42
SYSTEM
that the solar panels allow for long term recharge under most natural light conditions. There
may be local obstructions that make another orientation more favorable, however, failure to
orient the instrument to true north will result in erroneous wind direction measurements. The
ATMOS 41W will charge the batteries even during periods of low light levels (e.g., winter time
or heavy overcast conditions)
When considering install location, take into consideration mature vegetation that could
cause shadowing of the panels (
) reducing solar exposure.
Solar
panel
Solar
panel
Figure 23 Solar panels
3.2.10 GPS RECEIVER
The ATMOS 41W has a built-in GPS receiver that provides the latitude, longitude, and
altitude of the instrument. It is designed to provide time fix and location metadata for the
environmental monitoring location. The ATMOS 41W enables the GPS receiver once per day. If
the instrument determines its location has not changed, it turns off the GPS receiver to save
power. If the instrument detects a change, it keeps the GPS receiver powered for as long as
15 min to improve the accuracy of the location fix. Pressing the
TEST button triggers the GPS
receiver to evaluate changes in location (
