FAQ

Frequently Asked Questions

Here you can find answers to the most common questions about solar panel installations on the Costa del Sol, as well as how Marblanc Solar works with homeowners and businesses to deliver reliable, high-quality systems.

From understanding the installation process and costs to learning about local regulations, maintenance, and the benefits of solar energy in southern Spain, our FAQs are designed to give you clear, practical information.

If you still have questions, then please contact us for further assistance.

Solar Installations

It is possible to eliminate your electricity costs if your system is large enough, so there is no fixed limit to how much you can save. Please note, however, that you will still have monthly costs which are the mandatory standing charges, taxes and fixed fees – these vary depending on your provider.

For more information, read our solar guide on sizing your solar energy system to achieve an 80% reduction in electricity bills.

The payback period can range from four to seven years, depending on your available roof space and system size. Given that solar panels typically last for around 25 years, there is significant potential for long-term profit.

For more information, try our online solar break even calculator.

The answer is yes – but it depends on how your system is sized.

The Costa del Sol enjoys over 320 days of sunshine each year. On lightly cloudy days, panels can still operate at 80–85% efficiency. Even under heavy overcast, efficiency is typically around 30–40%.

For more information, read our solar guide on sizing your solar energy system to achieve an annual reduction of 80% in electricity bills.

Once you sign, we can usually complete the installation within 30 days, scheduling the work for a date that suits you. The installation itself typically takes up to three days. Your electricity supply is only interrupted briefly — usually for the final hour of work — so your home will function normally during most of the process.

To see how quickly our team installed solar panels on a property similar to yours, visit our installations page.

As a rule of thumb for standard installations ranging from 5-15kW, budget around €1,000 per kilowatt of capacity, plus a flat €1,000 on top. For example, a 5 kW system could cost about €6,000 (€5,000 for capacity + €1,000 base).

Specific costs vary significantly depending on your requirements, equipment, and property. You can read more in our post about the itemised costs of solar panels in Spain.

To get an accurate price for your property, contact Marblanc Solar for a Free Solar Survey.

We provide three years of free aftercare. After that, ongoing maintenance costs €200 per year, which includes cleaning the panels, system checks, and continuous monitoring through our app. We also offer access to one of our electricians at a discounted rate.

For more information, visit our post-installation support page.

You don’t sell your excess energy directly. Instead, you receive credit in the “virtual battery” included in most solar electricity deals in Spain. Any unused electricity — when your battery is full or you don’t have one — feeds back into the grid, and you receive credit to offset your consumption in future bills.

For more information, visit our virtual battery page.

Our systems are covered by manufacturer warranties of up to 25 years. We also add on our own 25-year workmanship warranty which covers the installation itself. While we can’t guarantee performance, you’ll receive a detailed proposal including expected performance figures – and you’ll have direct access us via a dedicated WhatsApp channel to ask us any questions about improving performance or reducing your consumption.

For more information, visit our post-installation services page.

No two solar systems are alike. For this reason, Marblanc Solar does not believe in sending a quote before seeing your property – from our experience, this only leads to false promises and badly managed expectations.

This is why we begin every proposal with a Free Solar Survey to determine your needs and design a system tailored to your property.

Click here for more information about the Free Solar Survey.

Installation Costs

Yes, you need a permit to install solar panels in Spain.

The permit is known as the ICIO (Impuesto de Construcciones, Instalaciones y Obras). It’s a municipal license and requires a payment to your local town hall.

The ICIO license is required in order to register your system on the boletín, which is essential for legalizing the installation and securing a solar feed-in tariff or virtual battery deal with your electricity provider. Additionally, having a legalised system is crucial for accessing solar incentives such as grants, income tax rebates, and property tax reductions.

Some town halls in Spain have applied a 95% reduction to the ICIO tax to encourage solar panel installations.

To find out if your local town hall offers this reduction, visit our post on solar incentives in Spain.

Is a virtual battery better than a physical solar battery?

They serve different purposes, and our honest recommendation is that a physical solar battery is always the better long-term investment where budget allows.

