We plan and build on suitable roofs of 600 square meters or more for our own portfolio or for other investors.
Max Renewables is looking for suitable roofs in Germany and some European countries for leasing.
Smaller roofs may be of interest to our alliance partners.
In addition to feeding into the power grid, reducing your own electricity costs can also make the investment in a solar system very profitable.
Talk to us, we plan and build for you cost effective and reliable.

Economic aspects of PV roof systems

The economic viability of a PV roof system in a country depends on a number of conditions:

• there is an available grid for the feed-in
• is there a secure and lucrative model for paying for the electricity fed into the grid?
• what are the local costs for electricity purchase?
• what are the local costs of purchasing and installing a system?

In most highly industrialized countries with good distribution and transmission grids, many PV systems have been installed on roofs for 20 years, mainly feeding into the local grid and receiving a steady payment through subsidies.

Since the costs of electricity generation and also the income from the remuneration of the PV systems have steadily decreased, more and more systems are operated in parallel to the grid - this means that part of the electricity is consumed locally, which immediately reduces the electricity bill, and another part (the surplus electricity) is fed into the grid.

Below are some key figures for typical plant sizes (data basis 2020):

Assumptions: No interest costs, operating costs included (insurance, spare parts, maintenance). Own calculation.
As soon as the self-generated electricity is consumed on site, the solar system pays off much better.

A photovoltaic investment in a PV roof system is one of the most lucrative investments in the private sector in the EU countries due to the state-guaranteed remuneration with proven technology in combination with often good tax advantages.

Some technical aspects of PV roof systems

Nowadays we assume an average life span of a well maintained PV system of 30 years. Conversely, this means that the roof on which the PV system is mounted should of course remain in good condition for another 30 years. In the case of roofs that are in a state of disrepair, a roof renovation should be considered, which must be technically adapted to the installation.

The possible shading by other buildings or trees has negative effects on the yield. These losses can be calculated by a simulation by an expert.

The simplest and most cost-effective installation is on constructions of trapezoidal sheet metal panels. Mounting on roof tiles or slate is more complex. Flat roof constructions are usually elevated. A distinction is made here between installations where the installation is screwed to the roof and constructions which are statically secured by ballast without screws.

For all possible roof projects should be available:

• a statics of the roof
• a review of the local building law
• an inspection with a local roofer or carpenter
• a statement from the local grid operator as to whether feed-in is possible
• the analysis of the own power consumption.

If the requirements are met, we will be happy to make you an offer.