Questions about solar panels in Marbella, answered plainly

For a home, between about €1,000 and €1,500 for each kWp installed, IVA included. In round numbers: €3,500 to €4,500 for a small 3 kWp system, €5,000 to €7,500 for 5 kWp, and €10,000 to €13,000 for 10 kWp. A battery adds roughly €3,000 to €4,000 for 5 kWh or €4,500 to €6,500 for 10 kWh.

What moves the price is the roof more than the panels: how it is reached, what it is made of, how far the cable has to run to your consumer unit. That is why we quote after seeing it. Our cost guide breaks the figures down.

Usually six to nine years for panels on their own, on a home that is lived in all year. The more of the electricity you use during daylight, the faster it goes, so a villa with a pool pump and air conditioning does better than a flat that is empty until evening.

Panels carry output warranties of 25 years or more, so the years after payback are the point. A battery lengthens the payback, because it costs more than the extra electricity it saves in its first years; people choose one for independence and for backup.

No. Many websites still quote one, but Marbella’s 2026 tax ordinance has no IBI rebate for solar. What Marbella does offer is a 95% rebate on the construction tax (ICIO) for the solar part of the work. It has to be requested when the paperwork is filed, and we do that for you.

Other town halls differ. Estepona discounts ICIO by 50%. Mijas approved a 50% IBI rebate in October 2026 that is expected to apply from 2027. We check the ordinance for your municipality when we quote.

The Next Generation grants many people remember closed to applications at the end of 2023. At the time of writing (November 2026) two things are available:

• Income tax (IRPF). Spanish tax residents can deduct part of the cost of a self-consumption system installed and paid for in 2026, and there is a larger deduction for work that cuts a main home’s energy use by at least 30%, proved with energy certificates before and after. Nothing has been confirmed for 2027.
• Junta de Andalucía. The Andalusian Energy Agency opened a new incentive line in October 2026 for homes, which for solar requires a battery. Funds are limited and the conditions are strict.

We tell you plainly which of these your project can use and prepare the technical documents. For the tax return itself, speak to your gestor.

It can, with the right design. An empty house uses little, so most of what the panels make is exported, and exports are worth much less than the electricity you avoid buying. For a holiday home we size the system to the months you are here and to what runs all year (the pool pump, fridges, dehumidifiers), and we look at whether your supplier offers a virtual battery that banks summer surplus against later bills.

The income tax deductions are for Spanish tax residents, and not for holiday homes that are not let.

Not a building licence. In Andalucía, solar panels on an existing building on urban land are handled with a declaración responsable, a signed declaration filed with the town hall, and work can start once it is filed. We prepare and file it.

The exceptions are protected buildings and their surroundings, which need approval from the heritage authority first. In Marbella’s old town we check with the planning office before designing anything.

We do all of it, and it is included in the price:

• the declaración responsable and the ICIO rebate request at the town hall;
• the technical design report (or a full engineering project for systems over 10 kW);
• the electrical installation certificate and registration with the Junta de Andalucía;
• the self-consumption code and notification to the grid operator, e-distribución;
• the request to your electricity company to start paying for your surplus.

You sign a few forms and send us a recent bill.

Yes, more easily than most people think. Under article 17.1 of the Horizontal Property Act, a renewable energy system, whether shared or for one owner’s private use on the communal roof, can be approved by one third of the owners representing one third of the participation quotas. Owners who do not vote for a shared system do not pay for it, and can join later by paying their share.

We can attend the owners’ meeting with a design and the figures, which tends to make the vote straightforward.

It goes into the grid and your electricity company credits it against your bill. This is called simplified surplus compensation. Fixed tariffs pay between about 3.5 and 7 cents per kWh, most often around 6; on the regulated tariff you get the hourly market price.

The credit can reduce the energy part of the bill to zero but not below, which is why oversizing a system does not pay. Several suppliers now offer a “virtual battery” that carries unused credit forward to later months. Compensation typically starts one to three months after the system is registered.

On the roof, one to two days for most homes and up to a week for a large villa with batteries. From accepting the quote to switching on is usually three to six weeks, most of it waiting for materials and a slot in the calendar rather than for permits.

The system works from the day we commission it. Surplus compensation follows once registration has gone through.

Each kWp of panels (a little over two modern panels) produces around 1,600 to 1,700 kWh a year in Marbella. A home using 5,000 kWh a year therefore needs about 3 kWp, or seven panels, to match its consumption on paper; one using 15,000 kWh needs about 9 kWp, or twenty.

In practice we size to what you use in daylight, which the hourly data from your smart meter shows. The calculator gives a first idea from your bill.

South is best, but less essential here than you might expect. PVGIS data for Marbella gives a south-facing roof about 1,675 kWh a year per kWp; east and west faces give about 1,440 to 1,455, some 86% of that. An east and west split also spreads production across the day, which suits homes that use power morning and evening.

Flat roofs are easy: panels go on low frames, held by ballast where we want to avoid drilling the waterproofing. North faces and heavily shaded roofs are the ones we advise against.

It should not, and a careful installer makes sure of it. We fix to the structure underneath, never to the tile itself: each anchor is sealed and the tile goes back over it, so the tiles remain the weatherproof layer. Any tile that cracks is replaced with a matching one; we bring spares.

Before quoting we look at the state of the roof. If it needs repair we say so, because panels will sit on it for decades.

Not on their own. A standard solar inverter is required to shut down when the grid fails, so that it cannot feed electricity into lines people may be working on. Many owners found this out during the Iberian blackout of 28 April 2025.

To keep running you need a battery and an inverter with a backup function, wired so that the house, or the circuits you choose, is isolated from the grid when it goes down. It is worth deciding at the design stage; adding it later costs more.

It depends what you want from it. On savings alone, a battery typically raises the share of your electricity that comes from your own roof from 30–45% to 70–80%, but it takes longer to pay back than the panels do. If you want backup in a power cut, or you are away all day and home all evening, or your supplier pays little for surplus, it earns its place.

A reasonable middle course is to fit a hybrid inverter now and leave space for the battery, which can then be added in an afternoon. More on our battery page.

Usually, yes. If the existing inverter is a hybrid, a compatible battery connects straight to it. If not, we either replace the inverter with a hybrid or add a battery with its own inverter alongside (an AC-coupled battery), whichever costs less for your system. Send us the make and model of the inverter, or a photo of its label, and we can tell you which.

Yes. Marbella’s long dry summers and the Saharan dust that arrives several times a year leave a film that rain does not fully clear. A University of Málaga study measured an average loss of about 4% over a year, rising above 20% after long dry spells.

Once or twice a year is enough for most roofs, plus a wash after a heavy dust episode. We use soft brushes and purified water, without detergents or pressure washers, which can damage the coating and void the warranty. See maintenance.

From the manufacturers: typically 25 years on the panels themselves and 25 to 30 years on their output, 5 to 10 years on the inverter (extensions are available and often worth having), and 10 years on a battery. Our own guarantee covers the workmanship, and its term is written on your quote.

You receive the warranty certificates, the electrical certificate and the registration documents in one folder when the job is finished. Keep it with the deeds; a buyer’s lawyer will ask for it.

Every system we fit comes with the inverter maker’s app, which shows what the panels are producing, what the house is using and what is going to or from the grid, minute by minute. We set it up on your phone at handover and show you what a normal day looks like, so that an abnormal one stands out.

A little. Panels lose roughly 0.3% of their output for every degree their cells rise above 25°C, and on an August afternoon the cells can reach 60°C or more. The long days more than make up for it: July is still the best month of the year. Good airflow under the panels helps, which is one reason we do not mount them flush against the tiles.