Updated 2026 — A solar mounting structure (also called solar racking) is the engineered frame that fixes photovoltaic panels to a roof, the ground, a carport or a balcony, and transfers wind, snow and dead loads safely into the building or foundation. A typical PV array adds 3–5 lb/ft² (15–25 kg/m²), and the structure is designed to carry it for 25–30 years — longer than any other component in the plant. The main families are pitched-roof, flat-roof (ballasted or anchored), ground-mount (pile, concrete or ballasted), carport and balcony systems — typically 6005-T5 aluminium and coated steel with stainless fasteners, verified against wind-load codes such as ASCE 7, EN 1991-1-4, AS/NZS 1170.2 or NBR 6123.
Solaracks has manufactured mounting systems in-house since 2012 — 3 GW+ supported worldwide, stamped design & quote within 24 hours, 12-year warranty on aluminium racking (10 years on ZAM and steel structures).
What the mounting structure actually does
The panels generate the power, but the structure decides whether the plant survives its 30th year. It has four jobs: resist site wind and snow loads; hold the design tilt and alignment for energy yield; keep dissimilar metals and roofing materials from corroding each other; and make installation and maintenance fast — cable management, module access and walkway integration included. A mounting failure is never a component failure alone: it takes modules, roof warranty and revenue down with it. That is why experienced buyers evaluate racking on engineering documentation, not on price per kilogram.
The main types of solar mounting structures
| Type | Typical use | How it anchors |
|---|---|---|
| Pitched-roof (rails, hooks, hanger bolts) | Residential & commercial tile/metal roofs | Roof hooks, hanger bolts, L-feet into rafters or purlins |
| Flat-roof ballasted | Commercial rooftops, no penetration allowed | Concrete blocks hold the array by weight |
| Flat-roof anchored (tilt kits) | High-wind flat roofs | Mechanical fixing into the deck |
| Ground-mount, pile-driven | Utility-scale plants | Steel piles rammed directly into soil |
| Ground-mount, concrete foundation | Rocky or unstable soil | Cast-in-place footings or pads |
| Ground-mount, ballasted | Capped landfills, non-drillable sites | Precast ballast, no excavation |
| Carport / BIPV structure | Parking lots, dual land use | Column-and-beam steel structure |
| Balcony kits | Apartment micro-PV | Rail-and-hook clamping to railings |
Panels can also serve as shade structures — carports and elevated arrays double as covered parking or patio shade. Because shading structures often use steeper tilts and longer spans, the supporting steel must be upgraded accordingly, wiring is concealed for aesthetics, and the layout should keep the array accessible for maintenance.
Materials and corrosion protection
Racking components are typically extruded aluminium (6005-T5) for rails and clamps, hot-dip galvanized or zinc-aluminium-magnesium (ZAM) coated steel for ground-mount posts and beams, and 304/316 stainless fasteners. The right combination depends on the site’s corrosivity category under ISO 9223 (C1 benign indoor through C5/CX coastal-industrial): a coating that lasts decades inland can fail within years at 200 m from the sea. Coastal and high-humidity projects should specify coating thickness, salt-spray results and EPDM isolation pads between dissimilar metals — see our corrosion protection guide and certifications & test reports.
Design standards buyers should ask about
Wind is the load that fails arrays. Depending on market, the structural calculation should reference ASCE 7 (Americas), EN 1991-1-4 (Eurocode projects), AS/NZS 1170.2 (Australia, Pacific and parts of Southeast Asia), NBR 6123 (Brazil) or the applicable local code, plus roof standards such as MCS 012 in the UK — our global design wind speed reference explains how these differ. A serious supplier provides a stamped structural calculation for your site’s wind speed, exposure and roof zone: Solaracks issues a stamped design and quote within 24 hours from site inputs.
What information do you need for a mounting quote?
Project location (for wind/snow data), module dimensions and count, roof type and material or soil condition, desired tilt angle, minimum clearance, and any site drawings. With these six inputs an engineered layout and BOM can be produced — request a quote, or see how we support EPC teams.
FAQ
How long does a solar mounting structure last?
Quality aluminium and coated-steel systems are designed for a 25–30 year service life, matching the module warranty period. Solaracks aluminium racking carries a 12-year product warranty, and ZAM and steel structures carry 10 years.
What is the difference between ballasted and penetrating mounting?
Ballasted systems hold the array by concrete weight and never open the roof or ground surface; penetrating systems anchor mechanically into the structure or soil and resist higher wind loads with less added weight.
Which is better for solar racking, aluminium or steel?
Aluminium is lighter and corrosion-resistant, preferred on rooftops; coated steel is stronger per dollar, preferred for ground-mount posts and carports. Most large projects combine both.
How much does a solar mounting structure cost?
Typically a small share of total plant CAPEX, driven by wind zone, roof or soil type and metal prices. Compare per-kW quotes against a stamped structural design rather than per-kg prices.
Can solar panels work as a shade structure?
Yes — carports and elevated arrays double as shade. Steeper tilts and longer spans require upgraded supporting steel.
