Solar system for a commercial building

Why is 2026 a good year to invest in solar power?

Electricity prices for businesses in Serbia have increased by more than 40% over the last 5 years.

At the same time, solar panels and supporting equipment have become more accessible, and more companies are seeking ways to reduce their dependence on rising electricity costs.

That is why investing in a solar power system for a commercial building is now often seen as a long-term solution rather than just an additional expense. Depending on consumption, system capacity, building position, and grid connection conditions, the payback period typically ranges from a few years, while the system continues to produce energy for the next 20–25 years.

For a company with higher daytime electricity consumption, a solar power system can bring significant annual savings and better control over operating costs.

Types of solar power systems for commercial buildings

On-grid system, the most common choice for commercial buildings:

• connected to the distribution grid;
• does not require batteries;
• the most cost-effective solution for companies with continuous daytime consumption;
• surplus energy is delivered to the grid, and the calculation is performed in accordance with current prosumer rules.

Off-grid system:

• completely independent from the grid;
• requires batteries;
• a more expensive solution;
• used for remote facilities and buildings without grid connection.

Hybrid system:

• combines an on-grid system with battery storage;
• provides protection during power outages and helps reduce electricity costs;
• recommended for buildings with critical consumers.

Who benefits most from a solar power system?

A solar power system is most cost-effective for commercial buildings with stable, high daytime electricity consumption. These include, for example:

• production facilities;
• cold storage facilities and warehouses;
• retail stores and supermarkets;
• hotels and restaurants;
• car repair shops and workshops;
• farms and agricultural facilities;
• office buildings with air conditioning, servers, and IT equipment.

The more solar energy is used directly in the building, the more cost-effective the system becomes. That is why consumption analysis is one of the most important steps before preparing an offer.

How is the required system capacity calculated?

The starting point is your average monthly electricity consumption, measured in kWh. The standard formula is:

Required capacity (kWp) = Monthly consumption (kWh) / 130

Example:
A company with monthly consumption of 5,000 kWh needs a system of around 38 kWp. Before every offer, Inmatik performs a detailed consumption analysis and prepares a proposal for the optimal system.

ROI calculator — savings by year

*Prices, savings, and payback periods are approximate and provided for informational purposes only. The exact return on investment depends on the consumption profile, electricity price, system capacity, roof position and orientation, equipment quality, calculation method, and current grid connection conditions. Available incentives and support programs may further shorten the payback period.

Subsidies and incentives in Serbia

The availability of subsidies and incentives depends on current public calls, the type of user, and the building's purpose. That is why it is important to check the conditions before making an investment decision.

• Households may occasionally be eligible for non-refundable funds through energy efficiency programs.
• Entrepreneurs and small and medium-sized companies can follow credit lines and development programs that support investments in energy efficiency and renewable energy sources.
• Prosumers can use the generated energy for their own consumption, while surplus energy is delivered to the grid and calculated according to current rules.
• Local municipalities may occasionally publish additional support programs, so conditions can differ from one municipality to another.

Inmatik can help with checking technical conditions, preparing documentation, and managing the process from initial analysis through system connection to the grid.

What does the process with Inmatik look like?

1. Free consultation and consumption analysis

   First, we analyze your electricity bills, monthly consumption, and facility operations. The goal is to determine whether a solar power system is cost-effective and which capacity makes the most sense.

2. System design and detailed offer

   Based on consumption, available surface, roof orientation, and technical conditions, we propose the optimal solution and prepare an offer.

3. Preparing the required permits and approvals

   We help prepare the technical documentation and manage the procedure with the relevant institutions and the distribution system operator.

4. Installation of solar panels and inverters

   After approval and agreement, we install the panels, inverters, protective equipment, and supporting electrical installations.

   If the building requires additional work, Inmatik can also perform the necessary electrical installations so the system is properly connected and safe to use.

5. Grid connection and commissioning

   The system is connected to the grid, tested, and prepared for regular use.

6. Delivery of documentation and warranties

   At the end of the process, you receive technical documentation, user instructions, and warranties for the installed equipment.

Contact Inmatik if you are considering switching to a solar power system for your commercial building. We will analyze your consumption and suggest a solution that makes the most sense for your building, budget, and way of working.

FAQ

1. Do I need a building permit for a solar power system?

   The procedure depends on the system capacity, building type, building purpose, existing connection capacity, and the conditions set by the distribution system operator. For smaller rooftop systems, the procedure is usually simpler, but it is still necessary to check the technical conditions, grid connection requirements, and the installation of a suitable metering point. That is why Inmatik checks the specific conditions for each building and prepares the required documentation before every project.

2. Which solar panels are the most reliable for commercial use?

   For commercial buildings, high-efficiency monocrystalline panels are most commonly used because they provide a good balance among power output, required surface area, and long-term performance. It is important to choose equipment from proven manufacturers, with clear product and performance warranties. Inmatik recommends equipment based on the building's needs, expected consumption, and the investor’s budget.

3. What happens with surplus electricity?

   If the system produces more energy than the building is using at that moment, the surplus is delivered to the distribution grid. The calculation method depends on the prosumer status, user category, and the current rules of the supplier and system operator. With hybrid systems, part of the surplus energy can be stored in batteries and used later, for example, at night or during a power outage.

4. How long do solar panels last?

   High-quality solar panels typically have a 25- to 30-year service life. Their efficiency gradually decreases over time, but even after 25 years, quality panels can still operate with a large part of their initial power. Regular system monitoring and professional installation have a major impact on long-term reliability.

5. Does a solar power system work when there is no electricity in the grid?

   A standard on-grid system automatically shuts down during a power outage for safety reasons. If you need power for critical consumers during outages, then a hybrid system with batteries and suitable protective equipment should be considered.

6. Is a solar power system cost-effective if the company works mostly during the day?

   Yes. Commercial buildings with the highest daytime consumption often have the greatest savings potential because the generated solar energy is used immediately within the building. This reduces the amount of electricity purchased from the grid and improves the system's overall cost-effectiveness.