Here’s why.

With a physical battery, every 1 kWh of excess energy you store gives you 1 kWh back when you need it. With a virtual battery, because of the difference between the rate you pay for electricity and the rate you’re compensated for exports, every 1 kWh you put in effectively gives you back around 0.5 kWh in value.

That said, a virtual battery deal is something every solar homeowner in Spain should have in place – it’s far better than wasting your excess energy entirely. For homeowners who aren’t yet ready to invest in a physical battery, it’s an essential part of making your system work as hard as possible. At Marblanc Solar, we’ll always give you an honest comparison of both options as part of your free solar survey.

How much will I be paid for electricity I export to the grid?

Compensation rates for exported electricity vary by provider and by the specific deal you’re on – which is exactly why comparing providers matters. As a general indication, while you might pay around 0.12 €/kWh for electricity you draw from the grid, you may only receive around 0.06 €/kWh for electricity you export. It’s not a like-for-like exchange, but it’s significantly better than sending your excess energy back for nothing. Marblanc Solar runs comparisons across providers – including exclusive arrangements we’ve secured for our clients – to make sure you’re getting the best available rate for your exported electricity. Contact us for more information on current deals.

How does a virtual battery work?

A virtual battery is a service offered by electricity providers in Spain that allows you to store the excess energy your solar panels generate as credit on the grid – rather than in a physical battery at home. Throughout the day, your panels will often produce more electricity than your home is using at that moment. Without a virtual battery arrangement, that excess flows back into the grid and is largely wasted. With one in place, it’s stored as credit against your account. When you later draw power from the grid – in the evening, at night, or on a cloudy day – you draw down from that credit rather than paying for electricity at the standard rate. If your panels generate enough excess across the month, your bill could effectively reach zero – even without a physical battery installed.

Can Marblanc Solar help us get the most out of our system after installation?

Yes – and for commercial clients, this is often where the biggest gains are made. Through our aftersales care package, included free for three years with every installation, we provide remote consumption monitoring, 24/7 access to your survey engineer and co-owners via a direct WhatsApp channel, emergency callouts, and annual servicing. Beyond that, we actively support commercial clients with feed-in tariff comparisons, usage optimisation advice, and practical recommendations to align your highest-consumption activity with peak solar production hours. Getting the system right is step one – making sure it keeps delivering on its promises is what our aftersales care is built for.

How long does it take to see a return on a commercial solar installation?

Payback periods vary depending on the size of your system, your energy consumption, and the feed-in tariff arrangements in place for any excess energy your system exports. These figures are calculated as part of our free solar survey using real consumption data and performance simulations – so rather than giving a generic estimate, we’ll give you a payback period and ROI projection specific to your property and usage. Commercial installations tend to benefit from faster payback periods than residential systems due to higher daytime consumption aligning more closely with peak solar production hours.

Is Marblanc Solar’s free solar survey suitable for large commercial properties?

Yes – our free solar survey process is designed to handle installations of any size and complexity. For commercial properties, we carry out a full drone scan of the roof and building, a qualified inspection of your electrics, and a thorough Q&A covering your past electricity usage and future consumption requirements. We then model the system using Pylon, world-leading performance simulation software, to produce payback period calculations, ROI projections, and an itemised quote with system comparisons. The result is a proposal built on real data – not assumptions – regardless of how large or complex your installation is.

Will dirty panels really make a noticeable difference to my electricity bill?

Yes – significantly more than most homeowners expect. Solar panel production can drop by 30% or more due to accumulated mud-rain, dust, and pollen. On a well-sized system, that’s a substantial amount of energy – and a direct hit to the savings your installation was designed to deliver. A professional clean is one of the simplest and most cost-effective ways to make sure your system keeps performing at its best year-round.

Can’t I just clean my solar panels myself?

