Photovoltaics with storage: what it is, how it works, and why it is beneficial in 2025

In recent years, more and more families and businesses are choosing to invest in a photovoltaic system with storage. But what exactly is it? In simple words, it is a system that not only produces electricity thanks to solar panels but also stores it in dedicated batteries to be used when the sun is not shining. And it is precisely this ability to "store the sun" that is making storage a valuable ally for those seeking energy independence and savings on bills.

In a context marked by rising energy prices, sudden blackouts, and increasing attention to environmental sustainability, photovoltaic systems with storage represent a forward-thinking and concrete choice. Whether it is a single-family home, an isolated villa, or a small business, the ability to produce and manage energy independently is a real and tangible advantage.

How a system with panels and batteries works

A photovoltaic system with storage consists of solar panels, an inverter (which converts energy from direct current to alternating current), a management system, and, indeed, batteries. The latter allow for storing excess energy produced during the day for use in the evening or when the sky is overcast.

Unlike traditional systems that feed excess energy back into the grid, those with storage focus on self-sufficiency: the energy produced remains within the system as long as needed. This drastically reduces withdrawals from the national electricity grid and ensures greater stability in consumption.

Production, storage, and use of solar energy

The operation is quite simple and intuitive. During the day, solar panels capture the sun's energy and convert it into electricity. This energy directly powers household appliances. When production exceeds consumption, the surplus is stored in the batteries.

Once the sun sets or in case of bad weather, the storage system kicks in: the stored energy is used to continue powering the home. If the battery runs out, energy is drawn from the electricity grid, but only when absolutely necessary.

A hybrid inverter intelligently manages all these flows, ensuring maximum efficiency and prioritizing self-consumption.

The advantages of choosing a system with storage

1- Autonomy and independence

One of the main benefits is the possibility of becoming (almost) independent from the grid. In many situations, especially in well-insulated homes with optimized consumption, it is possible to cover up to 80% of energy needs with the photovoltaic system.

2- Savings on bills

By reducing withdrawals from the grid, it significantly lowers the costs of bills. Savings are tangible from the first years and, in the long run, more than recover the initial investment.

3- Service continuity

In the event of a blackout, some systems with backup function allow essential loads (lights, refrigerator, modem, etc.) to remain active even in the absence of the grid.

4- Sustainability

Using renewable energy reduces environmental impact and contributes to the fight against climate change. It is a concrete step towards a greener lifestyle.

Batteries: what to consider when choosing

The batteries are the heart of the storage system. The most common today are lithium batteries, valued for their efficiency, longevity, and compactness. Other technologies, such as lead-gel or LFP batteries, offer valid alternatives depending on the context.

To choose the right battery, one must consider:

• Capacity (kWh): how much energy it can store

• Depth of discharge (DoD): percentage of energy that is actually usable

• Number of cycles: how many times it can be charged and discharged before degrading

• Space and placement: preferably in cool and well-ventilated areas

A professional can help correctly size the battery based on consumption and the user's lifestyle.

How much does a system with panels and storage cost

The cost of a photovoltaic system with storage varies, but in 2025, a complete system for a medium-sized home (6 kWp with a 10 kWh battery) is estimated to be between 13,000 and 17,000 euros turnkey.

This initial investment may seem significant, but it should be evaluated in light of:

• the annual savings on bills

• the available incentives

• the increased property value

With proper sizing, the return on investment generally occurs in 7-9 years.

Tax benefits and incentives in 2025

In 2025, several incentive tools will be available:

• 50% tax deduction on the entire system, including the battery

• 10% reduced VAT for domestic systems

• 40% non-repayable grant for municipalities with fewer than 50,000 inhabitants

• Local or regional contributions vary depending on the territory

• Possibility of access to Renewable Energy Communities, with energy sharing models

Check with an expert or with the GSE (Manager of Energy Services) for updated opportunities in your municipality.

When is it advisable to install panels with batteries

A storage system is recommended when:

• Consumption is high in the evening and night hours

• The property is isolated or subject to blackouts

• You want to power a heat pump or a wallbox for electric vehicles

• You want an independent system that's ready for the future

In general, it is the ideal choice for those looking to optimize self-consumption and reduce dependence on the grid.

Add storage to an already installed system

Do you already have a photovoltaic system and want to add a battery? No problem. In many cases, it is possible to make a retrofit, that is, an upgrade to the already installed system.

However, it is necessary to verify:

• The type of inverter (it may be necessary to replace it with a hybrid one)

• The available space for the battery installation

• The permits or paperwork that need to be updated

A qualified installer can assess the situation and propose the most suitable solution.

Solar energy and electric mobility: a winning pair

Those who own an electric car can gain even more advantage from a system with storage. Charging the car with self-produced solar energy allows for lower costs and drastically reduces emissions.

Modern smart wallboxes allow scheduling of charging during the most convenient times. Additionally, emerging technologies such as V2H (Vehicle-to-Home) and V2G (Vehicle-to-Grid) open new scenarios where the car itself becomes a storage unit.

Real examples of residential and business systems

• Family in a villa: 6 kWp, 10 kWh battery, covering 75% of annual consumption

• Farm: 12 kWp, modular battery of 20 kWh, self-sufficiency for daytime machinery

• Off-grid cabin: hybrid system with panels, battery, and backup generator

• Smart home with electric vehicle: scheduled charging based on solar production

These cases show how each system can be customized to meet different needs.

How to choose the solution that best meets your needs

To make a good choice:

1. Analyze your real consumption (with bills in hand)

2. Evaluate the solar exposure of your roof

3. Ask for technical sizing from a professional

4. Check the available incentives in your area

5. Choose certified products and reliable installers

A well-designed system can last over 25 years and provide lasting economic and environmental benefits.

FAQ - Frequently Asked Questions

1. Can I use the energy stored during a blackout?

   
   Yes, if the system has a backup function.
   
   

2. Does the battery last even in winter?

   
   Yes, but solar production will be lower. Storage helps to compensate.
   
   

3. Is maintenance required?

   
   Minimal. Modern batteries are almost maintenance-free.
   
   

4. Can I install the panels first and then the battery?

   
   Of course. Many systems are designed for a future addition.

An intelligent and sustainable choice

Choosing photovoltaic with storage in 2025 means investing in a more efficient home, a sustainable future, and a lighter bill. Thanks to the combination of solar energy and smart batteries, it is possible to transform one’s home into an autonomous and smart energy system.

With the support of a qualified professional, it is possible to configure a customized system, access incentives, and start saving right away. Why wait? The sun is already above your roof, ready to work for you.