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300693
Croatia's energy transition is gaining momentum, driven by the need for greater energy independence and grid resilience.
According to the OECD Economic Outlook published in June 2026, imported fossil fuels meet approximately 60% of Croatia's energy needs, exposing the economy to global energy price volatility. In April, electricity, gas and fuel prices increased by 11.3% year-on-year, highlighting the country's vulnerability to external energy shocks.
Against this backdrop, renewable energy expansion and increasing demand for grid flexibility are creating new opportunities for battery energy storage systems (BESS).
Croatia's BESS market is expected to expand significantly, with projected capacity rising from approximately 11 MW to 150 MW by the end of 2026. Government support and growing investment interest are further accelerating the country's energy storage development.
Yet as projects move from planning to deployment, one critical question emerges: How can BESS maintain long-term reliability in Croatia's demanding coastal environments?
Stretching along the Adriatic Sea, Croatia's coastline presents distinctive operating challenges for energy infrastructure.
Salt-laden air, high humidity, water exposure and corrosion risks can affect electrical equipment, potentially increasing maintenance requirements and long-term operating costs.
For BESS developers and EPCs, reliability goes beyond power conversion efficiency or grid compliance. Environmental adaptability is equally important to equipment durability, project availability and lifecycle performance.
SINEXCEL's response combines two essential capabilities: robust protection and local support.
Reliable performance in demanding environments begins long before equipment reaches the project site.
At SINEXCEL, environmental reliability is addressed through a systematic engineering and validation process:
01 | SELECT — Materials & Components
Material and component selection considers environmental exposure, equipment durability and application requirements from the earliest stages of product development.
02 | CUSTOMIZE — Application-Specific Test Conditions
Testing requirements are developed around real-world operating scenarios, including coastal environments, extreme temperatures and seismic conditions.
This application-oriented approach helps align engineering validation with the challenges equipment may encounter in the field.
03 | VALIDATE — Rigorous Laboratory Testing
Products and protective systems undergo laboratory testing to evaluate their performance under defined environmental conditions.
For coastal applications, two important areas are ingress protection and corrosion resistance.
IP65 Ingress Protection
8-hour dust test
IPX5 water-jet test
No dust or water ingress observed during the specified tests
C5-M Corrosion Resistance
Testing in accordance with ISO 12944-6
720-hour salt-spray test
480-hour condensation test
No blistering, peeling or flaking observed on the tested protective coating
Together, these tests provide evidence of environmental protection performance against dust, water exposure, humidity and corrosive conditions.
Environmental reliability extends beyond corrosion and ingress protection.
As BESS applications expand across different climates, operating temperature capability becomes another important consideration for equipment selection.
SINEXCEL's PCS portfolio demonstrates performance designed for demanding temperature conditions:
Sirius 135K — Low-Temperature Operation
SINEXCEL Sirius 135K: −40°C normal operation
Reference conventional PCS: −20°C normal operation
StellaON 1250K / 1575K — High-Temperature Performance
SINEXCEL StellaON: 50°C full-power operation
Reference conventional PCS: 45°C normal operation
These capabilities highlight the importance of designing PCS solutions around diverse operating environments, from cold climates to high-temperature installations.
For Croatia's coastal BESS projects, the combination of environmental protection and temperature adaptability offers additional confidence when evaluating long-term equipment reliability.
Technical protection is only one part of project reliability. Local service capabilities are equally important when projects enter commissioning and long-term operation.
SINEXCEL has established a European service network comprising:
1 German subsidiary
4 regional service centers and stations
4 local service partners
Dedicated local team members
This regional infrastructure supports project coordination, technical assistance, commissioning and after-sales requirements.
For developers and EPCs operating in emerging BESS markets, accessible service resources can help reduce operational uncertainty and support more efficient project execution.
By combining engineering expertise with European service capabilities, SINEXCEL aims to deliver reliability throughout the project lifecycle.
SINEXCEL's presence in Croatia is already translating into tangible business progress.
The company has secured more than 40 MW of PCS orders in the Croatian market, featuring its 1250 kW and 1725 kW PCS solutions.
Compared with Croatia's projected year-end 2026 BESS capacity of approximately 150 MW, this order portfolio represents the equivalent of around 27% of the projected market capacity.
The figure reflects the relationship between SINEXCEL's secured orders and the projected national capacity, rather than an installed-capacity market share. Relevant projects are targeted for commissioning by the end of 2026.
These projects illustrate how environmental protection, systematic testing and local service support can help translate market opportunities into practical energy storage deployment.
Croatia's BESS development reflects a broader transition taking place across Eastern Europe.
As renewable energy penetration increases and grid flexibility becomes more important, developers must consider not only system performance and project economics, but also environmental durability, engineering validation and long-term service support.
Through its PCS technology, environmental testing capabilities and expanding European service network, SINEXCEL continues to support the development of reliable energy storage infrastructure across the region.
SINEXCEL | Powering Eastern Europe's Grid Resilience
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