Solar roof tiles have a big advantage in their appearance. They look just like normal roof tiles. They are the most visually appealing option for a PV system. They can also be used in listed buildings, which is rarely the case with other types of installation. In addition, the costs of a normal roof covering are eliminated for new buildings. 

The disadvantage, however, is that this technology is expensive. Installation in existing buildings involves additional costs as the existing roof covering must be completely removed. In addition, there is a high susceptibility to errors due to the individual wiring of the tiles.

roof-mounted photovoltaics

With in-roof photovoltaics, solar modules are integrated into the roof covering of a house. These modules generate electricity and at the same time provide protection for the roof. Unlike with roof-mounted installation, the PV modules do not require a frame. A sloping roof with a gradient of at least 12° is required for the drainage of rainwater.

In-roof photovoltaics score points with their striking appearance. The solar modules blend into the roof and create a uniform appearance. By integrating them into the roof skin, they are also less susceptible to wind. This way, you can save costs on roof covering, especially in new buildings. 

However, this option also has disadvantages. For existing buildings, the cost of rooftop photovoltaic systems is high. In addition, these systems may not be as well ventilated as rooftop systems, which can reduce their performance. 

Solar roofs for carports, winter gardens and terraces

Solar roofs are also found in carports, conservatories or on terraces. Semi-transparent glass is usually used here. They generate electricity and shade at the same time, letting around 20% of the sunlight through. The PV modules also protect against sun, wind, rain and hail.

How much does a solar roof cost? 

The cost of a solar roof is between €14,000 and €30,000. In-roof photovoltaics is the cheaper option. The price is €1,400 to €2,000 per kWp. A solar roof with solar roof tiles is more expensive. Each solar tile costs around €25, which amounts to €360 per square meter. 

Let us compare the costs of an 8 kWp in-roof photovoltaic system with solar roof tiles with 8 kWp output in a new building.

For existing buildings, the costs are higher because the existing roof covering has to be removed.

Are solar roofs subsidized?

There is a low-interest loan for solar roofs, the KfW 270. In addition, PV systems have been tax-free since January 1, 2023, so there is no VAT on purchase. If you feed solar power into the grid, you will receive a feed-in tariff.

Is a solar roof worth it?

From an economic point of view, a solar roof is rarely worthwhile due to the high investment costs. In-roof photovoltaics can be worthwhile under certain circumstances due to the lower costs, for example when electricity prices are over 40 cents/kWh. Solar roof tiles, on the other hand, are not worthwhile from a financial point of view. With a solar roof, the appearance outweighs the profitability. 

This is illustrated by the following Example.

Is my roof suitable?

Not all roofs are suitable for solar roofs. It is important that the roof has the correct orientation and the optimal angle of inclination. Roofs with an east-west orientation are ideal, as they offer enough space for the installation. At the same time, they lead to more even power generation. The angle of inclination should be between 20° and 40°. The roof should also be free of shade.

It is also important that the roof covering allows the use of a solar roof. Solar modules are heavier than conventional roof tiles. The roof must be able to bear the weight of the structure and the modules. 

What are the advantages and disadvantages of a solar roof?

Solar roofs stand out because of their appearance - that is their biggest advantage. They are particularly suitable for new buildings and listed buildings. However, you pay a higher price for this.