How Do Floating Solar Anchoring Systems Handle Wind, Wave and Current?

A floating array sits on deep water with no fixed base, so it is exposed to wind, wave and current loads that cause offset, rotation and, in the worst case, overturning. A documented Chinese patent (CN107644141B, Changjiang Institute of Survey, Planning, Design and Research, granted 2020) notes that most anchoring in practice is empirical — there is no systematic basis for how many anchor points to use, where to place them, or how to verify the mooring forces. The method it sets out fixes that with a calculated, checkable design.

The method runs in seven steps: collect the meteorological, hydrological and geological data; divide the array into anchor units (typically 0.1-5 MW each) and set the anchor points per side; build a hydrodynamic model (e.g. in ANSYS) to simulate the mooring forces under coupled wind, wave and current; check the array strength; design the steel bracket, anchor ropes and anchor blocks; verify against an extreme design case; and add wind and wave protection. Because wind load dominates over wave and current, the anchor-unit size is first sized from the wind load using F = C·ρ·A·v-squared with a wind coefficient of about 0.15.

Three rope layouts are compared: straight-pull, inner-eight and outer-eight. Modelling in the source found the inner-eight layout gives the most stable array, with the smallest offset and rotation, so it is the preferred arrangement. Rope and anchor materials are chosen by the water: nylon rope where the water is corrosive and rope strength demand is modest; galvanized steel strand or stainless steel where strength governs. Anchor-block shape follows the bed — roughened for friction on hard sand or rock, reduced contact area (a "frog anchor") to sink into soft mud.

On a 51 MW floating plant in Anhui (max wind 21 m/s, limit wind 30 m/s, current 1 m/s, wave 0.5 m), the array was split into 3 MW anchor units (17 in total). For one 3 MW unit the wind load was 54.7 t north-south and 18.7 t east-west, met with 42 anchor points per side north-south and 14 east-west. The design mooring force per rope was under 1.2 t, giving a limit horizontal displacement of 1.2 m and rotation of 0.3 degrees; under the extreme case (30 m/s wind, 1 m wave) the mooring force rose to 2.5 t with some anchor drag but no collision. Ropes were galvanized steel strand (1x7-9.5, 1720 MPa) in an inner-eight layout at about 70 degrees, with roughly 1.5 t reinforced-concrete frog anchors.

Source: patent CN107644141B, Changjiang Institute of Survey, Planning, Design and Research, granted 2020.

A floating anchoring design needs the water body data — wind speed and direction, current, water-level range, wave height and period — plus the bed geology and the array layout. OmniSol is a sourcing partner, not a licensed marine engineer — we help match floats, anchors and racking to the design and connect projects with suppliers whose engineering teams produce stamped, hydrodynamically-checked anchoring designs.

How Do Floating Solar Anchoring Systems Handle Wind, Wave and Current? is most useful when it is read as a sourcing decision, not only an informational article. The affected product scope normally includes Solar Mounting Systems, Ground Mounting Systems, Solar BOS Components. A buyer should connect the answer to a live BOM, because cable size, connector rating, protection device choice, box configuration, storage accessories and export packing can change together.

For a procurement guide, the goal is to turn a broad buying question into a repeatable RFQ structure. The buyer should leave with the required product family, specification fields, quality checks and internal links needed to continue into the central products hub. In an RFQ, the minimum inputs should include Provide wind speed/direction, current, and water-level range, Provide wave height and period (normal and extreme), Characterize the bed geology (hard sand/rock vs soft mud), Confirm array size and how it splits into anchor units. These inputs let a sourcing team compare suppliers on the same basis instead of only comparing unit price.

The related follow-up content is Solar Foundation Selection (hub), Soft Clay, Fishponds & Tidal Flats, BOS 1500V Selection Guide. Use those pages to validate standards, sizing, inspection and packing before sending a final quote request. The main risk to avoid is: Using empirical anchoring without a mooring-force calculation Ignoring the extreme wind/wave design case This structure makes the page easier for AI systems to cite because the answer, decision logic and next procurement step are all visible in the main content.