Question 1

Who is the leading solar mounting structure exporter from India?

Accepted Answer

There's no verified leader here either. Solar structure manufacture is spread across several Indian hubs supplying both domestic utility-scale projects and export. What actually separates suppliers is verified wind and snow-load engineering, IS 875 design compliance and hot-dip galvanizing thickness, not capacity claims. Vajra International manufactures ground-mount and rooftop solar structures in Howrah to IS 875 and ASTM A123.

Question 2

What is the HS code for solar mounting structures exported from India?

Accepted Answer

Steel solar mounting structures typically export under HS 73089090 (other structures and parts, iron/steel); aluminium rail and clamp components fall under HS 76169900 (other articles of aluminium). Confirm the exact subheading for your specific BOM with your customs broker. HS 7308 clears at 0% duty into the UAE under India–UAE CEPA with a valid Certificate of Origin.

Question 3

What is the GST rate on solar mounting structures in India?

Accepted Answer

Solar structures sit under HSN 7308/7616 and carry 18% GST domestically. Exports ship zero-rated, under an LUT with no IGST or with IGST paid and refunded. An overseas buyer's FOB or CIF price carries only their own country's import duty, not Indian GST.

Question 4

Ground-mount or rooftop mounting: which solar structure do I need?

Accepted Answer

Ground-mount fixed-tilt tables on pile or ramming foundations are the default for utility-scale and open-land solar farms. Rooftop systems, rail-and-clamp for pitched roofs, ballasted frames for flat roofs, suit commercial and industrial rooftop solar where land isn't available. The choice comes down to site type, not project size; a large C&I rooftop still needs a rooftop system, not ground-mount.

Question 5

What is the price of solar mounting structures from India?

Accepted Answer

For mild-steel hot-dip galvanized ground-mount fixed-tilt structures, budget roughly USD 45,000 to 70,000 per MWp depending on table design, pile type and wind zone. Rooftop ballasted runs approximately USD 30,000 to 50,000 per MWp, rooftop penetrating USD 25,000 to 40,000 per MWp. These are budgeting ranges; confirm against your site wind data and module spec for a firm quote.

Question 6

Pre-galvanized or hot-dip galvanized: which finish for solar structures?

Accepted Answer

Hot-dip galvanized after fabrication (IS 4759 / ASTM A123, 65 to 85 microns) is the right call for any outdoor solar structure expected to last 25 to 30 years, since it coats every cut edge and drilled hole. Pre-galvanized GI coil, around 20 microns, is cheaper but leaves bare cut edges that rust-track within the first wet season at humid or coastal sites. Specify HDG for the main structure and purlins on any serious project.

Question 7

What wind load standard applies to solar mounting structures in India?

Accepted Answer

IS 875 Part 3 is the Indian standard for wind loads on structures and the basis for most India-origin solar structure design. Export projects should also confirm the destination country's standard: ASCE 7 for the US, EN 1991-1-4 for Europe, AS/NZS 1170.2 for Australia. Wind zone and terrain category vary significantly by site, so this isn't a detail worth skipping.

Question 8

What information do I need to provide for an accurate solar structure quote?

Accepted Answer

Site location and basic wind speed (or wind zone per your local standard), snow load if applicable, module dimensions and weight, array configuration (modules per row or table), pile or foundation type, tilt angle, ground clearance and project MWp. Without these, any quote is indicative only and will likely change once the structure is actually engineered.

Question 9

What documents come with a solar structure export order?

Accepted Answer

Commercial invoice and packing list with correct HS codes, Mill Test Certificates for structural steel, hot-dip galvanizing certificates stating zinc thickness, a structural calculation report to the site-specific design code, and a Certificate of Origin for duty relief under applicable trade agreements.

Question 10

Is there a minimum order quantity for solar mounting structures?

