Agrivoltaics Mounting Structures: Design Guide for Dual-Use Solar and Agriculture

Key Takeaways

• Agrivoltaics co-locates solar PV and agriculture on the same land, achieving Land Use Efficiency (LUE) of 160-190% — the same land produces more combined value than two separate single-use plots.
• Mounting structures for agrivoltaics require 2.5-5 meters of clearance for farm machinery, row spacing matched to tractor implement widths (typically 6m or 12m), and corrosion-resistant aluminum or galvanized steel for exposure to soil, fertilizer, and irrigation.
• Water savings of 14-50%, panel temperature reductions of up to 10°C, and increased yields for shade-tolerant crops make agrivoltaics financially compelling despite a 52% higher CAPEX than standard ground-mount solar.
• Solaracks manufactures elevated ground-mount structures suitable for agrivoltaic applications, with adjustable height configurations, CE certification, and engineering support for EPC contractors and agricultural solar developers.

Table of Contents

• What Is Agrivoltaics?
• Why the Mounting Structure Is the Critical Variable
• Clearance and Height Requirements
• Row Spacing Design
• Fixed-Tilt vs. Tracking Systems
• Mounting Materials for Agricultural Environments
• Best Crops for Agrivoltaic Systems
• Agrivoltaics and Livestock
• The Financial Case: CAPEX, OPEX, and LUE
• Global Regulatory Frameworks
• How to Specify an Agrivoltaic Mounting Structure

What Is Agrivoltaics?

Agrivoltaics — also called agrophotovoltaics or agri-PV — is the practice of co-locating solar PV panels and agricultural production on the same land area. Crops, livestock, or pollinator habitats operate underneath or between solar panel rows while the panels generate electricity above.

The relationship creates measurable synergies in both directions. PV panels provide shade that reduces heat stress on crops, cuts soil moisture evaporation by 14-50%, and physically protects plants from hail and heavy rainfall. Simultaneously, the evapotranspiration from crops and soil cools the panels by up to 10°C compared to standard solar farms — improving module efficiency and extending panel lifespan. Source: PVcase

The result is a Land Use Efficiency (LUE) of 160-190%. An agrivoltaic system achieves more combined agricultural and energy output per hectare than the same land area divided between a conventional solar farm and a conventional crop farm side by side.

Why the Mounting Structure Is the Critical Variable

In a standard ground-mount solar installation, mounting height is set for structural efficiency — typically 0.5-1.0 meters clearance. Standard rows are spaced at 1.5-3 meters.

Neither figure works for agrivoltaics.

Farm machinery — tractors, harvesters, spray rigs — requires vertical clearance of 2.5-5 meters and row widths matching standard implement sizes. The mounting structure must provide this clearance while remaining structurally sound under wind, snow, and seismic loads appropriate to the site.

Getting the structure wrong means one of two outcomes: either the agricultural activity is impractical (structure too low, rows too narrow), or the solar yield is compromised (structure over-engineered at excessive cost). The mounting system is the engineering constraint that determines whether the project is viable.

Clearance and Height Requirements

Vertical Clearance for Farm Machinery

The required clearance height depends on the agricultural activity:

For most commercial agrivoltaic projects combining row crops and mechanized farming, a clear height of 3.0-4.5 meters covers the majority of operations. Projects targeting shade-tolerant low-profile crops (lettuce, herbs, strawberries) can use lower clearance heights and reduce structure cost.

Panel Mounting Height vs. Post Height

The panel mounting height is the clearance under the lowest edge of the tilted panel frame — not the top of the post. On a south-facing array at 20° tilt, the lower edge of the module sits considerably lower than the post apex. Confirm clearance is measured at the module underside, not at the post.

Row Spacing Design

Row spacing in agrivoltaics serves two purposes that pull in opposite directions: maximizing solar density (narrow rows) versus enabling full agricultural productivity (wide rows).

Machinery Width Requirements

Standard agricultural implement widths:

Row spacing of 6 meters allows most standard tractor and spray operations. 12-meter spacing accommodates full combine harvester operation and is required for large-scale mechanized grain farming. A March 2026 study by US researchers published in PV Magazine confirmed that wider row spacing makes large-scale mechanized agrivoltaics economically viable by maintaining crop production levels while improving combined agricultural and energy revenues. Source: PV Magazine

Solar Yield Implications

Wider row spacing reduces Ground Coverage Ratio (GCR) and therefore reduces solar output per hectare compared to a standard utility ground-mount. This trade-off is fundamental to agrivoltaic project economics — the combined LUE justifies the lower solar density when agricultural productivity is maintained.

Fixed-Tilt vs. Tracking Systems

Fixed-Tilt Agrivoltaic Structures

Fixed-tilt systems set the panel array at a defined angle — typically 20-30° in mid-latitudes — and hold that angle for the system's full design life. They are structurally simpler, have lower CAPEX, and require no moving components for maintenance.

The trade-off is reduced light homogeneity beneath the array. Fixed-tilt panels create alternating strips of shade and direct sun, which suits some crops (row crops where each row falls in a consistent light zone) but creates challenges for others.

Tracking Systems for Agrivoltaics

Agricultural PV trackers offer two capabilities standard fixed-tilt systems cannot match:

"Tilt for crop" mode: The tracker adjusts panel angle to increase light penetration to crops during critical growth stages — flowering, fruit set, high-demand periods — by flattening the array and allowing more diffuse light through.

