There is an instructables DIY solar tracker unit on instructables.com that uses this unit, I would try to contact the guy who made that to get an idea about reliability

Sun tracking in the solar panel is done by a solar tracker (a computerized or timer device) which basically orients a payload towards the sun.

There are two parts to a solar tracker. One is the mechanical part. This includes the motor, sensors, actuator, frame and other mechanical parts. The second is the electronics that move the tracker. If you want to look at the electronics for CSP, CPV or PV check out our website www.suntrack.es. We have a number data sheets and accessories. Please contact me if you need assistance.

Mike

morshan@p4q.com

Solar Tracking Conrollers

The amount of power generated by a solar tracker depends upon the type of tracking system used. A fixed tracker will produce less electricity than an active tracker because a fixed tracker only creates maximum energy when the sun is directly in line with the panel. Active trackers follow the sun and produce consistent electricity as the sun moves through the sky. The size of the panel also affects how much power is produced, as large solar installations will obviously generate more electricity than a small panel on a house. Solar panels usually have a number listed on the back that shows the power output you can expect in ideal conditions, but this is not usually what is actually produced. Generally, a standard solar panel on a house can produce about 200 watts of power each day.

Assemblies of solar cells are used to make solar modules which are used to capture energy fromsunlight. When multiple modules are assembled together (such as prior to installation on a pole-mounted tracker system), the resulting integrated group of modules all oriented in one plane is referred to in the solar industry as a solar panel. The electrical energy generated from solar modules, referred to as solar power, is an example of solar energy