You can – but there are a few things to get right first. Regular window cleaning products can damage the anti-reflective coating on panel surfaces, reducing their efficiency over time. Tap water in many parts of Spain is hard and will leave mineral deposits as it dries, which compounds the dirt problem rather than solving it. You’ll also need to consider safe access to your roof and the time involved – a thorough clean on a larger property can take up to two hours. Our in-house technicians arrive with the right materials, the right equipment, and the experience to do the job properly without risking damage to your system.

How often should I have my solar panels cleaned in Spain?

In Spain, we recommend at least one professional clean per year – timed after the worst of the Calima season or spring pollen, when buildup tends to be at its heaviest. In areas particularly prone to dust, bird activity, or pine tree pollen, a second clean may be worth considering. For all Marblanc Solar clients, one free panel clean per year is included for the first three years as part of our aftersales care package. To book yours, simply message us through your direct WhatsApp channel and we’ll arrange a time.

What does remote consumption monitoring actually do?

Remote consumption monitoring allows our team to see exactly how your solar system is performing in real time – how much energy your panels are generating, how much your home is consuming, and how efficiently your battery is charging and discharging if you have one. If we spot anything that suggests your system isn’t performing as it should, or if there are changes you could make to maximise your savings – switching the timing of high-draw appliances, for example – we’ll flag it directly through your WhatsApp channel.

Can I get the aftersales care package if my system was installed by another company?

Yes – our aftersales care package is available to any homeowner on the Costa del Sol or Costa Blanca for €400 per year, regardless of who carried out the original installation. If you’ve been left without support by your original installer, or simply want the peace of mind of having a qualified, in-house team behind your system, get in touch and we’ll discuss what’s involved.

What happens if my solar system develops a fault?

If your system develops a fault, you contact us directly through your dedicated WhatsApp channel – available 24/7. We’ll assess the issue remotely where possible, or dispatch one of our in-house qualified electricians for an emergency callout if needed. Because we use an in-house team rather than subcontractors, there’s no confusion about who is responsible. We are – and our 25-year workmanship warranty makes that a legal commitment, not just a promise.

Is the aftersales care package really free?

Yes – for every client who installs a solar system with Marblanc Solar, the aftersales care package is included free of charge for three years from the date of installation. After three years, it’s available to continue for €400 per year. The package includes remote consumption monitoring, a direct WhatsApp channel with your survey engineer, project manager and co-owners, emergency callouts, free annual servicing, and a free annual panel clean during calima or pollen season.

Can a solar EV charger work during a power cut?

Not without a backup box. During a power cut, your solar inverter shuts down automatically – a mandatory safety feature that prevents electricity from being fed back into the grid while engineers are working on the lines. This means your EV charger, like everything else in your home, will stop working during an outage. The solution is a backup box, which detects the loss of grid power and instantly switches your home to draw from your solar system or battery instead. With a backup box installed, your EV charger can continue operating during a power cut, as long as there’s sufficient energy available. If you live in an area with frequent outages and want to keep charging uninterrupted, a backup box is an essential part of the system.

Can I add an EV charger to my existing solar installation?

Yes – adding an EV charger to an existing solar installation is something we do regularly. If you’re already a Marblanc Solar client, there’s a good chance your system was designed with future upgrades in mind, making the addition straightforward. If your system was installed by another company, we’ll need to assess it first to make sure it’s correctly specified to support an EV charger – in some cases, additional work may be required before we can connect one safely. If you’re not currently a Marblanc Solar client and want to explore adding an EV charger to your existing setup, get in touch and we’ll arrange a consultation.

How long does it take to charge an electric car on solar power?

Charging speed depends on the power rating of your EV charger. We install chargers ranging from 7.4kW units – such as the Huawei SCharger-7KS-S0 we fitted for a client in Fuengirola – up to 22kW chargers, like the Huawei unit we installed for a client in Mijas Costa. A 7.4kW charger will typically add around 40–50km of range per hour of charging. A 22kW charger can add significantly more, making it a better fit for drivers who cover longer distances or need a faster turnaround between charges. During our Free Solar Survey, we’ll assess your car’s battery capacity, your daily driving habits, and how quickly you need to charge – and recommend the right charger speed for your setup.

