Croatia Dubrovnik Hotel Rooftop PV (2024)

In 2024, we successfully completed the wire export supply for the Croatia Dubrovnik Hotel Rooftop PV Project, providing a full set of high-quality photovoltaic wire solutions for this commercial rooftop photovoltaic system. We helped the customer achieve green energy transformation, and at the same time, relying on professional services and compliant certifications, we successfully solved multiple difficulties in the implementation of local photovoltaic projects in Croatia. Focusing on the commercial photovoltaic field, this project mainly supplied three core products: Photovoltaic Cables, Low-voltage Cables and Control Cables, all of which fully complied with EU standards, balancing practicality and durability, and becoming a high-quality case of Chinese wire exports to the Croatian photovoltaic market.

I. Croatian Photovoltaic Market Opportunities and Customer's Core Needs

As an EU member state, Croatia is in a critical transition period from the early development stage to the growth stage of the photovoltaic market. The government has introduced a series of incentive policies such as net metering systems and feed-in tariffs for renewable energy, encouraging commercial and industrial electricity users to build distributed photovoltaic systems for self-consumption. Small-scale rooftop photovoltaic projects have become the mainstream trend in the market. According to statistics, Croatia has an annual sunshine duration of 2,000 to 2,700 hours, with abundant solar energy resources. The government plans to increase the proportion of renewable energy in the energy structure to 42.5% by 2030, providing broad space for the development of photovoltaic projects.

The Dubrovnik Hotel cooperating this time is located on the Adriatic coast. It planned to build a distributed photovoltaic system on the hotel rooftop to meet the hotel's daily electricity needs, reduce operating costs, respond to Croatia's green transition policy, and enhance the hotel's environmental image. However, the customer faced multiple pain points in the project advancement, which hindered the project implementation: first, the local policies are gradually opening up, but the approval cycle is long and unstable, and the subsidy application and net metering registration processes are complex, and the customer lacks relevant experience; second, the hotel rooftop space is limited and the layout is complex, and as a commercial building, the rooftop load-bearing capacity has strict requirements, so it is necessary to maximize the use of space to improve power generation efficiency; third, Dubrovnik is a coastal area, and the rooftop photovoltaic system is long-term exposed to strong ultraviolet rays, wind, rain and other outdoor environments, so the customer is worried that ordinary cables are prone to aging and short service life, which will affect the long-term stable operation of the system; fourth, the rooftop is uneven, the inverters and combiner boxes are scattered, making wiring difficult, and the local construction team is not familiar with the installation specifications of photovoltaic special cables; fifth, the distributed photovoltaic grid connection process is complex with many access restrictions, and there is a concern that the power generation cannot be smoothly connected to the grid, affecting the economic benefits of the project.

After comparing multiple suppliers, the customer finally chose us. The core considerations are that we have complete product certifications, rich experience in undertaking similar projects, fast delivery guarantee, and can provide one-stop solutions from policy consultation to construction guidance, which can fully solve their core pain points.

II. Customized Cable Combination Centered on Project Needs

The smooth advancement of the Dubrovnik Hotel Rooftop PV Project is inseparable from the support of cables that are suitable for the scene, compliant with standards, efficient and durable. Combined with the project's coastal outdoor environment, complex rooftop layout, difficult wiring and local compliance requirements, we customized a full set of cable combinations of "DC photovoltaic transmission + AC grid access + control signal transmission" for the customer. The three products perform their respective duties and accurately match the needs of each link of the project. They not only meet EU certification standards, but also solve the core pain points of the project, forming a distinct difference from ordinary cables, which has become the key reason for the customer to choose us.

