FAQ: The 15 Most Common Questions Our Customers Ask About Photovoltaics

The photovoltaic Q&A that customers most frequently ask always revolves around economics and profitability—understandably, since no one wants to waste money. Structural considerations also come up quickly: Is my roof suitable? Is there enough space? How about the roof’s structural integrity?

Costs are, of course, a major topic, as well as the various financing options and whether—and how—subsidies can be obtained.

Many customers are also interested in electricity generation itself: How much can I actually consume myself? What happens with surplus electricity? And is selling it back to the grid worthwhile?

Practical considerations such as the lifespan of the system, maintenance requirements, and suitable insurance also matter—nobody wants unpleasant surprises.

In short: Anyone considering a PV system wants clarity about investment, benefits, and potential drawbacks, ideally before a single technician climbs onto the roof.

“Didn’t find your answer? Ask our expert directly!”

Finance & Profitability

• Is a PV system really worthwhile?
  It depends heavily on your electricity consumption, investment costs, and current subsidy programs.
• What are the costs?
  Costs vary depending on the system size and chosen components. A flat price is difficult, but a precise calculation is definitely worth it.
• What about payback period?
  The amortization period is a key consideration. Depending on your investment and solar yield, the system can pay for itself after several years—a close look at the numbers is essential.
• Subsidies?
  There are various government programs that can make the investment more attractive. Informing yourself and applying strategically can save real money.

Installation & Requirements

• Is your roof suitable?
  Not every roof is optimal for a PV system. Orientation, slope, and shading play decisive roles.
• How much space do you need?
  Space requirements depend on your electricity consumption and the desired system size. Higher energy demands require more roof area.
• Where can you find specialists?
  Specialized companies handle the professional planning and installation of your PV system. Recommendations can be found through industry directories or personal networks.

Electricity Use and Storage

• What is self-consumption?
  You use the electricity produced by your PV system directly in your home instead of feeding it entirely into the public grid. This saves costs and increases energy independence.
• Do you need a battery storage system?
  From a business perspective, this is often worthwhile. A battery allows you to use more of your self-generated electricity and reduces dependence on rising electricity prices and grid fluctuations.
• What happens with surplus electricity?
  Surplus electricity can easily be fed into the public grid and sold, generating additional income and making your system more efficient.

Operation and Maintenance

• How much electricity does a PV system produce?
  It depends on the system size and the amount of sunlight it receives.
• Do I need to check it regularly?
  Absolutely. Occasional inspections are recommended. Monitoring the system ensures reliable operation and prevents loss of output.
• What about the lifespan of solar modules?
  PV systems typically last at least 25 years, often longer. This makes them a highly sustainable investment over the long term.

Technical Aspects

• What is kWp?
  Kilowatt-peak (kWp) is a unit of measurement for the maximum output of a PV system.
• Are there restrictions on feeding electricity into the grid?
  Previously, there was the 70% rule, which has since been abolished.

This article is intended for informational purposes only and does not constitute a binding offer or professional advice.