Can I charge my electric car entirely on solar energy?

Yes – but it requires a highly accurate system design to make it work reliably. EV chargers consume a significant amount of electricity, and without careful sizing, your charger can quickly draw more power than your panels are producing, pulling the remainder from the grid and increasing your bill rather than eliminating it.

The key variables are your panel output, your charger’s power rating, and the times of day you typically charge. During our Free Solar Survey, we’ll work through all of these with you to design a system that can genuinely cover your charging needs on solar energy. A battery is also worth considering – on cloudy days or after dark, a battery gives you stored solar energy to draw from rather than falling back on the grid. Without one, any charging outside of peak solar hours will pull from the grid as normal.

Can a backup box be added to an existing solar installation?

Yes, adding a backup box to an existing solar installation is something we do regularly, including for systems we didn’t originally install.

If you already have solar panels and want to add backup protection, get in touch and we’ll assess your current setup. In some cases, particularly where the original installation wasn’t carried out to a high standard, additional work may be required before a backup box can be added safely. We’ll always advise you on exactly what’s involved before any work begins.

At Marblanc Solar, every backup box installation is backed by a 25-year workmanship warranty – so whether it’s a new installation or an upgrade to an existing system, you have complete peace of mind on performance and long-term reliability.

Do I need a battery to use a backup box?

No, you can install a backup box without a solar battery, and it will work during a power cut. If the outage happens during daylight hours and your panels are generating, your home will stay powered.

However, if the grid goes down in the evening or at night, a backup box without a battery won’t provide power, as there’s nothing stored to draw from. For most homeowners, pairing a backup box with a battery is the setup that provides genuine peace of mind – covering outages at any time of day or night.

That said, if budget is a consideration, starting with a backup box and adding a battery later is a valid approach, provided the system is designed from the outset to accommodate the upgrade.

How long will a backup box keep my home powered during an outage?

A backup box on its own – paired only with solar panels and no battery – will keep your home powered for as long as your panels are generating electricity. That means daylight hours only. If the power cuts out in the evening or overnight, a standalone backup box without a battery won’t help.

The best setup is a backup box paired with a solar battery. That way, whether the outage happens at midday or midnight, your stored energy kicks in and your home keeps running. How long that lasts depends on the size of your battery and what you’re running.

During our Free Solar Survey, we’ll calculate exactly how long your system would last based on your actual usage – so you know precisely what to expect before you invest.

What appliances can a 3 kW backup box power?

A standard 3 kW backup box can comfortably run the essentials – a fridge, a freezer, internal and external lighting, a Wi-Fi router, a home security or alarm system and plug sockets in key rooms for charging phones, laptops or running smaller kitchen appliances.

The key is selecting your priority circuits sensibly. Where a standard backup box falls short is if you try to run high-draw appliances at the same time – an electric boiler, oven and car charger on priority circuits simultaneously would trip the system.

During our Free Solar Survey, we’ll walk you through exactly which circuits to prioritise based on your home and lifestyle, so the system performs exactly as expected when you need it most.

What is the difference between a standard backup box and a UPS backup box?

There are two types of backup system available – a standard backup box supplies up to around 3 kW of power to essential circuits during a blackout.

During our Free Solar Survey, we’ll sit down with you and map out exactly which parts of your home should stay powered – typically things like plug sockets in key rooms, the fridge, the freezer, lighting, your Wi-Fi router and a home security system. Non-essential loads like a pool pump, electric oven or a car charger go on a separate circuit and won’t run during an outage.

A UPS (Uninterrupted Power Supply) backup box is the whole-home solution – it powers every circuit in the house seamlessly, with no interruption, for as long as there’s energy available in your battery. If you don’t want to think about priority circuits and simply want everything to keep running as normal, a UPS is the way to go.

A standard backup box can be three to four times cheaper than a UPS, so understanding which one you actually need can make a significant difference to the cost of your installation.

Why do my solar panels shut down during a power cut?

