Sun-Link Solar Tracker versus Roof Mount

• The Sun-Link Solar Tracker supplies more energy especially on days with only early morning or late afternoon clear skies. By using the Sun-Link Solar Tracker more air circulation around the solar array keeps cell temperature down, improving cell efficiency (especially important for maximum power point tracking).
• Seasonal adjustments are accomplished from the ground. No more climbing on the roof or fumbling with nuts and bolts, and no danger from a wind gust, just when you are making adjustment.
• Avoid possible building code issues, and additional wind loading, which could contribute to roof separation from the structure especially in older homes. Reduced liability because there is no possibility of the roof leaking.
• Range of adjustment (0 to 80 degrees) is important in snow belt regions. A fixed rack at 45 degrees will accumulate enough snow to prevent charging on cold sunny days. Even partially covered panels lose most of their power output.
• The Sun-Link Solar Tracker is not affected by hot or cold weather, and on bright cloudy days the tracker will position itself to face south. Our tracker doesn't tend to follow the edge of the clouds, and stays in the correct position.

Why choose a Sun-link solar tracker

• When considering the cost of a tracking system don't forget to subtract the value of the fixed mount, so you see the actual added cost.
• It will not move unless there is a significant increase in PV power output. A 1000 watt array can generate all the power the tracker needs for an entire day in 30 seconds of full sun.
• It is immune to electrical disturbances in the DC system caused by charge controls and inverters.
• Sun-Link solar tracker is very efficient by moving in steps, waiting for the sun to pass and following in its path. Typically adjusting every five degrees under full sun.
• The Sun-link Solar Tracker can be customized to suit specific applications, such as an electric seasonal tilt.

Comparing a single axis and a Dual axis tracker.

As the sun climbs over the horizon it travels through about a thousand miles of atmosphere before it reaches the solar array. Even when we point the array exactly at the sun the performance is limited because the light is being scattered and absorbed by dirt and moisture in the air. The first and last hours of the day have limited potential. The sun is about 15 degrees above the horizon before it has good potential.   The total worth tracking is 180 degrees less 30 degrees = 150 degrees and a single axis unit gives you 120 degree of rotation. Also you should remember the 15 degrees of error represents 1 % loss of power.

Dual axis will perform better at summer solstice but no better at equinox and even worse in winter due to the power consumed by 2 motors. Considering the array is likely oversized for summer what is the point of extra cost and complexity.