Solar Module Mounting Structures: Ground-Mount vs Rooftop Design Considerations
Ground-mount solar structures are engineered for wind and soil conditions over open land and use hot-dip galvanized steel for decades of outdoor life. Rooftop structures are lighter, must respect roof load limits and waterproofing, and use ballasted or anchored designs. Both follow IS 875 wind-load design and IS 2629 galvanizing.
Solar module mounting structures (MMS) hold panels at the optimum tilt for decades. Ground-mount and rooftop systems have distinct design drivers.
Ground-Mount MMS
Designed for open land, ground-mount structures must resist site wind loads (IS 875) and transfer them through foundations into the soil. Hot-dip galvanized steel (IS 2629) ensures 25+ year outdoor life.
- Foundation: driven pile, screw, or concrete
- Tilt: fixed-tilt optimised to latitude
- Finish: hot-dip galvanized for longevity
Rooftop MMS
Rooftop structures must respect the roof’s structural load limit and waterproofing. They use lightweight, ballasted, or mechanically anchored designs depending on roof type (RCC or metal sheet).
- Minimise roof penetrations / protect waterproofing
- Respect dead + live load limits of the roof
- Aluminium or galvanized steel framing
Frequently Asked Questions
What wind-load standard applies to solar structures in India?
IS 875 (Part 3) governs wind-load design; structures are verified for the site’s basic wind speed.
Why are solar structures hot-dip galvanized?
HDG (IS 2629) gives decades of corrosion protection for steel exposed outdoors for the 25+ year life of a solar plant.
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