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. IEC62817 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. Both rotate by means of a single energy-efficient drive system controlled by an automaton, following the East-West path of the sun.

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



STI-H1250 is a solar tracker with a rotation range of ±55º,  free of buckling effects that makes it possible to minimize the number of drives increasing the reliability of the plant by reducing critical points.  This minimizes the need for ductwork and wiring, investment in 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 our in-house patented system.

Minimum number of drives and power consumption per MW

Minimum number of drives and power consumption per MW

More than 10 years in operation

More than 10 years in operation

Control and Communications System

The STI-H1250 decentralized solar tracker includes a control and communications system with the following characteristics:

  • High reliability and maximum availability of operation.
  • Simple to replace control components.
  • Less cost in O&M tasks.
  • Easy implementation in the plant’s SCADA system for performing O&M tasks, so it is simple to configure tracker status alarms.
  • Stowing management: Stowing table fully configurable by the user to protect the structure and the photovoltaic modules in extreme wind conditions.
  • PLC with integrated web server: Access through web server to alarm log and tracker positioning to facilitate O&M tasks.

Instalation and maintenance

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

For this:

  • 100% screwed or bolted joints. No need for welding, cutting or drilling for its installation.
  • 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 to facilitate assembly without needing constant metric verifications.
What’s more, the wide variety of foundations to which it adapts means the STI-H1250 tracker is installable on 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.

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 1.500m2 / 16,145 ft.2

Module height. Tracker in 0 horizontal position

1,5m / 4.92 ft 

Module height. Tracker in 55 horizontal position

2,2m/7.2ft // 0,4m./1.3ft 

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


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

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