systems with surplus electricity without compensation. They only require an access and connection permit and save the generation tax and the grid access charge for surplus energy. This simplifies procedures and speeds up project implementation times. However, in order to take advantage of this modality, an anti-discharge system must be installed.


What is an anti-spill system?

An anti-spill system is a device that must be integrated into the dynamic controller of the installation and must also include an inverter in order to control the surplus production and ensure that it is zero, so that it cannot be fed back into the grid.

In short, what this system tries to do is to balance the production of energy to the needs of the consumer, acting on the inverter so that, in the event that we are not consuming all the energy we generate, it reduces the solar energy extracted.

Moreover, this type of system is not only used in self-consumption installations for private individuals, but there are photovoltaic plants that also regulate their solar energy production according to the needs of their customers and therefore have anti-diversion systems in the same way. In fact, the largest system in Spain is located in Badajoz in a plant with an installed capacity of 8 MWP.

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