To meet the core power transmission needs between the hotel rooftop photovoltaic modules, inverters and combiner boxes, we first selected 4 mm²  H1Z2Z2-K Cables, whose core function is to achieve efficient transmission of electricity generated by photovoltaic modules, reduce power loss, and lay the foundation for the stable operation of the entire photovoltaic system. Considering the strict requirements of local project approval in Croatia, this  H1Z2Z2-K cable has passed the dual authoritative certifications of TUV and UL4703, with the TUV certificate number B 126326 0001 Rev.00, which can be directly adapted to the compliance acceptance of photovoltaic projects in Croatia and the EU. This is also its core advantage different from ordinary cables—ordinary cables lack photovoltaic-specific certifications, cannot pass local approval, and are difficult to adapt to long-term outdoor working conditions. Combined with the characteristics of high temperature, high humidity and strong ultraviolet rays in coastal Dubrovnik, the cable is made of high-quality weather-resistant materials, with multi-strand oxygen-free copper conductors, which have excellent electrical conductivity and low resistance loss; the insulation layer is made of UV-resistant and high-temperature-resistant materials, with a working temperature range of -40℃ to 90℃, which can perfectly adapt to the local climate and will not age or crack when exposed to the outdoors for a long time; the black UV-resistant sheath has both waterproof and anti-corrosion functions, which can effectively resist the erosion of wind, rain and salt spray, with a service life of more than 25 years, far exceeding the 10-15 years of ordinary cables. At the same time, its moderate flexibility is also convenient for wiring in the complex layout of the rooftop, alleviating the wiring problem of the uneven rooftop.

In the link of connecting the inverter output power to the hotel building's power grid, we matched H07RN-F 5x6 mm² (one of which is a ground wire) Low-voltage AC Cables. Its core function is to safely and stably connect the low-voltage alternating current converted by the inverter to the internal power grid of the building, providing power support for the hotel's daily operation. This cable is a low-voltage flexible rubber sheathed type, specially adapted to the commercial rooftop photovoltaic installation scenario. Compared with ordinary AC cables, its flexible rubber sheath has extremely strong weather resistance and outdoor resistance, which can adapt to complex outdoor environments such as high and low temperatures and humidity. It also has good mechanical damage resistance, suitable for bending and dragging during rooftop wiring, which can effectively avoid cable damage during construction and reduce later maintenance costs. The cable conductor is made of multi-strand copper wire, with stable electrical conductivity and reasonable core arrangement. The setting of the ground wire can effectively prevent leakage hazards during the operation of the photovoltaic system, complying with EU low-voltage electrical safety standards and adapting to the usage scenario of the hotel with dense personnel; the large current-carrying capacity can meet the power output needs of the hotel's photovoltaic system, and it can be directly adapted to the local power grid system in Croatia without additional modification, reducing construction procedures. At the same time, the product has passed IEC national standard certification, further ensuring compliance and quality stability, and helping the project pass local acceptance smoothly.

To meet the signal transmission needs between the inverter monitoring, sensors and control system in the photovoltaic system, we supporting suppliedRVV 3×1.5 mm² Control Cables. Its core function is to realize smooth signal transmission between various equipment, ensuring the real-time monitoring and normal operation of the photovoltaic system. Combined with the pain points of scattered arrangement of inverters and combiner boxes on the hotel rooftop and limited wiring space, the core advantage of this control cable is its extremely strong flexibility and convenient wiring. Compared with ordinary control cables, it is made of stranded multi-strand copper wire, which can be bent freely, and can be flexibly routed between scattered equipment without large-scale modification of the rooftop structure, greatly reducing the labor and time costs required for wiring. In addition, the cable insulation layer is made of flame-retardant material, with excellent insulation performance, which can effectively prevent signal interference, avoid the impact on the operation of the photovoltaic system due to signal interruption, and ensure that the hotel's photovoltaic system can real-time monitor the operation status and timely troubleshoot faults; the product has passed IEC national standard certification, with guaranteed quality, and the gray cable is easy to distinguish from other cables, improving construction efficiency and later maintenance convenience, perfectly adapting to the needs of long-term stable operation of the hotel's photovoltaic system.

III. One-stop Solution to Promote Project Implementation

In response to the five core pain points faced by the customer, we provided a full-process solution combined with our own experience and product advantages, followed up the project advancement throughout the whole process, ensured that each link can be efficiently implemented, and solved the customer's worries.

