Have you ever wondered about the benefit of a dual-axis tracker over a fixed array? Based on a comparison of two PV systems, the tracker is worth the additional cost, if you have the right conditions for installation of a tracker. Part of the increase in production shown in the graph is related to the way a tracker handles snow – it cleans itself off after a storm, whereas a fixed array (roof mount in this case) does not. Note that the tracker came online on June 5 late in the day.
As you can see in the graph, the tracker out-performed the fixed array, especially in the winter when there was significant snow cover on the roof (January and February). While December 2014 was a bad month for PV by all measures, the tracker was able to produce more than double the amount of power than the fixed array. The average production of the tracker over a 10-month period is around 37% more than the fixed array.
If you are interested in more information about trackers, or PV in general, please contact us. We would love to help you.