When the grid goes down, your solar inverter shuts off automatically – even on a bright sunny day and even if you have a solar battery installed. This is a mandatory safety feature, not a fault.

Your inverter relies on a signal from the grid to function and when that signal disappears, it cuts off power flow from your panels to your home. The reason this is required by law is to protect utility workers – if solar systems continued feeding electricity back into the grid during a repair, engineers working on the lines could be electrocuted.

As a solar installer operating in Spain, this is non-negotiable for us. It applies to every solar system in the country, regardless of who installed it or what equipment is fitted.

What is a backup box and how does it work with solar panels?

A backup box is a piece of equipment that keeps your home powered when the grid goes down. It works by constantly monitoring the connection between your home and the grid using smart relays inside the unit. The moment grid power cuts out – even for a fraction of a second – those relays isolate your fuse board and switch your home’s power source to your solar system or battery.

The whole process happens in 0.1 – 0.2 milliseconds. That’s fast enough that sensitive electronics like Wi-Fi routers, fridges and lights keep running without interruption. The lights don’t flicker, the fridge stays cold and your desktop computer or TV shouldn’t even turn off. It’s a seamless switch that makes a significant difference for anyone living in an area with unreliable power.

What happens to my solar battery during a power cut?

During a power cut, your solar inverter will shut down automatically – even if you have a battery installed. This is a mandatory safety feature built into all solar inverters, designed to prevent electricity from being exported to the grid while engineers may be working on cables. Without this protection, solar generation could put workers’ lives at risk.

The consequence, however, is that without additional equipment, a power cut will leave you without power, even if your battery is fully charged – the solution is a backup box. A backup box allows your inverter to detect the loss of grid power and switch seamlessly to drawing solely from your battery, isolating your home from the grid entirely. If you live in an area with frequent outages – or simply want the peace of mind of true energy independence – a backup box is an essential part of the system.

Can I add a battery to an existing solar panel system?

Yes, adding a battery to an existing solar panel system is something we do regularly.

Many clients want storage but aren’t ready to invest at the point of their original installation, or they want to see how their savings perform before committing to the additional spend. Where possible, we help those clients install a panel system from the outset that can be easily upgraded with a battery later.

For clients who originally installed with a different company, we also offer battery upgrades as a standalone service. We regularly receive calls from homeowners whose original installer has become unresponsive and adding a battery to a third-party system is something we’re experienced in handling.

It’s worth noting this can sometimes require upgrading the inverter, or in cases where the original installation wasn’t up to standard, addressing faulty wiring before a battery can be added safely. If you’re looking to upgrade an existing system and aren’t currently a Marblanc Solar client, contact us and we’ll advise on what’s involved.

What is the best solar battery brand available in Spain?

There are several excellent solar battery brands available in Spain, and the major manufacturers – Huawei, Fronius and Tesla Powerwall among them – all perform the same core function: storing electricity generated by your panels for use later.

Marblanc Solar is a certified installer for all three, as well as other leading brands, and our team undergoes regular manufacturer training to ensure we’re specifying and installing each system correctly.

That said, we most commonly recommend Huawei solar batteries. Their systems integrate exceptionally well with equipment like backup boxes and EV chargers, and they offer superior safety features.

For clients with home automation setups, Huawei’s open API also allows the battery system to interconnect with the wider smart home – something that matters more and more as homes become increasingly connected.

How long will a solar battery last through the night?

How long a solar battery lasts overnight depends entirely on your usage.

During the Marblanc Solar Free Solar Survey, if you express an interest in battery storage, we’ll take you through a thorough Q&A to work out exactly what size system you need.

If, for example, you want a battery to run your air conditioning through the night, we’ll look at your AC unit’s power consumption rating. If your AC consumes 2 kW of power and you want to run it for seven hours, we’d recommend at least a 14 kW battery – and that’s before accounting for anything else running in the home.

The full calculation gets more involved, but that’s exactly what the Free Solar Survey is for. Book yours and we’ll work through it together.

