A photovoltaic ground-mount system is expected to perform reliably for 25 years or more, but many older plants are facing structural fatigue, coating failure, and corrosion well before the end of their lifecycle. The ZAM Steel Ground Structure Systems Refurbishment offers a technically sound solution: a hybrid-material ground-mount platform that combines ZAM-coated steel, SUS304 stainless steel, and AL6005-T5 aluminium alloy to reinforce or selectively replace aging assets without a full demolition.
For EPC contractors, asset owners, and O&M teams managing open-area solar farms in high-wind, heavy-snow, or corrosive environments, this refurbishment approach focuses on extending service life while optimizing structural performance.
What Is ZAM Steel Ground Structure Systems Refurbishment
The ZAM Steel Ground Structure Systems Refurbishment is not a one-size-fits-all replacement kit. It is a modular upgrade strategy for existing ground-mount PV plants.
Core material configuration includes:
- S350GD-ZM: high-strength ZAM-coated steel for primary structural members, delivering superior cut-edge corrosion resistance.
- SUS304: stainless steel fasteners and washers to minimize bi-metallic corrosion at joints.
- AL6005-T5: aluminium alloy components for weight-sensitive elements.
This hybrid design addresses a common problem in older HDG (hot-dip galvanized) steel structures: edge rust, drilled-hole corrosion, and coating breakdown at interfaces. By introducing ZAM steel into a refurbishment scope, the system leverages the alloy’s self-healing cut-edge protection while keeping the existing compliant foundations in place.
Why ZAM-Coated Steel Changes the Refurbishment Equation
Traditional HDG steel has a known weakness: once the coating is cut, drilled, or welded on-site, the exposed edge becomes a corrosion starting point. In a refurbishment scenario—where new components must interface with old steel—this is a critical risk.
ZAM (Zinc-Aluminum-Magnesium) coating changes the dynamic. The magnesium in the alloy enables a self-healing response: when moisture reaches a cut edge or drill hole, zinc, aluminum, and magnesium ions migrate to form a dense protective layer over the exposed steel.
For refurbishment projects, this means:
- cut edges on new ZAM components require less on-site touch-up.
- drilled holes at connection points are passively protected.
- the interface between old HDG steel and new ZAM members is more forgiving when properly isolated with SUS304 hardware and sealing washers.
Engineering Parameters for Open-Area Solar PV Installation
The ZAM Steel Ground Structure Systems Refurbishment is engineered for open-area solar PV installations with demanding site conditions.
Key specifications:
- Tilt angle: 0° to 60°, suitable for fixed or adjustable configurations.
- PV module compatibility: framed and frameless modules.
- PV orientation: portrait and landscape.
- Wind load: up to 60 m/s.
- Snow load: up to 3.6 KN/M².
- Building height: up to 20 m.
- Installation site: open area.
These parameters matter for refurbishment because they define whether new ZAM components can be matched to the original plant’s structural envelope or whether a re-engineered layout is required.
Bi-Metallic Isolation: SUS304 and AL6005-T5 in Practice
A refurbishment project often brings dissimilar metals together. When ZAM steel, stainless steel, and aluminium meet, galvanic corrosion is a valid concern.
The engineering approach in this system uses SUS304 stainless steel as a neutral fastening element. With a corrosion potential close to aluminium and a small surface area relative to the joined plates, SUS304 bolts and washers minimize galvanic current density. When paired with bonded neoprene sealing washers, the connection provides long-term isolation.
AL6005-T5 aluminium alloy is used where weight reduction is beneficial—typically in rail sections or module attachment components. The result is a structure that balances the high strength of steel with the lightweight handling of aluminium.
Refurbishment Scenarios: When to Upgrade With ZAM Components
Aging PV Plants With Edge Rust on HDG Structures
Older plants with hot-dip galvanized steel often show the first signs of corrosion at cut edges, bolt holes, and weld zones. A full teardown is expensive and disrupts energy yield. Selective replacement with ZAM components allows asset owners to reinforce compromised bays, replace corroded rails, or upgrade torque tubes without removing the entire racking system.
Capacity Upgrade and Repowering
When a plant undergoes module replacement or inverter upgrades, the structural system should be reassessed. The modular nature of the ZAM refurbishment kit allows partial upgrades aligned with equipment replacement cycles.
High-Wind Regions and Coastal Zones
Open plains, coastal areas, and plateau regions with frequent storms demand structures rated for extreme wind. The 60 m/s wind rating combined with ZAM’s salt-spray resistance makes this system suitable for projects exposed to salt-laden air.
High-Latitude and Alpine Installations
Snow loads up to 3.6 KN/M² and tilt angles up to 60° support optimized winter production in Scandinavia, Canada, the Alps, and northern China. The ability to mount frameless glass-glass modules also improves snow shedding—an important factor in alpine environments.
Agri-Voltaic Ground Mounts
Open-area installations above crops or grazing land benefit from adjustable tilt (to balance light transmission for agriculture) and ZAM’s resistance to agricultural chemicals and irrigation humidity.
Cut-Edge Protection During Refurbishment Joints
When new ZAM components interface with existing galvanized structures, the cut edges, drilled holes, and weld zones on the original steel should be treated to maintain coating continuity.
Best practices for refurbishment joints include:
- cold-galvanizing spray on exposed original steel edges.
- ZAM-matched repair paint at modified zones.
- SUS304 fasteners with sealed washers to isolate dissimilar metals.
- torque verification for stainless bolts at retrofitted connections.
While ZAM’s self-healing property partially compensates for minor scratches, systematic protection at refurbishment joints ensures the upgraded structure meets its design-life targets.
How It Fits the Top Best Solar Product Portfolio
Top Best Solar supplies a range of solar mounting solutions, including ground mounting systems, roof mounting systems, solar hooks, roof clamps, and cable management products. The ZAM Steel Ground Structure Systems Refurbishment complements this portfolio by addressing the growing demand for lifecycle asset management and structural upgrades.
- ground mounting system
- solar PV installation structure
- ZAM coated steel solar racking
- S350GD-ZM photovoltaic mounting
- open area solar farm refurbishment
If your plant needs a full structural reassessment, start with the ZAM Steel Ground Structure Systems Refurbishment. For new-build projects, explore our standard ground mounting system series.