Insights · 23 June 2026 · 5 min read

Wind-Stow Safety for Solar Trackers

A tracker spends its life presenting a large, angled surface to the sky. That is exactly what you want for energy — and exactly what you do not want in a storm. Wind-stow is how a tracker reconciles the two.

Why a moving array needs a stow mode

Wind load on a solar array scales with the area exposed to the flow and the angle it presents. A tilted module acts like a sail; gusts can generate large lift and overturning forces, and dynamic effects such as flutter can be more damaging than steady pressure. A fixed array is engineered once for a worst-case angle it can never leave. A tracker has a powerful advantage: it can move to a safer angle on demand.

What "stow" actually means

Stowing means driving the panel to a defined safe position when wind crosses a threshold, then holding it there until conditions clear. The right stow angle depends on the structure, but the principle is to minimise exposed area and the forces the structure has to resist. Good wind-stow behaviour has a few non-negotiable properties:

• A clear trigger. Stow initiates on a measured wind condition (and can also respond to a site-level signal), with hysteresis so the tracker doesn’t oscillate in and out of stow near the threshold.
• Reliable actuation. The drive must be able to reach the stow position under load, not just in calm conditions.
• Predictable recovery. When wind subsides, the tracker returns to normal tracking in a controlled way — no sudden slews.
• Fail-safe bias. On a fault or loss of signal, the safe default is to protect the asset, not to keep chasing the sun.

Wind-stow is a controller problem as much as a mechanical one. We develop the firmware and the commissioning checks together so the stow path is validated on site, not just on paper.

What to specify for your site

When you brief us (or any tracker supplier), the wind-relevant inputs that matter are:

• Wind zone / basic wind speed for the location, per the applicable code.
• Terrain and exposure — open ground, rooftop, or sheltered.
• Any site-specific events such as known gust patterns or seasonal storms.
• Operational preferences — how conservative the stow trigger should be, balancing safety against lost generation during marginal wind.

Get these right and wind-stow becomes invisible: the tracker simply protects itself when it needs to and goes back to earning yield when the weather passes.