1. Policy and Approval Pain Points: Professional Consultation + Full-process Assistance

Considering the gradual opening of Croatia's photovoltaic policies and the unstable approval process, we set up a professional policy consulting team to provide the customer with comprehensive policy consulting and approval assistance services. The team is familiar with Croatia's "National Energy and Climate Plan 2021-2030", local photovoltaic subsidy policies and net metering registration processes, assisted the customer in sorting out subsidy application materials, guided the customer to complete the local approval process, followed up the approval progress throughout the whole process, and timely responded to various problems arising during the approval process. The original expected approval cycle of 3-4 months was shortened to 2 months, ensuring that the project successfully obtained government support and accelerating the project implementation speed. At the same time, our product certifications are complete, which can directly meet the compliance requirements of local approval, avoiding approval obstacles due to lack of certifications.

2. Rooftop Space Pain Points: Flexible Layout + Short-distance Wiring

In response to the limited space and complex layout of the hotel rooftop, we collaborated with the photovoltaic system design team to design a flexible module layout and customized bracket scheme for the customer, and combined with our short DC wiring design to maximize the use of rooftop space. The 4 mm² DC H1Z2Z2-K cables we selected can achieve short-distance and efficient transmission, reducing the space occupied by cables. At the same time, combined with the flexible wiring scheme, we avoided rooftop obstacles, and under the premise of not affecting the rooftop load-bearing capacity (strictly following the load requirement of 50-70kg/square meter for commercial rooftops), we realized the reasonable layout of photovoltaic modules, ensuring that the system power generation reaches the optimal level and meets the hotel's daily electricity needs.

3. Cable Weather Resistance Pain Points: Certified Products + Quality Assurance

The customer was worried about cable aging caused by the coastal outdoor environment. We specially selected TUV and UL4703 certified photovoltaic-specific DC cables, as well as H07RN-F flexible rubber sheathed AC cables, to fundamentally solve the weather resistance problem. These cables have all passed strict outdoor environment tests, and can long-term resist the erosion of strong ultraviolet rays, high temperature, wind, rain, salt spray and other factors, avoiding system failures caused by the aging of ordinary cables, extending the service life of the photovoltaic system, and reducing later maintenance costs. At the same time, we provided a product quality commitment letter to ensure that the service life of the cables is synchronized with the photovoltaic system, so that the customer has no worries.

4. Installation and Construction Pain Points: Flexible Cables + On-site Guidance

In response to the uneven rooftop, difficult wiring and the local construction team's unfamiliarity with specifications, we provided flexible cable wiring schemes and on-site construction guidance services. The selected RVV 3×1.5 mm² control cables and H07RN-F 5x6 mm² AC cables have good flexibility, easy to bend and drag, which can optimize the line direction and reduce wiring difficulty; at the same time, we sent professional technical personnel to Dubrovnik to guide the local construction team in cable installation and wiring, standardize the construction process, avoid cable damage, signal interference and other problems caused by improper installation, reduce construction time and labor costs, and ensure installation quality.

5. Power Grid Connection Pain Points: Advance Planning + Technical Support

To solve the complex distributed photovoltaic grid connection and many access restrictions, we assisted the customer in grid access design and load analysis in advance, and planned the inverter capacity and line scheme according to the hotel's electricity needs, ensuring that the current-carrying capacity and transmission efficiency of the cables match the grid access requirements. At the same time, we maintained communication with the local power grid company, assisted the customer in completing the grid connection application process, ensured that the power generation can be smoothly connected to the grid, and maximized the economic benefits of the project. Croatia's power grid is interconnected with other EU countries, and the good grid connection design also provides convenience for the customer's future power transactions.

IV. Safety Guarantee + Efficient Delivery

As a team with experience in undertaking similar projects, we always put quality and safety first, provided comprehensive safety guarantees for this project, and completed the delivery efficiently to ensure the project progresses on schedule.

