Floating photovoltaic array of FPV systems on the sea: definition, applications, and implementation path
Driven by the dual goals of "dual carbon" and energy transformation, photovoltaic power generation has become the core direction of clean energy deployment. However, traditional ground-based photovoltaic power stations face bottlenecks such as tight land resources and prominent ecological occupation conflicts, while floating photovoltaic arrays on the water surface, as an emerging distributed photovoltaic application model, are gradually expanding to marine environments.
The floating photovoltaic array of floating PV systems on the sea refers to an engineering solution that uses floating structures to fix photovoltaic modules on the sea surface and achieves stable power generation through anchoring systems. Its business background stems from the high demand for electricity in coastal cities, abundant resources in idle waters near the coast, and the trend of comprehensive energy development where offshore wind power and photovoltaics complement each other. Industry pain points such as high salt spray corrosion, wave load impact, and biological adhesion have prompted the evolution of technology towards high reliability, wind and wave resistance, and corrosion resistance. This also provides practical significance for this article to explore its technical connotations and implementation strategies.
Core theme analysis: Technical composition and functional positioning of floating photovoltaic arrays of FPV Systems on the sea
The core of the floating photovoltaic array of FPV Systems on the sea lies in the migration of traditional photovoltaic systems from land to marine environments, which includes floating platforms, photovoltaic modules, anchoring systems, electrical transmission, and intelligent monitoring. Floating bodies are usually made of high-density polyethylene or glass fiber reinforced plastic, which have the characteristics of UV resistance, seawater corrosion resistance, and lightweight high buoyancy.
Components should be packaged in double glass or coated with anti-salt spray coating to cope with high humidity and salt spray erosion. The anchoring system uses suction anchors, gravity anchors, or pile anchors based on water depth and seabed geology to ensure the stability of the array's position under typhoon and tidal conditions. In addition to power generation, this array also has ecological synergy values such as shading, inhibiting algae reproduction, and providing a platform for fisheries and aquaculture. It is particularly suitable for wind solar complementary, seawater desalination, and island power supply scenarios. From an industry perspective, the technical difficulty lies in the assessment of floating body fatigue life and electrical insulation protection. The current mainstream solution has been verified through dynamic simulation to be able to withstand typhoons of level 12 and waves up to 3 meters high.
Requirement scenarios and application examples: Focusing on coastal industries and special water areas
The typical demand scenarios for floating photovoltaic arrays of FPV systems on the sea are concentrated in three types of areas: first, coastal industrial parks and ports, where power loads are dense and land costs are high. Constructing arrays using the inner waters of harbor pools or breakwaters can directly supply green electricity and reduce transmission losses.
The second is the offshore aquaculture and fishery complex area, where photovoltaic systems are integrated with deep-sea net cages to form a "fish light complementarity". Photovoltaic power generation provides energy for aerators and automatic feeding equipment, while shielding some parts of the sea surface to reduce water temperature fluctuations. Thirdly, in islands and remote coastal communities, traditional diesel power generation has high costs and pollution. Combining photovoltaic arrays with energy storage can form a microgrid to ensure basic electricity supply.
For example, a 20 MW offshore floating demonstration project in Bohai Sea adopts a modular floating array deployed in a semi-enclosed bay with a depth of 8 meters. After two years of operation, the data show that the annual power generation is about 5% higher than that on land, and the component cleaning frequency is reduced by 30%, verifying the positive effect of the offshore environment on power generation efficiency. This case demonstrates that floating arrays on the sea are feasible and economically viable in mid to low latitude regions with mild waves and strong ultraviolet radiation.
Service types and program characteristics: mainstream models and technological differentiation
The current service types of floating photovoltaic arrays of FPV systems on the sea are mainly divided into three modes: first, fixed floating arrays, suitable for stable waters near the sea with a depth of 5 to 20 meters, using chains and cement anchor blocks for fixation, with low cost but limited resistance to extreme weather conditions. Secondly, by dynamically tracking the floating array and using a single axis or dual axis tracking system to rotate the components according to the angle of the sun, the power generation efficiency can be improved by 10% to 20%.
However, the floating structure is subject to complex forces and is suitable for deep water areas or medium wave environments. Thirdly, the submersible array can be adjusted by ballast tanks to submerge and shelter from typhoons, and then float up to generate electricity after the storm. This technology is still in the experimental stage, but represents a high disaster resistance direction. The core of scheme differentiation lies in the floating material (such as the single floating box vs. the assembled floating pipe), anchoring redundancy, and anti-corrosion coating process. Objectively speaking, the dynamic tracking type is more suitable for areas with high annual irradiance and clear electricity price subsidies, while the fixed type is more suitable for projects that are sensitive to initial investment and have weak operation and maintenance capabilities.
Quality control and implementation standards: ensuring long-term reliable operation
The quality control of floating photovoltaic arrays of FPV systems on the sea covers the entire chain of design, manufacturing, construction, and acceptance. During the design phase, components must undergo salt spray, ammonia, and PID testing in accordance with IEC 61215 and IEC 61730 standards. The floating structure must be verified through finite element analysis to have a fatigue life of no less than 25 years. In the manufacturing process, the floating body welding process requires airtightness testing and color fastness evaluation, and electrical components should adopt IP68 waterproof rating.
The construction process includes underwater geological exploration, anchoring and embedding, and floating body assembly. The installation error should be controlled within ± 5 centimeters, and the cable joints should be sealed with water pressure resistance. During the acceptance stage, a 48 hour full load power generation trial run is required, and multidimensional data such as waves, wind speed, and component temperature must be collected to compare deviations with the design model.
The industry recommends using the "Code for Design and Construction of Offshore Photovoltaic Systems" or local enterprise joint standards as the basis, but it should be noted that some clauses are still within the scope of recommendations, and should be dynamically adjusted in accordance with the project's marine environment during actual implementation.
Service guarantee and long-term value: operation and maintenance system and sustainable cooperation
The long-term value of floating photovoltaic arrays of FPV systems on the sea depends on reliable after-sales support and iterative upgrading mechanisms. Service guarantees typically include a 10-year warranty for floating structures, a 25-year linear power warranty for photovoltaic modules, and a 72 hour response commitment for remote monitoring systems to fault alarms. At the operational level, it is necessary to arrange irregular inspections of anchor chain tension, cleaning of attached organisms, and detection of component hot spots on ships.
It is recommended to combine drone infrared inspections to improve efficiency. In terms of user rights, we can provide power generation commitments (such as attenuation rate not exceeding 1% per year) and insurance claims channels to reduce operational risks for homeowners. The value of sustainable cooperation lies in: on the one hand, with the improvement of material lightweighting and intelligent control technology, the energy efficiency optimization of the array can be achieved through the installation of marine meteorological sensors or adaptive anchoring systems in the future.
On the other hand, comprehensive energy experiments such as "photovoltaic+ hydrogen production" and "photovoltaic+ seawater desalination" will be carried out using offshore array platforms to build a multi-energy complementary closed-loop revenue system for owners.
Overall, the current offshore floating photovoltaic array has entered the early stage of large-scale application from the demonstration stage, and technological iteration and standard improvement will jointly promote it to become an important component of coastal clean energy supply.
