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SOLSUM PRO – tailor-made power

Home power kit - greater efficiency and faster return on investment through yield optimization

SOLSUM PRO is a home photovoltaic power plant connected to the grid for providing electricity to the home all year round. Each photovoltaic installation is different and each is designed with special care. SOLSUM PRO are efficient sets based on years of experience in equipment selection providing extended warranties, lower power drops and increased efficiency in low sunlight.

High-end module

Award-winning module




1. PERC-coated cells

PERC, or Passivated Emitter Rear Cell

Photovoltaic modules made with polycrystalline silicon technology, using passivation of the rear cell wall, have higher module efficiency by increasing solar absorption efficiency. The back passivation causes sunlight passing through the cell in the wavelength range of 1000 to 1180 nm to reflect off the back reflective layer, directing photons back into the cell. Thus, radiation, which is lost with standard cells, becomes an additional source of electricity when using cells with bottom passivation. In addition, the PERC layer lowers the temperature of the working cell (as is well known, the high temperature of photovoltaic cells reduces energy production). With this technology, the module achieves higher energy yields due to more efficient absorption of solar radiation.

Slide 1

A video demonstrating this technology:

A measure of REC’s photovoltaic module evaluation is also provided by the results of an independent laboratory test conducted in Aachen, Germany. The subject of the study was the measurement of current/voltage (IV) characteristics at the module’s output. On average, REC’s polycrystalline modules generated more electricity than each of the 45 modules from other manufacturers tested. REC’s products outperformed 45 different other types of modules in the same technology, thin-film and monocrystalline.


2. Division of the module into 2 sections

With standard modules, even with a little shade, parts or all of the module stops working. In the best case 33.3% of the module does not work and in the worst case, depending on how the shadow falls, even the whole module does not work. Twin Peak modules use a division of the module into 2 sections, which results in a 16.6% higher energy yield when the shadow falls on part of the module, e.g. through a leaf or a chimney (figure below):


       Standard module                                                         REC Twin Peak

If the lower surface of the module is shaded, e.g. by snow or is too close to the next row, Twin Peak achieves 50% more production than a standard panel (pictured below)

twin peak

Thanks to the use of such a division, the photovoltaic module achieves higher energy yields and also it gives the possibility to design modules in places where there is partial shading, e.g. through antennas/masts, and there is no other possibility of siting the modules.

3. 120 cells instead of 60 from the same module area

By laser cutting standard cells in half, we have 120 cells instead of 60, resulting in a reduction in the cells’ internal resistance, higher power output and improved performance in various solar conditions, as well as an increase in the cells’ resistance to micro-cracks.

twinpeak_silver_top_1 (1)

It is also worth noting that REC modules more than double the IEC test standards and are subjected to the most stringent quality controls.

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Above: multiple load tests to which the module is subjected.

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Above: hail impact test verifies whether a photovoltaic panel can withstand a hail impact at ~ 4 ° C. (Hail impact test).

4. Four busbars

On each cell there are 9z thin rails (busbars) through which current flows. The use of 4 busbars instead of 3, as in standard modules, shortens the path the electron must travel and also reduces internal resistance and allows better current flow. By being able to use thinner tracks, moreover, the coverage of the cell is reduced. An additional advantage is the increased mechanical strength of the module against snow and wind.

Below is a visualization of electron flow and capture: on the left a standard cell, on the right REC Twin Peak. 


 bus bars

5. Rozdzielenie junction-box’a

5. Junction-box separation

Another innovation of Norwegian engineers is the separation of the junction-box into 3 parts (photo of the back wall of the module below). In standard modules one junction-box is installed. Thanks to the solution used in Twin Peak modules, the temperature of the wires has been reduced, the cooling of by-pass diodes has been improved and the failure rate of these components has also been reduced.


6. Awards

At the world’s largest and most prestigious PV industry trade show INTERSOLAR in Munich, REC won the competition against other major global PV companies by winning recognition and 1st Place in the “Photovoltaics” category for its TwinPeak series of products.


