CR300-Series Datalogger
39
FIGURE 6-3. Lightning Protection Scheme
6.7 Power
6.7.1 Power In
6.7.1.1 Power Sources
The CR300 is designed to receive power from a variety of sources. Following
is a list of CR300 power input terminals and the respective power types
supported.
BAT terminals — voltage input is 10 to 16 Vdc. This connection uses the least
current since the internal CR300 charging circuit is bypassed. If using alkaline
batteries, do not use the CHG terminals. The voltage at BAT is the same
voltage, less 0.3 V, as that available on the SW12V terminal.
CHG terminals — voltage input range is 16 to 32 Vdc. Connect a primary
power source, such as a solar panel or Vac-to-Vdc transformer, to CHG. The
voltage applied to CHG terminals must be at least 0.3 V higher than that
needed to charge a connected battery. When within the 16 to 32 Vdc range, it
will be regulated to the optimal charge voltage for a lead acid battery at the
current datalogger temperature, with a maximum voltage of ≈15 Vdc. A battery
need not be connected to the BAT terminals to supply power to the datalogger
through the CHG terminals.
Highly Conductive
Metal Mast
Copper-Sheathed
Ground Rod
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