Solar battery FAQs

A solar battery stores the electricity your panels produce that you do not use at the time, so you can use it at night or when production is low. It is connected to your solar panel installation through a hybrid inverter, which decides at every moment whether the energy goes to your home, to the battery or to the grid.

It depends on when you use your electricity. In a home without a battery, between 35% and 50% of what the panels produce is used directly; if your consumption is concentrated in the evening and at night, a battery lets you use much more of your own energy.

In return, it increases the initial investment and extends the payback period by around 2-3 years. We explain it with figures in how many years it takes for solar panels to pay for themselves.

A physical battery is a unit installed in your home that stores real energy. A virtual battery does not store electricity: it is a credit on your bill for the surplus you export to the grid, which is deducted from your later consumption.

They are compatible, and the best option depends on your consumption and your tariff. Check our electricity tariffs for self-consumption.

It is calculated from your night-time consumption, the power of your panels and the surplus you generate during the day. A battery that is too small falls short and one that is too large never fully charges, so it should be sized using real consumption data.

Many units are modular and allow you to expand capacity later on. Request your free assessment and we will work it out with you.

Not always. For safety reasons, a grid-connected installation disconnects when the grid goes down, and a battery alone does not prevent this. To keep the lights on you need a hybrid inverter with a backup function and a system that isolates your home from the grid, known as a backup box.

We explain all the details in what happens to solar panels in a blackout.

Yes, in most cases. If your inverter is a hybrid, you simply connect a compatible battery; if it is not, the inverter can be replaced or a dedicated battery unit added. We review your installation and propose the simplest solution.

You can see installations with batteries in our projects.

Today most home batteries are lithium, mainly lithium iron phosphate (LFP), because of their safety, long service life and good performance. They are usually modular, take up little space and are managed from the same app as the rest of the installation.

Its service life depends on the number of charge and discharge cycles, the temperature and how it is used. Today's lithium batteries are designed to work for many years with a gradual loss of capacity. Before installation we inform you of the warranty for each unit.

It is installed near the inverter, in a dry, ventilated place protected from direct sunlight, such as a garage, a utility room or a plant room. It takes up little space and can be wall-mounted or floor-standing, depending on the model.

In very hot areas, such as much of Andalusia and the Region of Murcia, the location is important to protect its performance and lifespan.

Practically none. The battery management system controls charging, discharging and temperature automatically, and you can monitor its status from the app.

What is worth doing is looking after the rest of the installation: here we explain how to clean dust and calima off your solar panels.

Yes. Home batteries include protection systems against overcharging, short circuits and overheating, and lithium iron phosphate chemistry is particularly stable. The important thing is that the equipment is certified and installed by a specialist company in line with regulations.

Yes, although it is usually most efficient to charge the car directly from your panels' production during the day and keep the battery for your home's consumption. If you charge at night, this must be taken into account when sizing the installation.

We look at it in detail in how many solar panels I need for my home and my electric car.

Yes, and it is a very attractive combination: a battery allows your air-source heat pump to run on solar energy even when the sun is not shining, for example for heating or hot water first thing in the morning.

Find more answers in our frequently asked questions about air-source heat pumps.

Grants and tax benefits for self-consumption and storage change depending on the call for applications, the autonomous community and the municipality. At SolQuality we inform you of those available in your case and take care of the paperwork.

For reference, see the guide to solar self-consumption subsidies in 2026 and the personal income tax (IRPF) deduction for installing solar panels.

Yes, we offer flexible financing both for new installations with a battery and for adding a battery to an existing installation.

Request your free quote and, if you still have questions, check our frequently asked questions about solar panels.