Maintenance of solar panels

IBI discount

Benefit from a 30%
discount for 2 years

Comprehensive service

We take care of everything so you don't have to worry about the entire process

Quick and easy

In a few days and without construction, it will be installed by qualified personnel

High profitability

Investments with annual returns of 10% and a return period of 8 to 12 years

100% renewable

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At Bancells we believe that good maintenance extends the useful life of your solar installation. For this reason, we offer maintenance services depending on what you are looking for:

  • Annual energy reports so you can rest easy knowing that your installation is performing well.
  • Cleaning the solar field with pure, deionized water.
  • Inspection of the installation by qualified technical personnel.

We differentiate between preventive and corrective maintenance:

  • The first, preventive maintenance, anticipates possible errors or system failures by being able to act quickly to avoid damage or run out of production.
  • The corrective maintenance, as the name suggests, is about solving installation execution problems either because they were done wrong in the first place or because of the wear and tear of time.

Whatever maintenance you need, Bancells can offer it in the best conditions of safety, quietness and confidence, bearing in mind that we offer these maintenances to anyone who wants them, regardless of whether the installation was done by us.

In recent years, the number of solar panel installations has increased considerably, causing a high number of operators, some of whom have seen opportunism in the sector. Unfortunately, there are cases where this solar installation hasn’t run successfully, failed to complete, or has not even started. If this is your case, don’t worry anymore, contact us because we can help you, we will take care of: 


We will review the facility from top to bottom and write an audit.


We will detect all possible defects in the installation, both at the documentary level and at the execution level.


We will inform you of the solutions we propose.


We will fix the defects and you will get an installation with the maximum performance that can be extracted from it.

Maintenance of photovoltaic solar panels

Regular maintenance of solar panels extends the lifespan of your photovoltaic installation. In fact, it is essential to ensure optimal system performance and minimize interruptions in energy production.

Preventive Maintenance

Preventive maintenance for solar panels is an essential practice to ensure optimal performance and extended lifespan of your photovoltaic installation.

Through this proactive approach, the likelihood of unexpected failures is reduced, overall system performance is improved, and its lifespan is prolonged.

Corrective Maintenance

Corrective maintenance for solar panels is crucial when there is a failure or malfunction identified in the system.

At Bancells Ecotècnics, we strongly believe that a quick and effective response to failures ensures that the photovoltaic installation continues to produce energy efficiently and reliably. 

Frequently Asked Questions

Here you can find the information you need. If you have any questions, please contact us!

The connection of the solar system to the internal network of the building saves electricity from those kWh that are generated thanks to the solar panels and, therefore, do not have to be imported from the distribution network and are not registered at the electricity meter.

Two textures can be given. The first is that the production of the plates is higher than the instantaneous consumption of the building, in this case the difference (called surplus) is exported to the distribution network for its compensation in the electricity bill (discount in the energy term of the invoice); the second tessitura is that the production of the plates is lower than the instantaneous consumption of the building, and in this case work is done in parallel between the solar installation and the distribution network.

Add that, in the first tessitura, you can choose to install a battery, which would mean increasing savings and storing these surpluses to use when there is no production. Once the battery is full, the surplus will continue to be sent to the distribution network.

The virtual battery is a concept that some marketers apply within their range of products. The current rule states that surplus compensation is a monthly record, not an annual one. This can mean that if the energy term of the electricity bill is less than zero, they would be giving away kWh to the electricity distribution company (usually happens in extremely oversized installations) . The virtual battery means applying a price to these kWh called uncompensated surpluses that the marketer will reserve in euro format to be able to discount later (for example during periods with few hours of sunshine). The problem becomes when this piggy bank only grows and shrinks very little, it would mean that the customer is losing money indirectly. Sooner or later this virtual battery will be canceled or disappear and it will be necessary to know how this money is managed.

However, the long-term solution is physical batteries.

Although it is detailed in the personalized study-quote you will receive, the plates we install offer a 25-year warranty for both production and mechanics, at the end of the installation you will receive a personalized certificate of these plates with the numbers of the plates installed in your home.

In relation to the inverter it varies depending on the brand to be installed. For example, Huawei offers a 10-year warranty, while Enphase offers 25.

As a rule, our installation work must be guaranteed for 3 years. However, and thanks to the experience in the sector and the good quality of labor with our own staff, we offer a guarantee of 5 years, two above the norm.

We are Technical Architects and we know the structure and construction processes of buildings. We apply a technique that prevents the entry of water through the holes made in the roofs. We always make these holes on the roof tile, never on the roof tile; the hole is sealed with a pressed elastomeric rubber that prevents the entry of water and, above this anchorage, the solar plate circulates. It is impossible for water to enter through this hole.

On flat roofs we usually install a self-supporting structure, thus avoiding drilling the waterproofing sheet.