"Defense mode": In heavy hail or high-wind events, the tracker rotates panels to a stow position (near-vertical), both protecting the modules and allowing maximum rainfall to reach crops rather than being shed at the panel edge as concentrated drip lines.

Trackers add 15-25% to CAPEX compared to fixed-tilt agrivoltaic structures but can significantly improve both solar yield and crop productivity. For shade-sensitive crops where the fixed-tilt shade pattern would reduce yields, a tracker may be essential to project viability. Source: PVcase

Mounting Materials for Agricultural Environments

Agricultural sites expose mounting structures to conditions that standard solar racking is not always designed for:

• Soil moisture and irrigation: Continuous ground moisture accelerates corrosion at the foundation and post base.
• Fertilizer and agrochemicals: Spray applications coat structure surfaces with corrosive chemicals.
• Livestock contact: Grazing animals rub, scratch, and lean against structural members.
• Pest control applications: Fumigation and pesticide spray environments require corrosion-resistant coatings.

Recommended Materials

Avoid standard zinc-passivated (white rust) coatings on primary structural members in agrivoltaic environments. Fertilizer residue and irrigation runoff rapidly deplete thin zinc coatings at ground level. Hot-dip galvanizing to ISO 1461 (minimum 85 µm) or ZAM (Zn-Al-Mg) coating is the appropriate baseline. Solaracks manufactures both aluminum and hot-dip galvanized structures rated for outdoor agricultural exposure.

Foundation Options

Screw pile foundations are the preferred choice for most agrivoltaic projects. They are installed with low-impact equipment, avoid soil compaction compared to driven piles, and can be removed at end of system life without leaving a concrete slab. Soil condition assessment is required before specifying pile depth and diameter.

Best Crops for Agrivoltaic Systems

Crop selection is governed by the Light Saturation Point (LSP) — the light intensity above which additional sunlight no longer increases photosynthesis. Crops with a low LSP are shade-tolerant and thrive under solar panels; those with a high LSP require more light.

Shade-tolerant crops show yield increases under agrivoltaic shading — typically because reduced heat stress prevents leaf scorching and extends the growing season. Lettuce and kale under 50% shading have shown higher water use efficiency and biomass accumulation compared to open-field control groups. Source: PVcase

Agrivoltaics and Livestock

Solar grazing — pasturing livestock beneath solar panels — reduces vegetation management costs and can eliminate mowing entirely on grass-covered sites.

Sheep work well. They graze short grass, do not damage panel frames, and tolerate the shading conditions created by the array. Sheep produce higher-quality wool under agrivoltaic systems in some hot-climate studies.

Goats must be avoided. They climb — including onto panel frames and lower structural members — and will damage modules, cables, and junction boxes. Any site specifying goat integration requires full structural shielding up to the lowest panel frame.

All livestock sites require cable and junction box armoring. Wiring runs at animal contact height must be in conduit, and any exposed low-voltage components must be shielded against contact damage.

The Financial Case: CAPEX, OPEX, and LUE

Agrivoltaic structures carry higher CAPEX than standard ground-mount systems. In the US, CAPEX for reinforced agrivoltaic structures reaches approximately $2.33/W — roughly 52% higher than conventional ground-mount PV. Source: PVcase

However, the operating economics work in agrivoltaics' favor:

• LCOE on agrivoltaic grassland projects: ~0.08 €/kWh — lower than domestic rooftop solar
• LCOE on arable land: ~0.12 €/kWh — still competitive versus grid power in most European markets
• Land value: The agricultural productivity of the land continues, offsetting the cost of the structure premium versus dedicating the land to solar alone
• Water savings: 14-50% reduction in irrigation demand reduces farm operating cost

Revenue streams from a mature agrivoltaic project include energy sales, crop or livestock revenue, and in many markets, LEC (Local Energy Community) or REC (Renewable Energy Certificate) income.

Global Regulatory Frameworks

Agrivoltaics regulation is formalizing globally:

In most jurisdictions, the land must maintain an active agricultural classification to access rural subsidy programs. This typically requires demonstrating continued crop production — the agrivoltaic structure must support, not displace, the agricultural activity.

How to Specify an Agrivoltaic Mounting Structure

For EPC contractors and project developers specifying agrivoltaic structures, the key parameters to define before soliciting quotes:

1. Clear height: Determine the tallest machinery that will operate under the array. Add 0.5 m safety margin.
2. Row spacing: Confirm with the farming operator the widest implement in use. Size rows to the widest implement.
3. Foundation type: Soil assessment determines pile type. Screw piles for most agricultural soils; driven piles where soil conditions require.
4. Panel tilt and orientation: South-facing (northern hemisphere) at 20-30° for maximum yield; or east-west vertical for agrivoltaic applications where crop shading uniformity is critical (see our vertical solar fence guide).
5. Material specification: Hot-dip galvanized steel or ZAM for main structure; aluminum for rails and module clamps; SS304/316 fasteners throughout.
6. Load certification: CE (EU), AS/NZS 1170 (Australia/NZ), or IBC (US) structural certification matching the project's target market.

Solaracks manufactures elevated ground-mount structures suitable for agrivoltaic applications with adjustable height configurations, multiple foundation options, and full CE-certified engineering documentation. Contact the team for project-specific drawings, load calculations, and pricing.