We offer professional solutions for business in the field of photovoltaics. Our projects include large solar power plants and roof-mounted photovoltaic modules. We adjust the power and the selection of panels depending on the place of installation, the angle of inclination and the topography.

Reduce your business costs and save on electricity bills. We offer proven and tailored solutions for your company.

Every company is different and needs a tailor-made solution. We are open to your expectations. That is why we carefully analyze the needs and installation possibilities in a given area. On this basis, we select the appropriate devices of the highest class, create a project and work schedule, including assembly made in full accordance with the art.



    We support the adaptation of the photovoltaic installation to the company’s needs in terms of products and technology.
    We help in the preparation of documents related to the connection of a photovoltaic installation for companies to the distributor’s network.
    We give you our knowledge when applying for co-financing, loan or leasing for the construction and commissioning of PV installations


The energy report is a series of detailed analyzes allowing to identify solutions aimed at increasing the company’s energy efficiency.

The conducted research covers issues related to the power profile, technical potential and the current conditions for the purchase and distribution of electricity.


We carefully examine anomalies and deviations in the power profile. We check whether the company’s technological cycle is optimal. During in-depth analysis, we obtain accurate information whether changes to the process shift can bring benefits and positively affect the power profile.

We also check if there is a problem with exceeding the power. If there is such an effect, we examine when it occurs and whether it is related to a specific technological cycle.


We check how big is an actual need for electricity. The answer to this issue allows to determine what power the RES installation will provide the required energy. We also take into account whether there are technological obstacles that prevent the construction of an installation with the expected power. It is also very important

It is also very important to select the power of the energy storage. The examination covering this issue allows us to answer the question of whether there are technical and economic reasons for the use of an energy storage. The results of the analysis also help in determining which warehouse will be the most optimal.


As part of the applicable conditions for the purchase and distribution of electricity, we are examining the applicable tariff. We check the share of individual tariff components and how they are affected by the RES installation. We also help you decide whether the applicable tariff is the most beneficial for your company.

The analysis also covers the costs ofpurchasing electricity. We check the current prices of electricity on the market. These data make it possible to answer the question of how the current conditions for purchasing electricity compare with the price.


The scope of documentation required to build a PV installation depends on its power. In the case of investments for which the installation will be made with a capacity of up to 50 kWp, no permits are required. The receipt of such an installation takes place upon notification.

The situation is different when the investment concerns installations with a capacity of more than 50 kWp. According to the new regulations resulting from the amendment to the act of October 30, 2021, installations with a capacity of up to 500kW are considered small installations.

In their case, the following permits are required:

  • building permit
  • installation connection conditions or guidelines from the power company regarding the implementation of a system limiting the energy flow to the grid.

It is worth paying attention to the fact that Installations up to 500 kW do not require the investor to have documents related to the spatial development of the area (Study and Local Plan).

This concession also applies to installations with a capacity of up to 1 MW if they are built on class V and VI land, as well as wastelands.

Otherwise, for installations over 500 kW it is required to have documents related to spatial development of the area.

It is also worth noting that the roof installations do not require any changes to the spatial development plan or a study. Also in terms of concessions, it is required for installations from 1 MW.


On this page you will find answers to frequently asked questions related to the work of our company and issues related to photovoltaics and solar energy. All questions and answers are guidelines only, not guidelines.

1. On what basis do you adjust the installation to the customer's needs? arrow

During the preparation of documentation, each installation is verified on the basis of invoices and electricity readings at 15-minute intervals. On this basis, we define the power profile and demand.

2. I have membrane roofs - can I place an installation there? arrow

Yes, but such an installation should be made using structures dedicated to this type, it can cover – ballast structure or welding.

The least problematic are wooden, reinforced concrete or monolithic roofs due to the permissible additional load

3. What permits do I need to get to start building a 1MW roof / ground installation? arrow

An environmental approval is required prior to construction commencement . This document is issued by: Woda Polskie, Sanepid, RDOŚ and the Sanitary Inspection.

It is also necessary to have the building conditions as well as the connection conditions and the connection design. In this regard, expert knowledge is required for this application and design works prepared in advance.

The construction of the investment cannot begin without the possession of a construction design and a building permit.

4. Is an on-site inspection necessary? arrow

Yes. This is absolutely one of the most important implementation points. The reason why it is necessary is that each case is different. During the on-site inspection, we check, among other things, the structure of the data or the place of connecting the installation to the network.

We also encourage you to check our subpage What kind of land for PV farms? in which we describe the detailed requirements for land for PV investments.

5. What kind of service do you guarantee? arrow

  • Test of earthing resistance and equipotential bonding,
  • Tests of DC circuits,
  • Test of open circuit voltage VOC DC,
  • Test of the current of the ISC DC short-circuited circuit,
  • Testing the insulation resistance of AC and DC LV circuits,
  • Testing the current-voltage characteristics of strings of photovoltaic modules,
  • Thermal imaging camera tests of electrical connections, photovoltaic modules
  • junction boxes, etc.
  • Cutting grass (ground),
  • Washing photovoltaic panels,
  • Measurement of the tightening torque of modules, structures and cables in transformers, inverters and
  • and distribution boxes,
  • Topping up transformer oil (if necessary),
  • Checking fire fighting equipment.