In terms of safety guarantee, all supplied wire products have passed strict quality inspections. The DC photovoltaic cables have TUV certificates (certificate number B 126326 0001 Rev.00), and the AC cables and control cables have IEC national standard certifications. Each batch of products is provided with a test report to ensure that the products meet EU standards and project requirements. At the same time, our cables have flame-retardant, anti-leakage, anti-aging and other safety characteristics, which can effectively avoid electrical safety hazards during the operation of the photovoltaic system, protect the safety of hotel personnel and property, and avoid risks such as rooftop water leakage and collapse caused by cable quality problems.

In terms of delivery execution, relying on a sound supply chain system, we achieved rapid production and delivery. After the customer confirmed the order, we only took 25 days to complete the production, inspection and packaging of all cables, which were successfully delivered to the Dubrovnik Port in Croatia by sea. We followed up the logistics progress throughout the whole process to ensure that the goods arrived on time without affecting the project construction progress. At the same time, we provided perfect after-sales service. After the project was completed, we arranged technical personnel to provide post-maintenance guidance, and timely answered various questions encountered by the customer in the use of cables, ensuring the long-term stable operation of the system.

V. Project Achievements and Customer Feedback

The Croatia Dubrovnik Hotel Rooftop PV Project was successfully completed and put into use in the second half of 2024. With the wire products and one-stop solutions provided by us, the project achieved remarkable results: the photovoltaic system operated stably, the power generation reached the expected target, which can meet more than 35% of the hotel's daily electricity needs, saving a lot of electricity costs for the hotel every year; the cable products are suitable for the coastal outdoor environment, and there has been no aging or failure since operation, ensuring the long-term stable power generation of the system; the project successfully passed the local government approval and obtained renewable energy subsidies, further improving the economic benefits of the project.

This cooperation not only solved the multiple difficulties in the project implementation for the customer, realized green energy transformation and cost saving, but also highlighted our core advantages: first, complete certifications, the TUV and UL4703 certifications of DC photovoltaic cables and the IEC certifications of other products can be directly adapted to the EU and Croatian markets, solving the customer's compliance pain points; second, strong product customization capabilities, which can provide suitable cable specifications and schemes according to project scenarios and needs; third, perfect one-stop services, following up the whole process from policy consultation, product design, construction guidance to after-sales service, saving the customer time and effort; fourth, strong performance capacity, fast delivery and guaranteed quality, relying on experience in similar projects, we can quickly respond to various problems in the project.

The customer highly recognized the results of this cooperation, believing that our products are reliable in quality and our solutions are professional, which not only solved their core pain points, but also improved the efficiency and safety of the project, laying a foundation for future photovoltaic project cooperation.

VI. Outlook of Croatian Photovoltaic Market and Cooperation Invitation

At present, the Croatian photovoltaic market is in a stage of rapid development, with continuous favorable government policies and increasing demand for commercial rooftop photovoltaic projects. As an EU member state, its electricity can be conveniently transmitted to other EU countries, with great market potential. As a professional wire export team, we have rich experience in photovoltaic wire export, complete product certifications and perfect one-stop solutions. We can provide high-quality DC photovoltaic cables, AC cables, control cables and related services for photovoltaic projects in Croatia, helping customers seize market opportunities and achieve green development.

If you are promoting photovoltaic projects in Croatia (whether commercial rooftop photovoltaic, industrial photovoltaic or small-scale ground power stations) and facing various difficulties such as policy approval, cable selection, installation and construction, and grid connection, please feel free to contact us. We will provide you with customized wire solutions, relying on authoritative certifications such as TUV, UL4703 and IEC, high-quality products, fast delivery, and professional full-process services to help your project implement smoothly and achieve a win-win situation of economic and environmental benefits.

Contact Information

Tel/WhatsApp/WeChat: +86 135 1078 4550 / +86 136 6257 9592

Email: manager01@greaterwire.com