A solar tracker automatically follows the sun during the course of a day and throughout the seasons of the year.  They generate around 30-40% more energy than a conventional fixed array.  Areas that are exposed to high levels of sunlight or for applications such as solar pumping then trackers are considered the ideal solution.  It may even be worthwhile to consider a tracker when the cost of adding additional solar panels is outweighed by the increase in power obtained from a tracker, thus making them very cost effective.

Trackers also offer advantages over fixed array systems as then can capture more of the available light during day-to-day operating thus making them very efficient.

Top of pole mount Solar Tracker

On days with a high insolation and direct radiation, a tracker system will achieve large efficiency gains.  During summer, this can be around a 40% radiation gain and even more in winter. 

There are different types of tracker systems available - PASSIVE TRACKING, ACTIVE TRACKING and single axis or dual axis tracking.  Single axis tracking is easier to implement as the system can either track the the daily path of the sun or its yearly path.  Solar trackers are ideally suited to water pumping applications as they can be utilised to to increase the amount of water pumped during the course of a day.  As the tracker can be set to dawn and dusk operation this will significantly increase the amount of water pumped during a single day.

Solar trackers use an optical, solid-state sensor to align the modules to the arc of the sun and sun sensors calculate the amount of sunlight falling on the array thus allowing the solar tracker ensure a uniform spread of sunlight on the array.

At night the solar tracker moved into a horizontal position in order to maximise output from the diffused conditions and moves back to the sunrise position on daybreak. l

Solar Trackers from Lorentz

Lorentz offer four different solar trackers depending upon the the size of the solar array required.

ETA Solar Trackers - Single Axis Trackers

The single axis tracker has a manually adjustable tilt angle of 0-45° and automatic tracking of the sun from East to West.

Depending upon the tracker mounting poles are included; galvanised steel frames to fit all commercially available solar panels without any drilling being required; all hardware necessary for the installation; control electrics and drive unit and installation instructions.

Notes on single axis trackers

The ETA-400 requires a 50-90 mm diameter mounting pole. Not included.

The ETA-DIY. Allows cost to be saved by not including steel pole or frames. It is suitable for up to 10 or 15 m2 module area and includes all fixings, motor and controller.

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