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2-axis tracker with one fixed axis vs 1-axis trackers
https://forum.pvsyst.com/viewtopic.php?f=24&t=4049
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Author:  Emkey [ Tue Oct 23, 2018 3:53 pm ]
Post subject:  2-axis tracker with one fixed axis vs 1-axis trackers

Hello,

I know the tiltle sound pretty strange, but I'll try to explain myself in the best way possible.

We received a simulation from one of our clients which used a configuration (I will call this configuration A) which is as follows:
  1. Tracking two-axis, frame E-W: Frame min tilt=0°,Frame max tilt=0°, Axis perp Azimuth=0°
We developed an identical configuration with a 1-axis tracker (I will call this configuration B):
  • Tracking Plane, tilted axis: Axis tilt=0°, Axis Azimuth=0°
Basically, configuration B usess a 2-axis tracker as a 1-axis tracker. Now, except for the difference in the computational time (much longer with configuration A), we unexpectedly found a great difference in the annual production (much higher in configuration A), which is given by a "near shading loss" of -2.5%, which concerns only the configuration B.

Could you help me understanding why do we have a different loss when all the other parameters are the same?

I attached a copy of the tracker used in the configuration A, if this helps understanding what I explained above.

Thank you very much,
Marco

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