Do I need a permit to install solar panels in Spain (ICIO)?

Yes, you need a permit to install solar panels in Spain.

The permit is known as the ICIO (Impuesto de Construcciones, Instalaciones y Obras). It’s a municipal license and requires a payment to your local town hall.

Some town halls in Spain have applied a 95% reduction to the ICIO tax to encourage solar panel installations.

To find out if your local town hall offers this reduction, visit our post on solar incentives in Spain.

How do you design a solar energy system?

This is why we begin every proposal with a Free Solar Survey to determine your needs and design a system tailored to your property.

Click here for more information about the Free Solar Survey.

What warranties and performance guarantees do you provide?

For more information, visit our post-installation services page.

How does connecting my solar system to the Spanish electricity grid work? Can I sell my excess power?

For more information, visit our virtual battery page.

What after-sales services do you offer?

For more information, visit our post-installation support page.

How much do solar panels cost?

Specific costs vary significantly depending on your requirements, equipment, and property. You can read more in our post about the itemised costs of solar panels in Spain.

To get an accurate price for your property, contact Marblanc Solar for a Free Solar Survey.

How long will my solar installation take from signing to activation?

To see how quickly our team installed solar panels on a property similar to yours, visit our installations page.

Will solar panels produce enough energy during the winter or on cloudy days on the Costa del Sol?

The answer is yes – but it depends on how your system is sized.

For more information, read our solar guide on sizing your solar energy system to achieve an annual reduction of 80% in electricity bills.

What is the typical break-even period for solar energy systems?

For more information, try our online solar break even calculator.

How much can I save on my electricity bills with a solar installation?

For more information, read our solar guide on sizing your solar energy system to achieve an 80% reduction in electricity bills.

Can I request changes to my solar proposal?

Yes – and this is one of the things that sets Marblanc Solar apart.

As far as we know, we are the only solar installer on the Costa del Sol and Costa Blanca that presents your proposal in person during a dedicated second home visit. We do this for two reasons:

First, so we can walk you through the reasoning behind every decision – the layout, the equipment specified and the projected savings – rather than emailing you a PDF and hoping it makes sense.

Second, because our design software allows us to make adjustments in real time. During your proposal visit you can ask us to:

Add or remove panels from the system
Add or remove equipment, such as a battery
Switch panel types – for example, from standard monocrystalline to full-black panels

We’ll show you immediately how each change affects the aesthetics, the projected savings, and the total investment. For adjustments that require more detailed calculations, we’ll have a revised proposal back to you within 24 hours.

In most cases, clients leave with at least two final proposals to compare so you can make the right decision for your home and your budget without feeling rushed.

Can I see how the solar panels will look on my roof before committing?

Yes.

Your proposal includes professional mockups designed with the industry-leading software Pylon.

These designs show you the exact layout of the solar installation on your roof – so you can see precisely how it will look before agreeing to anything. This is produced as part of your Free Solar Survey, which provides over €250 worth of survey, design and proposal value at no cost and with no obligation.

How do you handle cables, roof penetrations, and tidying up after installation?

All cables are hidden from view as standard. We use existing ducting wherever possible to route cables discreetly through your property. Where we need to create a new penetration through a wall or ceiling, we core drill a clean hole and plaster it over on completion so there’s no visible trace of the work.

Any roof tiles disturbed or broken during installation are replaced. Once the system is commissioned and signed off, we carry out a full site clean-up before we leave.

You won’t know we were there – except that your electricity bill will look very different next month.

What other equipment can you install alongside solar panels?

A solar panel system is often the starting point for a broader move towards energy independence — and we can project manage the full picture for you.

EV chargers

We install electric vehicle chargers that integrate with your solar system, allowing you to charge your car on the energy your panels generate, rather than paying grid rates.

Solar batteries

Store the surplus energy your panels produce during the day and use it at night or during periods of low generation, reducing your reliance on the grid further.

Backup boxes

Keep essential appliances running during a grid outage. A backup box gives you power continuity, even when the grid goes down.

