Causes and Consequences of “Swimming” Oscillation in Flexible Brackets: Cell Micro-Cracks and Structural Instability

This article carries out technical analysis on the basis of national policies, standards and codes, public data and the current state of the industry. It is intended purely as objective discussion, only to make the product structure sounder, and is not directed at anyone.

In the world of long-span PV flexible brackets there lurks a well-known "secret technique" — "swimming" oscillation.

Have you ever seen it on site? The bracket's graceful "dancing with the wind" is not normal "flexible buffering": the whole row of modules bobs up and down in the wind, flapping harder than frogs, just like a flock of panicking little froglets gasping and kicking in the waves. Quite a picture, isn't it? But don't just feel sorry for them — behind it hides the major hidden danger of a "soft, collapsed" structure.

I. Once you have read this you will wipe your brow: "swimming" oscillation is an irreversible, incurable disease of the plant

This kind of high-frequency, large-amplitude, irregular violent shaking damages the plant fundamentally, across the whole chain and beyond remedy — it simply sends the 25-year design life into "early retirement".

1. Modules are brittle as thin ice: one twist and they crack — "early retirement" on the spot

Crystalline silicon cells are essentially sheets of glass-like paper and cannot withstand repeated twisting and alternating stress. Once the bracket starts "swimming", the modules dance along with it, and the cells instantly suffer large-area micro-cracks, with grid lines snapped outright. A cliff-like drop in power generation is only the appetizer: as the cracks spread they cause hot spots and even self-ignition — at best the power is written off, at worst the whole module burns. Most hopeless of all: micro-cracks are a permanent disability, impossible to repair or rescue; the modules can only be quietly thrown away, with no way out at all.

2. Structural connections "fall apart", ending in "total collapse"

Under high-frequency vibration, clamps, fixtures and bolts race one another to loosen; wear and breakage follow in one breath. Aluminium frames crack from the shaking, modules detach and collide, triggering chain damage. The load-bearing strands suffer fatigue wire breaks, anchors loosen, prestress fails completely — and there is only one ending: the entire bracket system collapses, the plant is paralysed outright and turns into a pile of scrap.

3. The electrical system "goes haywire", and O&M becomes a bottomless pit

Junction boxes with cold solder joints, cables torn, insulation cracked — short circuits, leakage and unexplained shutdowns become daily routine. Later O&M costs rise exponentially, with fire and electric shock risks hanging overhead. A perfectly good "power-generation money printer" is shaken into a "money shredder": not only does it stop making money, it loses everything, leaving no place to cry.

The most painful conclusion: once the "swimming" starts, the plant is at the terminal stage — no one can save it. A plant designed for 25 years is often completely written off in 3–5 years, and a huge investment goes to zero overnight. Many owners were dazzled by the fancy packaging at the beginning and did not care whether the structure was sound; once the wind blows and the swimming starts, whatever is said is too late — a large sum is lost for nothing, and regret is useless.

II. The truth of the trade: the capable rely on products; the incapable rely on "swimming" to grab attention

Everyone in the trade understands one principle: companies with real strength are remembered by the industry and trusted by owners through quality products and solid technology. Yet some companies get trending attention precisely through "swimming" — famous, yes, but this path is truly not recommended; watching them makes one anxious on their behalf.

To speak frankly: it is simply unrealistic to expect owners to become expert in flexible brackets. The professional threshold of flexible brackets is extremely high — even industry professionals and senior R&D people may not fully master them, let alone ordinary owners. Expecting owners to go from "novice" to "expert" and judge the structural soundness of every cable and every bolt is demanding the impossible.

So the root of the problem often lies not in owners "not understanding", but in manufacturers "pretending despite insufficient capability".

Everyone wants to make good products, everyone wants the company to grow strong, everyone wants the glory. Ambition can be big, but capability is only so much. Being unable to control deflection, withstand wind vibration, or build a sound system is not an attitude problem — the structural foundation genuinely falls short.

Limited capability is understandable and even deserves sympathy; but when the skill is not there and one props up the scene with a pile of expert titles, academic certificates and honour medals, it becomes both ridiculous and pathetic. With something as hard as structure, you really cannot cover it up or fool anyone.

III. The iron rule of the industry: structure is the sole lifeline of every product

Whether it is PV brackets, cars, or high-speed trains and aircraft, the lifeline of all industrial products comes down to one word: structure.

Structure is the skeleton. Without a skeleton, however fair the skin and however expensive the clothes, it is a paper tiger — fine to look at, useless in use. Structure is the soul. Without a soul, however beautiful the parameters, it is a castle in the air.

When the structure is sound, everything is sound; when the structure is hollow, everything is hollow.

Deflection control is the basic skill of a structure;

Wind vibration resistance is its survival line;

Balanced load bearing is its lifeline;

Long-term stability is its final examination.

What decides whether a PV bracket can serve 25 years has never been the number of certificates, the loudness of titles or the flashiness of the packaging, but whether the structural logic is rigorous, the mechanical design is reasonable, the restraint system is reliable and the overall stiffness is up to standard.

Talking about flexibility without structure is building castles in the air; talking about stability without structure is armchair strategy; talking about safety without structure is self-deception.

IV. A few heartfelt "plain words" for the industry

1. To companies:

Structure is the root; stop playing with the superficial. If you can do it well, settle down and do it; if you cannot, do not pretend. Covering structural shortcomings with packaging is the saddest thing in the industry — and the funniest.

2. To owners:

Although you cannot possibly master flexible brackets, you can grasp the most core, at-a-glance check: look at the structure and the deflection, and never wait for a strong wind to see whether it is stable. Do not be dazzled by the fancy stuff. Once the swimming starts, regret comes too late — that is when you can lose everything!

3. To the industry:

Standards need completing and the threshold needs raising. Do not let products that survive on packaging and "swimming" ruin plant after plant and hurt sincere people one after another.

V. Conclusion

Everyone wants success and dignity. It is normal for capability to have limits; using packaging to cover structural shortcomings is what is most laughable, and most regrettable.

The future of the industry always belongs to companies that build structures in a down-to-earth way and make products with real materials. May every plant be structurally sound and safe; may every owner have a discerning eye and invest with peace of mind, so that plants run steadily for 25 years, earn returns steadily, and never take early retirement!

We are willing to work with owners and design institutes on prudent selection, safeguarding the peace of mind and returns of projects.