A Solar Fish Farm Setting a New Benchmark for Agrivoltaics in Shantou

In Shantou, located on the southern coast of China, a groundbreaking PV + fishery + storage project is setting a new standard for sustainable energy solutions. The 41.536MW/41.536MWh C&I system, implemented by Hoymiles in collaboration with Hengyun Group, combines solar power, energy storage, and sustainable aquacultural activities, marking a significant step in the integration of renewable energy with ecological preservation in the Guangdong-Hong Kong-Macao Greater Bay Area.

Solar fish farm is not new. It is a type of agrivoltaics application that employs floating solar arrays on the surface of a fish farm. Reducing water evaporation, keeping the water temperature low while generating clean energy, solar fish farm drives both economic and environmental benefits. 

But such large-scale projects are often plagued by problems like fluctuating power production, unstable returns, and difficulties in responding flexibly to grid. The high humidity and high temperature in the coastal area also poses challenges to the safe and stable performance of the system.

This is where Hoymiles’ innovative solar + storage solution came in at this fish farm in Shantou. By integrating the advanced HPCS energy storage inverters and HIM-MV stations, Hoymiles and Hengyun Group perfectly combined fishery, solar power production and energy storage to increase efficiency, stabilize output, and enable intelligent grid management.

The 41.536MW/41.536MWh "fishery-solar-storage" project adopted Hoymiles’ HPCS energy storage inverters and HIM-MV stations.

•  HPCS is Hoymiles’ centralized power conversion system that uses intelligent liquid cooling technology and ranks top in power density with floor space <1m2.

• HIM series is the PCS-MV station that integrates PCS, transformers, BCP, BSP, FFS and SS System.

Intelligent liquid cooling for efficient performance even in high temperature

Given the high frequency of charging and discharging cycles required for this project, the thermal management of the PCS was a crucial challenge. Hoymiles HPCS units are equipped with a smart liquid cooling architecture, which allows for optimal thermal management even in extreme environmental conditions.

The system is able to operate at full capacity at up to 50°C and can function stably even under extreme conditions of 60°C. The liquid cooling system ensures that the temperature difference of the IGBT power module is within 2°C, so that the system is efficient, safe and stable in high power and frequency operation.

The liquid cooling technology extends the overall lifespan of the equipment, promising the long-term value of the investment.

High protection rating for excellent environmental adaptability

The subtropical climate there is characterized by high humidity levels and salt fog. Hoymiles’ products are built with the rigorous IP65 and C5 protection rating, providing high levels of resistance to dust, moisture, and corrosion.

Furthermore, Hoymiles’ system is capable of supporting up to 1.1 times the rated load in altitudes of up to 2,000 meters. Whether located in coastal regions with high salinity or in desert areas with temperature fluctuations, Hoymiles solutions deliver consistent, high-efficiency performance.

Precision control for grid operation

The project successfully completed a 168-hour continuous trial run in June 2025. The measured charging and discharging efficiency of the storage system exceeded 90%. The system performed successfully in multiple testing scenarios, including Automatic Generation Control (AGC) frequency regulation and electricity spot market simulations, which validated the system's ability to participate in grid operations.

This is due to the less-than-20ms charging and discharging switch, which makes sure the power station can regulate power in response to the grid command.

Energy hub for the community

The 99% maximum efficiency of the HPCS means it can powerfully support the grid operation and take part in peak shaving, frequency regulation and energy compensation.

With the contribution of storage, the power plant becomes a smart energy hub in the community. Beyond providing clean energy for the fish farm, the project is also transmitting surplus energy to households and factories nearby through flexible dispatching, promoting efficient transformation and utilization of renewable energy. This integrating power generation, storage, and consumption into a cohesive, efficient system that delivers both ecological and economic benefits.

A model of ecological preservation and economic success

The success of this project highlights the versatility of Hoymiles’ technology in enabling large-scale integration of renewable energy storage. It not only provides a blueprint for future coastal and offshore renewable energy projects, but also serves as a model for combining ecological preservation, economic success and smart energy management.