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ANEMOMETER
An anemometer can be attached to the top of the PVmet-500Series in place of the supplied top cap as seen in Figure 4.
Figure 4: PVmet-500Series with a Miniaervane and ultrasonic anemometers
Installation instructions are included with each anemometer. The anemometer is typically located 10m above the ground. Buildings,
trees, and other obstructions can cause turbulent air which may impact the accuracy of the wind speed/direction measurements. To
reduce added inaccuracies the anemometer must be located greater than 10x the height away from any obstructions as shown in
Figure 5.
Figure 5: Minimum distance to obstructions
Even at 10x the distance of the height, turbulent air can cause inaccurate measurements, so it is recommended to use the 10x rule as
an absolute minimum.
SOLAR IRRADIANCE SENSORS
Solar irradiance sensors are sensitive pieces of electronics that require careful installation. The PVmet-500supports up to three solar
irradiance sensors. Typical installations will have a global and plane of array (P.O.A.) with some having a third sensor mounted to
measure diffuse or ground reflected irradiance.
The global irradiance sensor must be positioned with as much exposure to the sky as possible. Errors from reflected light off buildings
or from shading will cause significant errors. Most sensors include a small bubble level to aid in installation but if not equipped a
torpedo level can be used to level the sensor in both axis.
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