Solar Battery Installation for Photovoltaic Panels

A solar battery lets you use the energy your panels generate at night and when the grid fails. At Fotovol we are certified installers for the leading manufacturers on the market – Victron Energy, Tesla Powerwall, SolarEdge and Fronius – which allows us to select the system that best fits your existing installation and real consumption profile.

Before every installation we carry out a personalised study where we analyse your real consumption, your current inverter and your objectives – night-time autonomy, UPS or peak reduction. This allows us to size the right battery and guarantee maximum performance from day one.

Coneix tots els avantatges d'instal·lar bateries solars en un sistema fotovoltaic, i maximitza l'ús de l'energia solar.

Every home or business has a different consumption profile. Before recommending any system, we analyse your specific case to size the real capacity you need — no more, no less. These are the most common profiles we size at Fotovol:

Standard home: Night-time consumption of 4-6 kWh and moderate peaks. 48V lithium battery with integrated UPS function. Sufficient autonomy for a full night without grid power without oversizing the investment.
Home with electric vehicle: High night-time consumption due to car charging. Scalable lithium battery with advanced monitoring to manage charging priorities — home first, vehicle second.
Business or industrial installation: Service continuity during grid outages and reduction of demand peaks. Three-phase UPS with modular integration according to contracted power and the activity’s consumption profile.

Want to know what capacity you need? Tell us about your case and we will prepare a free no-obligation sizing within 48 hours.

Our process guarantees the system works correctly from day one, whether you already have solar panels installed or are installing them for the first time.

Personalised study: We analyse your real consumption, contracted power, current inverter and objectives — night-time autonomy, UPS or peak reduction. Without this prior analysis it is not possible to size correctly.
Sizing: We define the useful battery capacity and real autonomy according to your consumption profile. We select the most suitable system and brand for your existing or new installation.
Certified installation: Professional assembly, connection to the existing or new inverter and complete backup tests. All our technicians are certified by the manufacturers we install.
Commissioning: System configuration, UPS operation verification and activation of real-time monitoring.
Maintenance and warranty: Periodic inspections and direct processing with the manufacturer in case of incident. No intermediaries, no bureaucracy for the client.

The solar battery systems we install incorporate advanced energy management functions that go far beyond simple storage. We work with the leading manufacturers on the market — Victron Energy, Tesla Powerwall, SolarEdge and Fronius — selecting in each case the system most compatible with your installation and consumption profile.

- Automatic priority management: Solar first, battery second, grid only if necessary. The system automatically manages the energy flow to maximise self-consumption at all times.
- UPS mode — instant switchover: In case of grid outage, the system automatically switches to battery in milliseconds. No interruptions, no loss of connected equipment, no manual intervention.
- Real-time monitoring: Full control from app or web. You can see at any time how much you produce, how much you consume, your battery charge status and how much you are saving.
- Performance alerts: The system automatically detects any deviation from expected performance and notifies you before it becomes a problem.
- Compatible with electric vehicle chargers: Intelligent management of solar surplus to prioritise electric vehicle charging when the home battery is already fully charged.
- Modular and expandable systems: From 3 kWh to more than 15 kWh. You can start with a basic capacity and expand without changing the system when you need to.

Solar battery installation can benefit from specific grants that significantly reduce the initial investment. In 2026, tax deductions, municipal bonuses and regional programmes remain active, making solar storage more accessible than ever.

Income tax deduction (IRPF): Between 20% and 60% of the investment for combined solar panel and battery installations, valid until 31 December 2026.
Regional grants: Specific programmes for battery storage in self-consumption installations. In many cases batteries have independent grant lines separate from the panels.
Municipal IBI and ICIO bonuses: Discounts on local taxes depending on the municipality where the installation is carried out.

Check all specific grants for solar batteries in our solar panel grants guide.

Frequently asked questions about solar battery installation

Can I install a battery if I already have solar panels from another company?

Yes. We install batteries on existing photovoltaic installations regardless of who installed them. Before quoting we analyse your current inverter to determine the most efficient connection architecture — AC-Coupling or DC-Coupling — and select the battery system most compatible with your installation.

How long do lithium batteries last?

The lithium batteries we install have a useful life of more than 6,000 charge cycles with a depth of discharge of 90%. In normal domestic use, this is equivalent to more than 15 years of operation. Degradation is minimal and predictable, so you can plan your return on investment with real data.

What happens to my batteries during a power cut?

It depends on the installed system. With the UPS function activated, the switchover to battery is instantaneous — in milliseconds — without any connected equipment switching off. Without UPS, the system disconnects from the grid but can continue managing the solar energy generated. At Fotovol we size the system according to your real continuity of supply needs.

Tell us about your project

Free quote · No obligation · We respond within 24 hours