Centralized solar tracker (multi-row)

STI-H1250™ is the most efficient tracker on the market with fewer than 4 drives per MWp installed. Its actuator has a high-performance geared motor with 250 W of power. IEC 62817 certified.

STI-H1250™ horizontal single-axis solar tracker

The STI-H1250™ solar tracker consists of a series of torsion beams oriented in a North-South direction on which the photovoltaic modules are supported. They follow the path of the sun thanks to a single automatic energy-efficient drive system.

The tracker control system is programmed with an astronomical calculation algorithm of the sun's path. It includes backtracking mode to avoid shadowing between rows that improves production by up to 5%, as well as the stow positioning to protect the tracker in extreme wind conditions.



STI-H1250 is a multi-row solar tracker with a rotation range of ±55 degrees, free of buckling effects that makes possible to minimize the number of drives. The reliability of the plant is increased by reducing critical points, scoring, wiring, auxiliary equipment, O&M costs, and power consumption.

Highly reliable upper rotary drive, with our in-house patented system

Highly reliable upper rotary drive, with STI Norland's in-house patented system

Minimum number of drives and power consumption per MW

Minimum power consumption and number of drives per MW

More than 10 years in operation

More than 10 years in operation and proven success

Control and Communications System

The STI-H1250™ centralized solar tracker includes a in-house control and communications system.

  • High reliability and maximum availability of operation.
  • Easy to replace components.
  • Less O&M tasks, saving time and costs.
  • Simple integration with the PV plant’s SCADA, allowing fast configuration of tracker status alarms.
  • Stow positioning fully configurable to protect the structure and the solar modules in extreme wind conditions.
  • PLC with integrated web server: access to alarm log and tracker positioning to ease O&M tasks.

Instalation and maintenance

Thanks to the simplicity of its structure and its modular design, installation time is shortened. In addition, the learning curve for its assembly is very fast, enabling the quick training of installers and eliminating downtime.

  • 100% screwed or bolted joints. No need for welding, cutting or drilling on site.
  • Great adaptability to terrain and adjustment. High tolerances for foundation positioning error, both on the three axes (X, Y, Z) and rotation on the Y and Z axes.
  • Assembly tools provided for an installation free of continuous metric verifications.

What’s more, the wide variety of foundations to which it adapts makes the STI-H1250™ tracker installable on virtually all types of terrain, minimizing and even eliminating the need for earth moving. 

Installation types available

Direct pile driving

Direct pile driving

Indicated for cohesive soils of medium-firm consistency and granular soils of medium to dense consistency.

Pile driving with pre-drilling

Pile driving with pre-drilling

Indicated when direct pile driving is not possible due to the presence of localized rocky areas.

Concrete micropile

Concrete micropile

Indicated for soils with poor geomechanical properties, high aggressiveness or presence of rock.

Screw pile

Screw pile

Indicated for soils with a high content of vegetation and also for mixed soils with deep layers of rock and granular strata on the surface.

Concrete pad

Concrete pad

Indicated for landfill areas.

Technical specifications

General characteristics
Type of structureHorizontal single-axis tracker (HSAT)
Estimated surface area per 1 MWp2 ha (1/GCR=3)
Dimensions (standard tracker with 72 cell modules and 1/GCR = 3)
Modules per torsion beam60 (1,500 V) or 40 (1,000 V) vertical configuration
No. of torsion beams18 (1,500 V) or 14 (1,000 V)
Installed peak power (with 340 Wp module)252 kWp (1,500 V) or 294 (1,000 V)
Total installed module area:  

Up to 1.500 m2 / 16,145 sq ft

Module height. Tracker in 0º horizontal position

1,5 m / 4.92 ft 

Module height. Tracker in 55º horizontal position

2,2 m / 7.2 ft // 0,4m / 1.3 ft 

Rotation drive
Type of driveRotary electromechanical
Drive assembly power inputThree phases, 380-480 Vac, 50/60 Hz
Drive assembly power consumption

<0.5 Kwh/day

Motor power220V wired
Mechanical specifications
Rotation range110º (+/- 55º)
Max wind speed (in horizontal position)140 km/h / 87 mph (adaptable to each project)
StructureHot-dip galvanized steel
Control system
Tracking controlCalculation of algorithm by industrial PLC
Shadow managementCustomized backtracking algorithm
Wind managementStow position configurable by the user
Tilt sensorBy IP68/IP69K inclinometer
Communications standardEthernet (Modbus TCP/IP)
Maintenance periodMinimum
Standard10-year structural warranty / 5-year product warranty

Can we help you?

If you would like more information about our products and services, please provide us with your contact details and we will be in touch shortly.