Home / Engineering

Engineering · Doctrine, controls & validation

Engineered for the second decade.

The warranty is a commercial document. The load case is an engineering one — and we design to the load case. Here is how a Siddhapura structure is reasoned, built, coated and proven before it ships.

Engineering Doctrine

Design for the load case, not the warranty.

Design reference
Full service life

Doctrine

Every Siddhapura structure is designed against the full service life of the asset — thirty years of wind cycling, thermal movement, dust ingress, hail and coastal corrosion. We size members, drives and foundations to the worst recorded condition at the site, not the code-minimum average.

That means slewing drives over-specified for the governing load case, a controller written and built in-house so we own the firmware our customers depend on, stainless fasteners at every interface that sees weather, and zinc-magnesium-aluminium coatings on the structural members.

It is a more expensive structure to build and a far cheaper structure to own. Engineers specify manufacturers who design for the second decade of operation — not just the first.

DOCTRINE photo — drive assembly, torsion tube interface

Design codes IS 875 Pt 3 · Wind IS 1893 · Seismic IS 800 · Steel ASCE 7 Eurocode EN 1991 IEC 62817 · Trackers ISO 12944 · Coatings

Three Commitments

What we will not compromise.

Held on every
project, every quote

Design to the site, not the spreadsheet.

Each structure is solved for the governing combination of wind, seismic, thermal and soil conditions measured at the project — never a single national default applied everywhere.

Own the control stack.

Hardware, firmware and diagnostics are designed and assembled in-house at Rajkot. No black-box drive from a third party sits in the critical path of an asset we warrant.

Coat for the environment.

The coating class is selected from the site's corrosivity category, C2 to C5, and proven by accelerated test — so a coastal array is never protected like an inland one.

Design Basis

Every structure carries four load cases.

Governing conditions
Verified per project

Wind

60^m/s

Peak three-second gust the structure is designed and stow-tested against, including dynamic and torsional effects.

IS 875 Pt 3 · ASCE 7

Seismic

Zone V

Designed for India's highest seismic zone, with drive mounts and foundations detailed for the resulting demand.

IS 1893 · ASCE 7

Thermal

±60^°C

Slotted connections and movement joints absorb the full diurnal and seasonal range without locking up the table.

EN 1991-1-5

Corrosion

C2–C5

Coating system selected to the ISO 12944 corrosivity category for each site, from mild inland to coastal exposure.

ISO 9223 · 12944

Structure & Materials

Steel chosen for where it will stand.

Coating by corrosivity
Stainless at every weather joint

ZnAlMg

Zinc-magnesium-aluminium coating with several times the cut-edge barrier life of conventional galvanising — the default on structural members.

C4–C5 · structural members

HDG

Batch hot-dip galvanising to a controlled coating mass for posts, foundations and heavy fabricated sections.

ISO 1461

SS 304 / 316

Every interface that sees weather is bolted with stainless hardware. No sacrificial plated bolt sits in the critical path.

A2 / A4 fasteners

AL 6005-T6

Extruded aluminium rails and clamps for rooftop, balcony and coastal work, where weight and corrosion govern the choice.

T6 temper

Tracker Control System

An in-house controller, end to end.

Made in India
Firmware to SCADA

Closed-loop positioning

Every row reports its true angle back to the controller and self-corrects for drift, frost and foundation settlement — without a site visit.

Multi-drive torsional lock

Multiple slewing drives per table with a positive torsional lock eliminate the resonant flutter that brings single-drive trackers down on long rows.

0° high-wind stow

At the storm threshold the table flattens parallel to the ground — the lowest-drag posture a tracker can hold, cycle-tested for the worst sites.

Redundant power & comms

A dual power feed and a meshed communications layer keep a row tracking through a single-point failure rather than parking the whole block.

SCADA-native telemetry

Position, motor current and fault data pipe straight into the asset owner's SCADA stack over open protocols — no proprietary gateway.

Over-the-air firmware

Diagnostics and firmware update across the field from Rajkot. The controller keeps improving long after commissioning.

CONTROLLER photo — controller PCBA & drive head

99%

Guaranteed uptime

±1°

Tracking accuracy

±60°

Tracking range

160 m

Max table length

Testing & Validation

Nothing ships on a spreadsheet.

Five gates
Before volume release

Finite-element analysis

Each structure is modelled and solved for the governing load combinations before a single section is rolled.

FEA
Every platform

Wind-tunnel verification

Aeroelastic behaviour, dynamic amplification and stow loads are verified in the wind tunnel for new table geometries.

Aeroelastic
New geometries

Full-scale fatigue cycling

Drives, bearings and bolted joints are cycle-tested on the bench to represent thirty years of field operation.

30-yr equivalent

Salt-spray & coating audit

Coating samples run accelerated salt-spray to confirm the specified corrosivity class is met before despatch.

ISO 9227

Prototype field trial

A field prototype is commissioned and monitored through a full stow cycle, in person, before volume release.

First row
On site

Engineering Parameters

The numbers, at a glance.

Typical design basis
Tuned per project

Parameter	Design value	Reference
Wind design speed	60 m/s peak gust	IS 875 Pt 3 · ASCE 7
Seismic design	up to Zone V	IS 1893
Tracking range	±60°	Horizontal single-axis
Tracking accuracy	±1°	Closed-loop control
Maximum table length	160 m	Per tracker row
High-wind stow	0° flat	Lowest-drag posture
Guaranteed availability	99%	Contractual
Structural service life	30 years	Design basis
Coating system	ZnAlMg / HDG · C2–C5	ISO 12944
Fasteners	Stainless A2 / A4	At weather joints

Solar Trackers

Fixed Mounting

Carports & Urban

Components

320 MW HSAT 1P · Rajasthan