One of the key components of every solar system is the solar battery, a smart device that lets you store the energy you produce and use it when it's needed most. Saving the surplus and using the sun's energy smartly even when it's cloudy is exactly what this device is for.

In this article we'll explain in detail what a solar battery is, how it works, what types exist, and why it's so important for stable and sustainable electricity supply from renewable sources.

What is a solar battery?

A solar battery is an accumulator used to store the energy produced by solar panels. During the day, when lighting conditions are favourable, solar panels convert sunlight into electricity. However, energy produced during the day doesn't have to be used immediately, and this is exactly where the battery comes in, allowing you to store the surplus for later use, for example at night or during periods when sunlight is weaker.

In practical terms, solar batteries enable energy autonomy, meaning the user can have uninterrupted power supply even when not connected to the public electricity grid.

This is especially important for remote households, holiday homes, mountain properties, but also for urban users who want to reduce their dependence on the grid and save on electricity bills.

How does a solar battery work?

The solar battery's operation is part of a wider solar system that most often comprises the following components:

solar panels, produce electricity from sunlight
charge controller (solar controller), manages the battery charging process to prevent overcharging or complete discharge, which can damage the battery
solar battery, stores the produced electricity for later use
inverter, converts direct current (DC) into alternating current (AC), which is used to power standard household appliances

When the sun is shining, solar panels produce electricity that first passes through the charge controller. The controller then distributes the energy so that part goes directly to consumers, while the surplus is routed to the battery. When there is no electricity production, for example, at night, energy is drawn from the battery, ensuring continuity of supply.

What types of solar batteries exist?

There are several different types of solar batteries on the market today, and the choice depends on user needs, budget, and planned use:

Lead-acid batteries (classic and gel): have been on the market the longest. They have a more affordable price and are reliable for shorter charge and discharge cycles. Gel versions have the advantage of being sealed, requiring no maintenance, and being safer for household use.
Lithium-ion batteries: increasingly popular due to longer service life, greater efficiency, lower capacity loss, and faster charging. They have a higher price, but this is offset by long-term savings and better energy utilisation.
Lithium iron phosphate batteries (LiFePO4): an advanced version of lithium batteries with even greater safety and longevity. They are resistant to high temperatures, have more stable operation, and are often used in modern household solar systems.

Advantages of using solar batteries

Using solar batteries brings numerous advantages:

independence from the electricity grid, ideal for remote locations, holiday homes, or situations where power often goes out
reducing electricity costs, surplus energy accumulated during the day can be used in the evening, when electricity prices are usually higher
environmental sustainability, using solar energy reduces the need for fossil fuels and contributes to protecting the environment
reliability and safety, in case of a supply interruption, a solar system with a battery ensures continued operation of key household appliances

What to consider when choosing a battery

When choosing a solar battery, it's important to consider the following:

battery capacity, which depends on average daily electricity consumption
the number of charge and discharge cycles, the more cycles, the longer the battery life
charging and discharging speed, especially important for systems that require quick reactions
compatibility with existing system components, the inverter, charge controller, and panels
price and warranty, a good warranty can indicate the quality and durability of the product

Solar batteries are the essence of every off-grid or hybrid solar system. They enable storage of renewable energy, increase supply security, and open the door to greater energy independence. Whether you want power outside the city without grid connection, or a backup power supply in the city, a solar battery is a reliable solution that is being used more and more around the world.

At MySolar, we help you find the optimal solution for your energy system, from selecting quality solar panels and batteries, to complete installation and technical support.