REC is a leading European company in the solar panel market, which celebrated its 20th anniversary in 2016. Through its integrated production of polysilicon, wafers, solar cells and panels, and the provision of turnkey solutions, REC is helping to meet the world’s growing energy needs. Founded in 1996, REC is a company owned by Bluestar Elkem, headquartered in Norway and with operational headquarters in Singapore. REC concluded 2015 with 2,000 employees worldwide, a production capacity of 1.3 GW and revenues of $755 million.

Data sheet of the REC Twin Peak module

The official distributor of REC Group modules, including the Twin Peak series, in Poland is SOLSUM sp. z o.o. 

Advantages of SOLSUM photovoltaic system

More efficient than ever before

Professional installation

Our team consists of specialists with many years of experience in the field of energy and photovoltaics successfully implementing demanding projects – often the first in Poland. After installation and configuration, we also carry out arrangements with the local operator to meet the requirements and connectivity to the grid.

Customized design

SOLSUM PRO is a custom-designed set – we are flexible when it comes to solutions but uncompromising when it comes to quality. We also know how important efficiency is, so in order for your power plant to work at its best, an individual and well-thought-out design is necessary, which includes selection and current-voltage configuration of the installation, accurate energy yield and rate of return calculations and design of roof slope development with shading analysis. Only a professionally designed installation means safe operation and maximum efficiency throughout the operating period.

Non-refundable grant 40%

If you plan to live ecologically, save money and take care of the immediate environment, then we will obtain a 40% non-refundable subsidy for your home photovoltaic power plant. Formalities and handling of the entire investment with financing is our specialty.

Complete service

We value your time, which is why the formalities of design, financing, execution and acceptance are worth outsourcing to professionals who will take care of every aspect of the project from start to finish. We take care of every step to ensure quality and efficient handling of the investment and a quick return on investment – that’s why we are a leading company in the industry.

More savings

If you pay more than 100PLN per month for electricity, then a photovoltaic system will allow you to make significant savings on your electricity bills. The undeniable fact is that the price of traditional energy will increase year by year, so by installing a photovoltaic set now and using the energy for your own needs you will save money from day one for as long as 30 years. The payback period for the investment is 5-6 years, and the total savings with 25 years from a home photovoltaic system is about 215000PLN taking into account the increase in energy prices.

More energy from each module

The solar panels used in our installations deliver more power from each square meter due to several design improvements. The introduction of three rails to improve contact between the cell has improved electrical flow increasing the cell’s power output and reducing current flow losses.

25 year warranty

Investment in SOLSUM PRO is an investment for years. The operating time of this power plant is about 25-30 years. For peace of mind, the guarantee is 25 years for energy yields.

Silver-framed module with attention to detail

Combination of glass, aluminum and silicon

Silver anodized aluminum frame for maximum weather resistance. Power encased in a beautiful frame.

solar module

How does the SOLSUM PRO home photovoltaic system work?

Video showing how to simply get energy from the sun

Flexibility in construction – designed for any type of roof surface

For the most challenging applications

Thanks to independent power tracking points, the system can be installed on slopes with different degrees of inclination, which will not adversely affect the overall efficiency of the installation.

Series of inverters for home power plants

Designed for durability




ABB’s three-phase inverter family is a full range of high-efficiency equipment with a 25-year service life.

Mounting system for any type of roof

Mounting system with a 10-year warranty



Why choose SOLSUM?

  • Many years of experience in the implementation of photovoltaic projects from design to service
  • Proven company – thousands of customers in Poland have trusted us
  • Only 100% original products that guarantee fast return on investment and high quality of energy yields
  • Comprehensive investment service
  • Area of operation covers the whole of Poland
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Clients about us:

“We recommend SOLSUM as a reliable ad credible company”.

Piotr Sroka, Manager of WABCO POLAND, Wroclaw

“The work entrusted was carried out in a fully professional manner”

Stanislaw – owner of an 8.58kWp installation, Ludźmierz

Formularz instalacji

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