New floating PV system for near-shore applications – pv magazine International

Norwegian startup Sunlit Sea has designed a floating array consisting of a single integrated cold-pressed aluminum float with a near-standard solar panel bonded to the top surface. A mono PERC photovoltaic panel with an efficiency of 22.7% is glued to the top of the float, giving a total unit thickness of 85 mm.

Norwegian startup Sunlit Sea has developed a new floating photovoltaic system consisting of an integrated cold-pressed aluminum single-unit float and a near-standard solar panel bonded to the top surface.

“To achieve the required energy yield, a matrix is ​​made up of several individual units,” said the company’s marketing manager, Christoffer Isdahl. photo magazine. “Usually these individual units are first gathered into a chain and then all the chains are tied together.”

The floats are attached with polyurethane hinges and each float measures 1880mm x 1880mm x 85mm. Its weight is 60 kg, and a rope consisting of 14 floats reaches 840 kg. “The aluminum float itself is two 1.5mm pressed blanks with dimples,” Isdahl explained. “The two blanks are symmetrical, positioned face to face, and riveted to form the float.”

A special photovoltaic panel is glued to the top of the float, giving a total unit thickness of 85mm. “The photovoltaic panel is made of 3.2mm thick solar glass and a laminate enclosing the photovoltaic cells, circuitry and plastic shielding,” Isdahl said. “The laminate is 1.5mm thick and is bonded to the glass by the photovoltaic panel manufacturer. The total thickness is then 4.7 mm.

The solar panel has an output power of 537W and is based on 100 monocrystalline PERC cells measuring 158.75mm x 158.75mm. It features a power conversion efficiency of 22.7%, an open circuit voltage of 68.7 V and a short circuit current of 9.57 A. It is also equipped with small pockets that use water from sea ​​for theliquid cooling.

To connect the floats in a large array, a system consisting of two aluminum brackets and multiple hinges is mounted on either side of the panel, with one hinge shared between two panels. “Brackets are a key part of the mechanical attachment of the system,” Isdahl said. “On the one hand they are bolted to the aluminum float with a set of aluminum blind rivet nuts, where each rivet nut provides a tensile load resistance of 17.5 kilonewtons and on the other they include the polyurethane hinges in the parallelepiped socket that they are shaped.

The individual solar floats making up the chains are delivered electrically and mechanically connected. “Additional electrical work is not part of Sunlit Sea’s delivery,” Isdahl explained.

The Norwegian certification body DNV recently approved the system design. Sunlit Sea works closely with the University of Oslo, the Norwegian test facility Stadt Towing Tank and the Institute for Energy Technology, which started life as a Norwegian nuclear research entity.

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