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.
Characteristics
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 STI Norland's in-house patented system.
Minimum power consumption and number of drives per MW.
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
Indicated for cohesive soils of medium-firm consistency and granular soils of medium to dense consistency.
Pile driving with pre-drilling
Indicated when direct pile driving is not possible due to the presence of localized rocky areas.
Concrete micropile
Indicated for soils with poor geomechanical properties, high aggressiveness or presence of rock.
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
Indicated for landfill areas.
Technical specifications
| General characteristics | |
|---|---|
| Type of structure | Horizontal single-axis tracker (HSAT) |
| Estimated surface area per 1 MWp | 2 ha (1/GCR=3) |
| Dimensions (standard tracker with 72 cell modules and 1/GCR = 3) | |
|---|---|
| Modules per torsion beam | 60 (1,500 V) or 40 (1,000 V) (vertical configuration). |
| No. of torsion beams | 18 (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 drive | Rotary electromechanical |
| Drive assembly power input | Three phases, 380-480 Vac, 50/60 Hz |
| Drive assembly power consumption | <0.5 Kwh/day |
| Motor power | 220V wired |
| Mechanical specifications | |
|---|---|
| Rotation range | 110º (+/- 55º) |
| Max wind speed (in horizontal position) | 140 km/h / 87 mph (adaptable to each project) |
| Structure | Hot-dip galvanized steel |
| Control system | |
|---|---|
| Tracking control | Calculation of algorithm by industrial PLC |
| Shadow management | Customized backtracking algorithm |
| Wind management | Stow position configurable by the user |
| Tilt sensor | By IP68/IP69K inclinometer |
| Communications standard | Ethernet (Modbus TCP/IP) |
| Maintenance | |
|---|---|
| Maintenance period | Minimum |
| Warranty | |
|---|---|
| Standard | Ten-year structural warranty / Five-year product warranty |
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