6. What is the warranty period for components? arrow

The warranty periods are determined by the manufacturers of the components used. The warranty period is as follows:

  • For photovoltaic modules, under the terms of the manufacturer’s warranty, a 12-year warranty
  • for the mechanics and 25-year line warranty for the power.
  • For the inverters, according to the producer’s warranty conditions, 5-year warranty.
  • For perforation of the assembly structure, in accordance with the terms of the manufacturer’s 10-year warranty.
  • For other components, in accordance with the manufacturer’s warranty terms.

7. How often the modules must be washed arrow

If there are no extraordinary circumstances, no more than twice a year

8. What kind of warranty is given by Helios? arrow

According to the contract for the performed construction works, Helios provides a warranty for a period of 2 years from the date of signing the Final Acceptance Protocol.

9. What are the main benefits of having a PV installation? arrow

Building your own PV installation brings many advantages and benefits, the most important of which, in our opinion, are:

  • Improving the energy efficiency of the company.
  • Independence from growing energy prices.
  • Conscious and responsible Environmental Friendly Company.
  • Return on investment in 4 years, then pure profit.
  • Long lifetime of the panels up to 25-30 years.
  • Maintenance-free installation.
  • Smaller variable premiums from the distribution part.
  • Reduction of peak peak power consumption, which may lead to the possibility of reducing the contracted capacity.
  • Environmental protection and reduction of CO2 emissions, reduction of your carbon footprint

10. What is the annual profit from owning the installation, after the return on investment on the example of 1 MW on the roof? arrow

The benefits of operating such an installation, assuming the purchase price of energy at the level of PLN 450 / MWh, amount to approximately PLN 450,000 per year for the purchase + additional PLN 150,000 for distribution minus maintenance costs.

It is worth noting that the roof-mounted installation has lower maintenance costs due to the lack of the need to mow the grass or protection, and amounts to about PLN 50,000 per year.

11. What are the annual costs of operating the installation on the roof and on the ground? arrow

The annual cost of maintaining the installation on the roof is PLN 50,000.

The cost of the installation on the ground is PLN 110,000 per year. Here are added elements such as lawn cutting, monitoring, security, real estate tax, lease.

12. What additional load does the roof have to withstand with the PV system? arrow

An average of 15 kg / m2 for a flat roof – in the case of ballast concrete block structures. For a pitched roof, an average of about 13 kg / m2.

13. We have land, but apart from our location, for example in another voivodeship - can we use it? arrow

Yes, absolutely, you can. Please visit our subpage What about the energy

14. Can we purchase cheaper energy from Helios without having our own farm, but from your power plant? arrow

In the case of availability, it is possible.

15. When does a 1 MW investment on a roof in a company pay off? arrow

In business, this period is about 4 years, but taking into account the soaring energy prices and additional fees – for example, the power fee, this period is still shortening.

16. Who will handle all formalities and permits? arrow

At Helios, we approach the subject comprehensively, providing solutions, not problems. Therefore, we take care of all formalities.

17. What is our experience? arrow

Helios Strategia has been operating since 2007. Since 2017, we have been actively involved in the sustainable development of solar energy in Poland.

18. How many power plants have you built so far? arrow

So far, we have built on a turnkey basis power plants with a total capacity of over 450 MW. As subcontractors, we have built installations with a total capacity of 1 GW.

19. How many installations have you built in Poland? arrow

So far, we have made 39 installations in Poland. Their number is constantly growing.

20. What roof area is needed for 1MW? arrow

It all depends on many factors, for example the number of skylights, lightning protection systems, chimneys and air conditioners. Very generally, it can be assumed that to obtain 1 MW of power, you need from 14,000 m2 of roof.

21. Do you have any references? arrow

Of course, please visit our website with References 🙂

22. How long will it take to build an installation with an exemplary power of 1MW? arrow

The construction time of such an installation is approximately 3 months on average.

Do you have additional questions or concerns? Please contact us, our experts will explain to you all issues related to the construction of your own PV farm.


By resigning from a photovoltaic installation on the ground in favor of a roof installation, first of all, we do not involve any additional space. This can potentially be used for other types of development. We also exclude the fulfillment of all land requirements, which we have described in detail on our subpage What kind of land for PV farms?

We also eliminate the likelihood of building additional transformer stations, which is associated with additional costs and the need for additional land. The construction of additional transformer stations most often takes place in the case of greater distances between the generating source and the place of its connection to the network.

In the case of roof installations, shorter cable lines with smaller cross-sections are designed, which has a direct impact on their price. In the case of roof installation, the following elements are also dispensed with:

  • Geotechnical research
  • Fence, lighting and video surveillance,
  • Heavy equipment for driving the structure and making trenches at the construction stage.


At the stage of operation of the installation, the costs related to:

  • Property and land tax
  • Cutting the grass
  • Security


Each roof installation forces the adaptation of the structure to the additional load which is the structure and photovoltaic modules. Therefore, nowadays, in newly constructed buildings, installation is often included already at the design stage.

There are two main types of roof structures on the market: ballast and mechanically fixed to the roof.


Our company primarily tries to use ballast structures. We choose systems from those manufacturers who design their structures assuming a minimum additional ballast load of 13-15 kg / m2 and a 20-year warranty.


In places where it is not possible to use ballast structures, we use mechanically mounted. They are used in 100% of pitched roofs, but also on flat roofs where the permissible weight is less than 13 kg / m2