Advantages and properties of energy storage

The battery connected to the solar system is an energy storage device that stores unused electrical energy from the solar system for later (typically intraday) use. The solar battery makes it possible the use of previously produced electricity even when the sun is not shining, and with the right accessories it covers the energy demand even when the electricity in our home goes out.

What are the advantages of energy storage?

Batteries allow us to get the most out of our solar system, so that none of the energy produced goes to waste. Basically, the energy storage complements our existing solar system equipped with a hybrid inverter, but if necessary or in case of this kind of demand, we can even completely independent ourselves from the energy provider, which results in a so-called island operation system. Although the investment cost of this is currently very high. Typically, the need to install a solar cell battery arises in a place where network problems and power outages are common, so the energy can be provided from the battery until the service is restored.

Who is recommended to install a solar battery now and in the future?

Currently, there are two cases where energy storage is installed. On the one hand, in places where it is not possible or too expensive to build a network connection, the creation of an isolated system is a reasonable alternative. On the other hand, it is worth thinking about building in places where power outages are frequent and critical consumers (e.g. refrigerators, heating systems, hot water generating systems, computer technology/defense/communication equipment) are left without supply because of this - thus even causing further damage. In this case, in addition to the security of comfort, the investment may even pay off financially.

In the future, if the balance settlement is terminated and both the consumed and supplied energy will be accounted for separately, then there may be financial circumstances that make it worthwhile to consider the installation of an energy storage. Given that residential solar systems typically feed approximately two-thirds of the energy produced into the utility grid, the energy fed into the grid can even be fed into the battery and used later (typically in the evening) if it is more worthwhile. If the price of the energy purchased later would be high, then storing the cheap electricity produced during the day for the evening can improve the profitability of a battery storage. It is also conceivable that a tariff system will be introduced in the future that will even use financial means to encourage solar panel system owners to install energy storage in order to support the activation of other regulatory capabilities in the network.

What technical characteristics should we choose for a battery?

Each type of battery has its advantages and disadvantages. That's why it's important to consider five key factors when choosing a solar battery.

  • Battery size, which is given in kilowatt-hours (kWh): residential batteries generally range in size from 2 kWh to 20 kWh.
  • Efficiency: We must take into account how much of the stored electricity we can later use as a percentage. Simply put, how many kWh are lost when the system converts from direct current (DC) to alternating current (AC) or when electricity is stored in the battery. The higher the efficiency, the lower the energy loss during storage. Usually this is around 80%.
  • One of the most important factors when choosing a solar battery is the depth of discharge (DoD Depth of Discharge), which refers to the amount of energy that can be used from the system. Let's say we have a battery with a capacity of 8 kWh and its DoD is 80%. This means that we can use a maximum of 6.4 kWh.
  • Lifetime of solar batteries. This is expressed in years, and their lifespan is expected to exceed 10 years. They do not need to be serviced or replaced often. They remain functional even after thousands of charging and discharging processes.
  • Safety: Batteries are considered very safe, the risk for home use is the same as for home use of mobile phones or laptops.

However, all batteries must meet certain safety requirements to be approved for residential and commercial use.

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