.KWARTZ is a Polish EPC contractor that handles both the engineering and the economics of energy projects: analysis, design, delivery, and operations and maintenance (O&M) of solar PV from 50 kWp to 10 MWp, battery energy storage (BESS), reactive power compensation and electrical installations.
The free Energy Review provides a Savings Map.
We start with your business goal and compare options, assessing their technical and financial conditions before design starts.
We check what really drives your energy costs and which scope of investment is justified technically and financially. We analyse PV, battery storage, reactive power compensation, the grid connection and electrical installations as one system.
We deliver rooftop and ground-mounted PV on an EPC basis (engineering, procurement and construction), work with financing partners and have 10+ MW under O&M. After an audit, we can also take on O&M for selected installations built by other contractors.
.KWARTZ Construction helps prepare a free installation quote for your bid, then designs and builds the agreed PV, BESS and electrical scope as a subcontractor. Kwartz Sp. z o.o. handles enquiries and enters into contracts with general contractors. Scope and responsibility are agreed before the quote.
Not every company needs every technology. The scope depends on how the site operates, its energy costs, grid connection and infrastructure, and the aim of the investment.
Rooftop and ground-mounted, 50 kWp–10 MWp. Capacity and layout follow the consumption profile, self-consumption, the roof or ground and the grid connection conditions.
See the service → 02 · BESSWe first define the battery’s job: managing demand peaks, working with PV or powering selected circuits.
See the service → 03 · kvarWe analyse the reactive power charges and take measurements, then match the system to the type of load and the operating conditions.
See the service → 04 · ElectricalDesign, grid connection, switchboards, testing and upgrades within the scope agreed for each site.
See the service →Scoped to the decision: economics, roof or ground, installation and grid connection, formalities. The result sets out options, assumptions, risks and missing data.
See the scope → O&MMonitoring, inspections, electrical testing, thermal imaging and response to performance deviations. After an audit, we also take on O&M for installations built by other contractors.
See the scope →An alternative for some sites: when the car park offers better conditions for PV than the roof, or should serve an additional function.
See solar carports Multi-site scaleFor boards and technical teams comparing options across a plant or a portfolio.
Go to solutions for industryUsing your invoices, a 15-minute load profile (interval data from your meter, if available) and site constraints, we show whether PV, battery storage, reactive power compensation or electrical work is worth analysing. The Review ends with a Savings Map with figures calculated for your plant. If the initial option has constraints, we compare changes in scope, technology, phasing or financing and agree the next step.
Invoices, the load profile if available, site data, the contracted capacity agreed with the distribution system operator (DSO) and grid connection details.
A Savings Map: figures calculated for your plant, a list of missing data, assumptions and constraints, and the next step (a feasibility study, an energy strategy or delivery).
A feasibility study, design or final price. The figures are a calculated starting point, not a guaranteed saving.
Selected projects: Makrum, Danmis and Neuca. Forecasts are kept separate from measured results.
PV with battery storage. A forecast for the stated assumptions, not a measured result.
Expected payback period: approx. 3.9 years
PV, a 261 kWh battery energy storage system and integration with a generator set for selected circuits.
Battery switching time stated in the manufacturer’s datasheet: 10 ms.
Power for selected critical circuits
Solar carports on an operating car park at the company headquarters. The carport comprises 1,428 modules and a connection to the medium-voltage grid.
approx. 671 kWp · Toruń · in progress, 2026–2027
200 kWp + 261 kWh battery storage · 2025
The plant and its PV system. The completed scope also included battery storage and generator integration for selected circuits.
View project details (in Polish)
Existing site infrastructure
View of the site and its existing infrastructure. The new solar carport project, approx. 671 kWp, is in progress in 2026–2027.
View project details (in Polish)
Industry membership.KWARTZ is a member of DAFA, the Polish association of flat roof and façade contractors
What is DAFA (in Polish)Quotes translated from Polish.
“Cooperation ran smoothly, and the contractor demonstrated a high level of organisation, technical competence and professionalism at every stage of the investment. We recommend Kwartz Sp. z o.o. as a reliable and trustworthy partner for photovoltaic projects delivered on a design-and-build basis.”DOZAMEL Sp. z o.o. · 1,499.85 kWp · EuroPark Kobierzyce
“We recommend the services of Kwartz Sp. z o.o. as reliable, punctual and well organised.”FAB Investment · 2.2 MW · two ground-mounted farms
“The above works were carried out to the highest standards and within the agreed deadlines.”Energia Pokój 1 Sp. z o.o. · 3 MWp · three ground-mounted farms
“We recommend Kwartz Sp. z o.o., based in Wysogotowo, as a reliable and professional PV installation contractor.”Qemetica Polyurethanes · 357 kWp · Bydgoszcz
Each video answers one question that comes up before a technical or investment decision.
Responsible for energy strategy, discussions with management boards and the link between technical decisions and investment economics.
Video in Polish with English subtitles.
My name is Faustyn Wiśniewski and I am the CEO of Kwartz. We are a general contractor for solar PV installations, and we design renewable energy systems for businesses. We do this for companies, for groups, for any organisation that uses energy: to help it run better, to cut its costs, both energy and distribution charges, and to manage its energy and make the most of it.
In the end, what drives me, and what we bring to our clients, is the fight for their margins, for the part of the business that earns money. We prepare each investment so that the economic case is as strong as possible for the client.
Responsible for installation work, electrical testing, safety, maintainability and technical decisions that affect long-term operation.
Video in Polish with English subtitles.
On a roof, the lightning protection system (LPS) and the PV system are essentially two separate systems. Some designers act as if there were enough room for the PV system to fit. The modules keep the separation distances, but the cable routes and trays do not. So the installation as a whole does not have the distances it should.
What does that mean in operation? If lightning strikes, and it can, this approach can prove very costly. It can destroy the whole installation: modules, optimisers and inverters.
Scope, responsibilities and required data are confirmed before each stage starts.
We analyse consumption profiles and energy supply terms. We show what to change in the way you buy energy and when investment in on-site generation is justified.
Explore energy strategy and pre-investment analysis →Projects up to 10 MWp, covering design, grid connection, transformer substations, installation and acceptance.
See a ground-mounted farm project →We specialise in industrial solar PV from 50 kWp to 10 MWp, rooftop and ground-mounted, on an EPC basis. We take on smaller projects when they are part of a wider package, for example PV, reactive power compensation and a switchboard upgrade.
For installations above 50 kWp, the full cycle usually takes approx. 6–12 months. The exact schedule depends on capacity, the grid connection, the roof, fire safety requirements, component availability and the lead times of the distribution system operator (DSO). Projects with battery storage may need additional technical arrangements.
Yes. Depending on the scope, we help with DSO procedures, obtaining grid connection conditions, agreeing fire safety requirements, discussions with the insurer and technical documentation. At the outset, we agree what .KWARTZ handles and what needs the client’s involvement.
Yes. We work with financing partners and help you compare six models: a power purchase agreement (PPA), a virtual PPA (vPPA), PV as a service (PVaaS), an energy service company (ESCO) contract, subscription and leasing. For grants, we prepare the technical input for your adviser; availability depends on the project and current programmes.
After a condition audit, electrical testing, a documentation review and a risk assessment, we can take on O&M for selected installations. Not every installation can be safely covered by O&M without prior repairs or completed documentation.
We organise the information and run the numbers for your plant. The Savings Map shows the figures, the data gaps and the right next step.
We reply within 24 hours.
