Campbell Scientific CR9000X Measurement and Control System - Manual (Page 68)

Section 1. Installation
CR9000X batteries. The input is diode protected so the CR9000X batteries
will not leak power to the vehicle if the vehicle's battery is low.
Because the charge input supplies power to charge the CR9000X batteries (up
to two amps when discharged) as well as power for the CR9000X, the current
drawn from the vehicle could be in excess of three amps.
1.2.3 Solar Panels
In a remote installation, large solar panels, in conjunction with large external
batteries and an external regulator/charging circuit, may be used to power the
CR9000X. It may be required to periodically power down the logger to give
the batteries time to recharge. Contact a Campbell Scientific application
engineer for help in configuring a solar powered CR9000X installation.
1.2.4 External Battery Connection
An external battery may be used in place of the internal lead acid batteries of
the CR9000X. The external battery is connected using a special cable
(connector P/N 8879) that is plugged into the CR9000X in place of a standard
battery pack (Figure 1.2-2). It should be noted that the charging circuitry for
the batteries is current limited to 2 amperes.
Reverse polarity protection is NOT provided on these
terminals and CR9000X damage will occur if external
power is connected with reverse polarity. CAUTION
CSI recommends using 16 AWG lead wires or larger when connecting an
external battery to the CR9000X.
FIGURE 1.2-2 Connector for external battery
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