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AS 1170.1 AS/NZS 5033
Ground-Mounted Arrays — When and Why
Ground-mounted systems are chosen when the available roof space is insufficient, the roof orientation is unsuitable, or the application is a standalone agricultural or commercial system with available land. They present different engineering challenges from rooftop systems: soil conditions, flood risk, pest access to cabling, and corrosion from soil contact.
Foundation Options
Foundation Type | Soil Condition | Max Wind Load | Installation Method |
|---|---|---|---|
Driven steel tube pile | Most soil types; not suitable for rock | Region D with correct pile embedment | Hydraulic post driver — fast installation |
Concrete pad footings | Any soil | Any wind region — engineered design | Excavation + concrete pour — slow but most reliable |
Helical pier | Soft to medium soils | Region C typical | Screwed into ground — reversible, no excavation |
Ballast block (no foundation) | Hard ground or concrete pad | Region A/B only | Deadweight concrete blocks — suitable for small systems only |
Electrical Requirements Specific to Ground-Mounted Systems
All underground DC and AC cables must be in heavy duty conduit or be armoured cable (minimum 500 mm burial depth, 900 mm under trafficable areas)
Underground cable routes must be marked with warning tape 100–150 mm above the cable
Ground-mounted array frames must be earthed to a dedicated earth electrode (not the building earth alone) — the array's soil earth provides independent ground fault reference
Pest protection: use steel conduit for the first 500 mm above ground level — rodents commonly attack exposed PVC conduit
Minimum panel clearance from ground: 300 mm (vegetation management) to 600 mm (flood-prone areas); check local flood level data
Engr. Jason Morales — Founder, SolarEnergyPH
