Single-Axis Versus Dual-Axis Sun Trackers – Advantages And Disadvantages
Finding the right sun tracker requires you to make decisions based on a number of variables, from the terrain and the climate to the type of solar panels you’re planning to use. Single-axis and dual-axis trackers are two of the styles that are often used; each has its share of advantages and disadvantages, so you need to familiarise yourself with them before reaching a final decision.
Single-Axis
These sun trackers have a single degree of flexibility that serves as an axis of rotation. Whilst it’s usually aligned along a north-south pathway, it’s possible to align the rotation in any cardinal direction.
· Advantage – They are generally cheaper than their dual-axis counterparts, which is great if you’re working on a lower budget or need to invest in a lot of similar pieces.
· Disadvantage – They have a lower energy output during sunny conditions (when compared to dual-axis trackers), which means that they may not operate as efficiently.
· Advantage – They have a higher reliability than their dual-axis counterparts, so you can rest assured that your results will be accurate and will feel the need to crosscheck less.
· Disadvantage – There has been fewer technological advancements, so some argue that their technology is slightly outdated and that there aren’t many advancements to be made in the future.
· Advantage – They have a longer lifespan than other available styles, so you won’t have to worry about replacing them often. In some cases, they can last for years without issue.
Dual-Axis
These trackers, on the other hand, allow for two degrees of flexibility and offer a much wider range of motion. The primary and secondary axes work together so that solar panels are pointed at specific points.
· Disadvantage – They have higher mechanical complexity, which makes it more likely for something to go wrong with their operation. Having to replace or fix a tracker can be costly.
· Advantage – They have a higher degree of flexibility than other styles thanks to their dual axes and wider range of motion, allowing for a higher energy output on sunny days.
· Disadvantage – They have a shorter lifespan and lower reliability than their single-axis counterparts. You will need to replace them more regularly and may be suspicious of results.
· Advantage – They offer a higher degree of accuracy when it comes to directional pointing, leading to more accurate results. This is because you can point the panels at specific points in the sky.
· Disadvantage – They provide unreliable performance in cloudy or overcast weather, so any results gathered during such times should be discarded as likely not being correct.
Single-axis sun trackers tend to be the better choice for those working on a lower budget or in areas that experience frequent cloud cover. Dual-axis trackers, on the other hand, tend to be the better choice for areas with high levels of direct sun. Ultimately, your decision will all come down to your application – but don’t forget to consider the terrain, climate and lifespan, too.
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