Accepted Answer

Solar structure orders get sized to project MWp rather than a fixed piece-count minimum, and a 1 MWp order is a realistic entry point for export container economics. Tell us your project capacity and site wind data and we'll confirm the most efficient shipment plan.

Question 11

What is the lead time for solar structure export from India?

Accepted Answer

Standard ground-mount and rooftop structures typically ship in 5 to 8 weeks from order confirmation once the structural design is finalized against your site wind and snow data, depending on project MWp and current factory load. Design finalization, confirming wind zone, module spec and layout, is usually what sets the schedule, so provide that data early.

Question 12

Fixed-tilt or single-axis tracker: which should I specify?

Accepted Answer

Fixed-tilt is cheaper, simpler and the default for most utility and C&I projects. Single-axis tracker (SAT) increases energy yield 20 to 25% by rotating east-west through the day, but it adds cost, complexity and moving parts: motor, controller, bearings. Trackers typically pay off above roughly 5 MWp in a good-DNI zone; below that, fixed-tilt usually wins on total cost of energy.

Question 13

What steel grade is used for solar mounting structures?

Accepted Answer

IS 2062 structural steel, typically grade E250, is the standard base material for solar mounting structure members, hot-dip galvanized after fabrication. Confirm the grade on the Mill Test Certificate. Commercial-quality steel substituted for structural grade is a corner some lower-cost suppliers cut under wind-load pressure they haven't actually calculated for.

Question 14

How do I check if a solar structure supplier is a manufacturer or a trader?

Accepted Answer

Ask for the steel MTC from a recent shipment and confirm the grade is genuinely structural, IS 2062 E250 or equivalent. Ask for the galvanizing certificate and the actual zinc thickness, not just "hot-dip galvanized" as a description. Ask for a structural calculation from a comparable project; a manufacturer with in-house engineering can produce this, a trader typically can't.

Question 15

Does Indian solar structure meet international EPC project specifications?

Accepted Answer

Yes. Designing to IS 875 is standard practice for Indian manufacturers, and the same structural family can be certified against ASCE 7, EN 1991 or AS/NZS 1170.2 for export markets, provided the destination site's wind and snow data is supplied. Structural calculations should always reference the destination country's design code for export projects, not just the Indian standard.

Question 16

What foundation types are used for ground-mount solar structures?

Accepted Answer

Driven pile (with soil test data confirming penetration and pull-out resistance), screw pile, or concrete footing are the three main options. Driven pile is fastest and most common where soil conditions allow; concrete footings suit rocky or very soft ground where piling isn't practical. Foundation choice depends on a geotechnical assessment of your specific site, not project size.

Question 17

Aluminium or galvanized steel rail: which for rooftop solar mounting?

Accepted Answer

Aluminium rail is lighter, important where roof load limits are tight, and naturally corrosion-resistant, which makes it the common choice for pitched-roof rail-and-clamp systems. Galvanized steel suits ballasted flat-roof frames where roof load capacity is less constrained and the heavier system's own weight, rather than penetration, resists wind uplift. Check your roof's structural load capacity before settling on a system type.

Question 18

What clearance is needed for bifacial solar modules on ground-mount structures?

Accepted Answer

Bifacial modules need enough ground clearance, typically 1 to 1.5 m minimum and higher for maximum rear-side irradiance capture, plus a reflective or light-coloured ground surface beneath the array to benefit from the rear-side generation. Standard fixed-tilt tables can be raised to suit, but confirm this requirement before finalizing the structure design. Retrofitting clearance later costs far more.

Question 19

Which region of India is best for sourcing solar mounting structures?

Accepted Answer

Several Indian hubs, Kolkata/Howrah among them, have roll-forming and hot-dip galvanizing capacity suited to solar structure fabrication, alongside export logistics through major ports. A manufacturer that also produces structural steel and cable tray can consolidate a shipment for solar EPC projects needing racking plus cable management in one order.

Question 20

What is the difference between IEC 62817 and IS 875 for solar structures?