The current law allows this to be done in two different situations:

  1. In the event that the customer is a self-promoter of works and is building or renovating the house under a municipal works licence. This home must be a regular residence and cannot be rented and/or sold.
  2. As long as and when the following conditions are met (all of them):
    1. The customer is an individual and not an entrepreneur or freelancer.
    2. The reform and/or construction of the house must have a final work certificate 2 years before the solar installation.
    3. The ratio between the total budget of the installation and the material of the installation itself should be a maximum of 40%, with the remaining 60% being execution labor.

The answer is no. For safety reasons, all solar inverters for instantaneous self-consumption must be stopped in these cases. Now, there are devices on the market that allow you to reactivate your installation in these cases, but a battery is necessary for the installation of plates.

Shared self-consumption is a regulated self-consumption methodology within the RD244/2019 standard. In a generic way, it is about distributing the generation of electricity between several neighbors. In the electrical circuit of the solar installation, an Endesa-approved meter, called a generation meter, must be added, which will record all the kWh of the solar installation. Neighbors who wish to participate in this methodology must distribute the kWh generated according to distribution coefficients, so that each neighbor will be deducted from their electricity bill the percentage of kWh produced that they have agreed upon at the community meeting of owners

If one neighbor has a higher consumption than another it is not a problem since both the neighbor who consumes more and the other will be deducted the percentage that belongs to them, no more and no less.

It consists of deducting a percentage of the solar installation budget from the individual INCOME statement. This percentage varies depending on the reduction of primary energy in the home where it has been installed. To be able to calculate this energy reduction, two energy efficiency certificates are necessary, one before the installation and one afterwards; it must be borne in mind that the computer program for energy certification only takes into account electricity consumption for air conditioning and domestic hot water generation; therefore, if these two installations come from an energy source other than electricity, it is very likely that the reduction percentage will not be reached and, consequently, it will not be possible to de-tax the solar installation in the RENTA .

At Bancells we can advise you on this situation and indicate beforehand whether you could achieve this energy reduction.

These are rebates on two municipal taxes. The first corresponds to the Real Estate Tax (IBI) which varies depending on the Fiscal Ordinance of each City Council. This bonus is requested once the installation of plates is legalized, and the request consists of registering an instance at the Town Hall of your municipality. Be patient because they usually respond quite late.

On the other hand, the Construction, Installations and Works Tax (ICIO) is usually subsidized by 95%, having to be applied for together with the registration of the previous communication of works. Depending on the municipality, this bonus is applied immediately, but the vast majority is later, having to pay the entire tax and then request its refund.

The roofs of multi-family buildings are part of the outer skin of the building and are therefore communal, regardless of whether it is a flat or inclined roof. In the case of flat roofs assimilated to terraces of the last homes, it is necessary to know the constitution of the community of owners and to know whether these elements were deeded as communal for private use or private property of the home in question.

In any case, a meeting of neighbors is necessary for the installation of solar panels on the roof of the building and the resolution must be approved by a simple majority (those attending the meeting +1).

This statement is true. The plates are connected in series, therefore if one is in the shade its working voltage will be reduced, reducing at the same time the rest of the same circuit. However, there are technical solutions that allow you to minimize or avoid these effects, such as shadow optimizers. These devices force the inverter to work individually on the plate that is connected, so that it is separated from the rest of the circuit and does not affect the general production.

On the other hand, there are micro-inverters on the market. These devices are small inverters that are installed behind each solar panel so that the entire solar field works individually. Depending on the type of installation or cover it is recommended, but it is not recommended to always work with these devices, because in cases where they are not necessary the project has an additional cost that could be avoided.

The topic of sizes has always been a taboo when it comes to talking about it, luckily in solar photovoltaic it is very different. The efficiency of a solar panel is measured by the solar radiation in W/m² that it receives from the Sun, this efficiency is measured in %. Currently, the high efficiency plates are those that offer approximately 20-21%; considering that a 500W plate has a very similar surface to a 410W it is very likely that both plates have similar efficiency.

In this sense, a higher efficiency of the installation will not be obtained by more solar panel power. What’s more, working with large-sized solar panels (500W-550W-600W) can become a logistical problem for your installation and the space they occupy; at the same time it is a dangerous overload for the installer who has to move a surface of more than 2m² on an inclined plane.

In the end what you need is an installed power that fits your demand, therefore in this sense a smaller size does not mean less efficient.

In the last two years, solar installations in homes have skyrocketed and many operators have taken advantage of this ‘boom’ to enter the market, including banking, insurance and oil companies; many of these operators offer a lower price (up to points that are cause for concern) because they also reduce the price in the quality of material or subcontract unskilled labor obtaining a very cheap solar installation but surely the its useful life will be less than 25 years.

A photovoltaic solar installation is still an investment that, at least, must have a useful life of 25 years, and here many external factors come into play apart from the material, and it is the installer himself, so the quality of a work not only the material itself but also how it has been executed.