About the Maintenance Walkway
Maintenance walkway design calculates the required width, load rating, and placement of access walkways between panel rows in a solar plant — ensuring safe access for cleaning, inspection, and repair without risking falls or panel damage.
How to calculate it
- 1Minimum walkway width: 600 mm for single-person access (cleaning); 900 mm for equipment movement.
- 2Walkway surface: anti-slip grating or checker plate. Load rating: minimum 3 kN/m² for maintenance personnel.
- 3For rooftop plants: walkways must not penetrate the waterproof membrane — use non-penetrating clip-on walkway systems or rubber-padded raised walkways.
- 4Walkway frequency: every 4–6 panel rows (so no panel is more than 2–3 rows from a walkway).
- 5Edge protection: at rooftop perimeters and any walkway height change > 600 mm, install guard rails (minimum 1 m high, per IS 3696).
Worked example
A 200 kWp rooftop plant with 5 rows of panels, row pitch 3.5 m. A 700 mm walkway between rows 2–3 gives max 2-row reach for cleaning on each side. Walkway: rubber-padded aluminium grating, no membrane penetrations. Edge guard rail along the parapet-side walkway edge.
What you can calculate
- Min 750mm aisles
- Cross-aisle count
- NBC 2016
- O&M clearance
Frequently asked questions
Is a maintenance walkway mandatory for rooftop solar in India?
No specific national code mandates walkways, but MNRE and most state DISCOM inspection requirements check for safe access provisions. Some local fire codes require clear 1 m fire-access paths to all electrical equipment. Practically, walkways reduce cleaning costs significantly — panels accessible from a walkway are cleaned faster, more thoroughly, and with lower risk of panel damage or worker injury.
How are maintenance walkways costed in a solar project budget?
For rooftop plants, non-penetrating rubber-padded walkway systems cost ₹800–1,500/running metre (aluminium grating + supports). A 20 m walkway on a 100 kWp system adds ₹16,000–30,000 — about 0.3–0.5% of project cost. This is routinely included in the BOS (Balance of System) cost and is a standard line item in MNRE benchmark cost estimates.
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