Passive solar tracking systems explained

How a passive solar tracking system works

A thermo hydraulic system consisting of two tube tanks is placed at the sides of the photovoltaic panels, if the PV array is not aligned with the Sun, the fluid in the tanks will heat unevenly resulting in pressure difference that will drive the fluid through a connecting pipe into the tube tank with the lowest temperature.

The liquid is moved from side to side and this allows gravity to turn the tracker to follow the sun, the shift in weight will cause the photovoltaic solar panels to rotate and face the Sun.

Passive solar tracking systems advantages:

  • Less expensive than active solar tracking systems.
  • More reliable and in need of less maintenance.
  • Do not consume electricity and require no motor.
  • Less likely to suffer lightning damage.

Passive solar tracking systems disadvantages:

  • Not as efficient as active solar tracking systems.
  • Tend to be sluggish, particularly in the morning.