Accepted Answer

IS 875 Part 3 governs wind loads on the structure itself. IEC 62817 covers the mechanical performance and safety requirements specifically for photovoltaic tracking systems, single- and dual-axis, a narrower standard relevant only when a tracker is specified rather than fixed-tilt. Both may apply together on a tracker project.

Question 21

Can solar structures be supplied with the module clamps and fasteners included?

Accepted Answer

Yes. Mid and end clamps, typically anodized aluminium, along with mounting hardware and fasteners, come matched to the specific module frame thickness and rail profile, so the system installs as a complete kit rather than needing separate fastener sourcing.

Question 22

How is a solar mounting structure quotation priced: per MWp or per tonne?

Accepted Answer

Both get used, depending on the buyer's preference. Per-MWp pricing, common for developer or EPC budgeting, bundles the full structure BOM for a given capacity. Per-tonne pricing suits direct steel-weight comparison across suppliers. Ask for both figures on any quote so you can validate one against the other and check nothing is missing from the BOM.

Question 23

What happens if I order solar structures without providing wind load data?

Accepted Answer

The manufacturer will typically quote against a standard, assumed wind zone as a placeholder, and that price isn't reliable; it commonly changes 15 to 20% once the actual site wind speed is confirmed and the structure is properly engineered. Always provide the site wind speed, or ask your EPC or consultant for it, before treating any solar structure quote as firm.

Question 24

Can Vajra provide a structural calculation report with the solar structure order?

Accepted Answer

Yes. A structural calculation summary showing section sizing against the applicable wind or snow load standard is part of the documentation package, and project engineers and certifying authorities typically want this before approving installation.

Question 25

What is the typical service life of a hot-dip galvanized solar mounting structure?

Accepted Answer

25 to 30 years is the standard design-life expectation for HDG steel solar structures at 65 to 85 micron zinc thickness in most environments, matching typical PV module warranty periods. Coastal, high-humidity or industrially polluted sites cut that life short if pre-galvanized material gets used instead of HDG, and this is the factor buyers underweight most often when comparing quotes on price alone.

Question 26

What's the difference between pile-driven and concrete-foundation ground-mount?

Accepted Answer

Pile-driven (rammed) foundations are fast (10–15 modules per day per crew), reusable and require no curing time, they suit good soil and large utility plants. Concrete foundations (drilled or pad) are needed where soil is rocky, expansive (black cotton), or where load is high. Most Indian and Middle East utility solar runs pile-driven; African projects often go pad.

Question 27

How is the structure sized for wind?

Accepted Answer

Sizing follows IS 875 (Part 3) in India, ASCE 7 in the US, EN 1991-1-4 in Europe and AS/NZS 1170.2 in Australia. The site basic wind speed and topography decide the design pressure. For Indian cyclone zones (East Coast, Gujarat), basic wind speed 50 m/s drives the section sizes.

Question 28

What's the right galvanizing for a 25-year solar plant?

Accepted Answer

Hot-dip galvanizing to ASTM A123 with 85 µm minimum on pre-galvanized members, or HDG to ASTM A123 at 100 µm for piles in aggressive soil. The zinc loss model gives 25 years at most Indian and Middle East sites. Coastal sites near the splash zone need duplex (HDG + paint).

Question 29

Are tracker structures supplied, or fixed-tilt only?

Accepted Answer

Vajra supplies fixed-tilt structures as standard. For tracker projects we fabricate the rollers, torque tubes, gear boxes' mounting brackets and the post bases under license to the tracker OEM (Nextracker, Arctech, Soltec), the tracker EPC supplies the controls.

Question 30

How is the structure aligned to the module layout?

Accepted Answer

The tilt angle and row pitch come from the module datasheet and the latitude-optimised generation calc. Posts are spaced at 4-module, 6-module or 8-module strings; cross-beams hold the module rails. We share the row layout and BOM as part of the supply.

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