or concentrating solar reflector or lens toward the sun.
Concentrators, especially in solar cell applications, require a high degree of accuracy
to ensure that the concentrated sunlight is directed precisely to the powered device,
which is at (or near) the focal point of the reflector or lens.
Non-concentrating applications require less accuracy, and a tracker is not necessary,
but can substantially improve the amount of power produced by a system by enhancing morning and afternoon performance.
Strong afternoon performance is particularly desirable for grid-tied photovoltaic systems,
as production at this time will match the peak demand time for summer season air-conditioning.
A fixed system oriented to optimize this limited time performance will have a relatively low annual production.
For low-temperature solar thermal applications, trackers are not usually used,
owing to the relatively high expense of trackers compared to adding more collector
area and the more restricted solar angles required for winter performance,
which influence the average year-round system capacity. Compared to photovoltaics,
trackers can be relatively inexpensive. This makes them especially effective for photovoltaic
systems using high-efficiency panels. Some solar trackers may operate most effectively
with seasonal position adjustment and most will need inspection and lubrication on an annual basis.
A backyard installation of passive single–axis trackers, DC rated at 2340 watts.
Seen here in winter midday position, tilted toward the south.
The tall poles allow walk-under and use of the ground space underneath the panels
for plantings that thrive on protection from the intense midday summer sun at this location.
Seen here in winter midday position, tilted toward the south.
The tall poles allow walk-under and use of the ground space underneath the panels
for plantings that thrive on protection from the intense midday summer sun at this location.