Plumbing and heating systems

We can also project manage the installation of plumbing-based systems that pair well with solar, including air-to-water heat pumps, underfloor heating and pool heaters. These are installed in coordination with qualified plumbing contractors we work with, while we manage the full project on your behalf.

Pergolas and custom steel frames

Sometimes the best location for your panels isn’t your roof. We can design and build custom pergolas and steel mounting frames for ground-mounted or terrace installations. Where a structure requires an engineering sign-off, we bring in our trusted structural engineer to secure the necessary licence, design the frame and oversee the custom build – so your installation is both structurally sound and fully compliant.

Each of these can be installed as part of your initial solar installation or added later.

What aftersales care does Marblanc Solar provide?

Every Marblanc Solar client receives our aftersales support package free of charge for three years from the date of installation.

It starts the moment your system goes live. In the first two weeks, your survey engineer monitors your system remotely – through your solar app and directly via your inverter data through our installer account.

We’re looking for two things:

Problems: anything that suggests your system isn’t performing as it should. Low output relative to solar conditions, efficiency drops or unusual patterns that might indicate a configuration issue. If we spot something, we call you and fix it.
Opportunities: patterns in your consumption that are costing you money unnecessarily. Running your pool pump at night and paying grid rates when you could shift it to daytime and run it on free solar energy. Unexpected spikes in consumption pulling electricity from the grid at peak times.

After two weeks, your survey engineer calls you directly with findings and recommendations for optimising your usage around your system’s output. We will then assist with installing plug timers, optimising circuits or finding a better solar feed-in tariff.

From there, your three-year package includes:

Direct WhatsApp access

You’ll be added to a dedicated WhatsApp group with your survey engineer, Project Manager John Bradley, as well as co-owners Roman Mitchell and Adam Millington. Message any day of the week for questions, concerns or emergencies. You’re talking directly to the people who know your system.

Annual service

Once a year we carry out a full system service, checking your inverter, connections and panel performance to ensure everything is operating at its best.

Annual panel clean

Solar panel output degrades with dust and soiling, particularly during the dry summer months on the Costa del Sol and Costa Blanca. One professional clean per year is included as standard.

Emergency callouts, 7 days a week

If something serious goes wrong, we come to you. Emergency callouts are available seven days a week for serious emergencies for the full three years.

Does Marblanc Solar help me with the solar feed-in tariff?

Installing solar changes what the best electricity tariff looks like for your home – and most homeowners don’t realise their current deal is no longer the right one once their panels are live.

As part of your aftercare, we take your electricity bill and run a comparison against the solar feed-in tariffs currently available on the market. We identify which deal will maximise the value of the energy your system exports back to the grid. We have a direct relationship with one of Spain’s leading providers of solar feed-in tariff deals, through which we can secure preferential rates for our clients (further details available once your installation is confirmed).

We can also review your current supplier’s available solar tariffs to ensure you’re not missing a deal that’s already available to you.

Once you’ve identified the right tariff, we support you through the switchover process from start to finish.

What warranties does Marblanc Solar offer?

We extend all equipment warranties to the maximum limit offered by the manufacturer – typically 25 years. This means your panels and inverter are protected for the long term.

But we’re also the only solar installer we know of on the Costa del Sol and Costa Blanca to provide a workmanship warranty. This warranty is detailed in your solar proposal and means we take full responsibility for the correct working of your system – not just the equipment inside it.

With most other installers, there is no service agreement and no workmanship warranty. If something goes wrong after installation, you’re on your own. We think that’s unacceptable. We stand by every system we design and install – and we put that in writing before you spend a penny.

What happens after my solar panels are installed?

Once your system is installed, commissioning is handled by our Project Manager John Bradley – a qualified electrician holding a QQI Level 6 Advanced Certificate Craft in Electrical from the Technological University Dublin.

John connects and configures your inverter, verifies that all system components are communicating correctly, and confirms that your panels are actively generating power before he leaves your property. Every electrical connection is tested and signed off by a qualified electrician – the same standard applied to every Marblanc Solar installation.

Once the system is live, you’ll have a dedicated handover session with both John and the survey engineer who designed your system. Together, they’ll walk you through:

Your system components: every part of your installation, what it does and where it is
The solar monitoring app: how to read your real-time generation, consumption and export data in your solar app, as well as what to look for day to day
Safety features: the location and operation of your isolator switches, what to do in the event of a fault and when to call us
Your questions: a dedicated Q&A session with the people who designed and built your system, not a call centre

You won’t be handed a manual and left to figure it out. You’ll leave your handover session knowing exactly how your system works and who to call if anything ever changes.

Do you register every system with the authorities?

Yes, we make sure every solar installation is fully legal.

Solar installations in Spain require a specific sequence of legal and administrative steps – getting them wrong can affect your ability to access the solar feed-in tariff or claim any available incentives. Our certified electricians handle the entire process on your behalf.

Here’s what’s involved:

Declaración Responsable

We prepare and submit the Declaración Responsable. It’s the formal notification of your installation to the relevant authority. This requires technical documentation signed by a qualified solar installer holding the Carnet de Instalador de Baja Tensión (the Spanish low-voltage installer licence). Every Marblanc Solar installation is signed off by a licence holder.

Licencia de Obra Menor

In most cases, your installation also requires a Licencia de Obra Menor from your local town hall (Ayuntamiento). This involves payment of the ICIO tax – however, the majority of town halls apply a 95% reduction on this tax for solar installations, significantly reducing the cost.

You can see an overview of the ICIO tax reductions available in popular towns in the provinces of Malaga, Cadiz, Almeria, Cordoba, Huelva, Jaen, Sevilla, Alicante, Castellon and Valencia here.

Post-installation certification

After your system is installed and commissioned, we provide:

The Certificado de Fin de Obra which confirms the installation has been completed
The Certificado de Instalación Eléctrica (CIE), also known as the boletín, which is the electrical installation certificate required for your system to be legally connected
Registration of your installation in the industrial registry of your autonomous community

All of this is handled by our team – you don’t need to navigate Spanish bureaucracy on your own.

What solar panel and inverter brands does Marblanc Solar install?

Marblanc Solar are official partners and registered installers for some of the world’s leading solar and inverter manufacturers – including Enphase, Fronius, Tesla, SolarEdge, Growatt, Deye, Goodwe and Huawei.

Whatever equipment your system requires, we have the experience and accreditation to install it properly.

Solar Inverters

We are most experienced in installing solar inverters from the brands we are partnered with.

While can work with any existing setup or client request, we recommend Huawei inverters to the majority of our clients.

This is for three reasons:

Huawei’s superior safety features and reliability (read a longer explanation about why we recommend Huawei inverters here)
The Huawei FusionSolar app, which gives you clear, real-time monitoring of your system’s generation and consumption from your phone
Seamless integration with other equipment – solar batteries, EV chargers, back up boxes – should you choose to expand the system

Solar Panels

We can work with all solar panel brands. That said, we recommend JA Solar panels for their high efficiency and long-term reliability. We have also installed systems using Hyundai panels and a range of other leading manufacturers.

Whether you’re looking for regular monocrystalline panels or all-black solar panels – which offer a sleeker, more discreet finish popular with homeowners who want a cleaner look on their roof – we’ll recommend the right panel for your property, budget, and system requirements.

How long until I break even?

Break-even depends on your system size, usage patterns, and current tariff. Our Free Solar Survey produces a precise break-even estimation for your property — not an industry average, your actual numbers.

What if I already have solar panels?

If you already have a system, we can expand it. We carry out a technical site visit to assess your current setup and explore how to increase your capacity to meet growing energy needs — whether that’s adding panels, upgrading your inverter, or adding battery storage.

Hear From Our Clients

Marblanc Solar is the top-rated solar installer focusing on the Costa del Sol and the Costa Blanca in Spain. Hear what our clients say about working with us.