Sensaphone SCADA 3000 Users manual - Manual (Page 44)

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SCADA 3000 User’s Manual
In this example, a battery with a capacity of at least 15.6 AH is required to provide 12 hours of
backup time. Note that actual backup time will vary somewhat depending on temperature, bat-
tery age, and dialing activity. The battery connects to the terminals labeled BAT + and - on the
SCADA 3000. (See Figure 2 below)
Note: Only connect the battery while the Power Switch is OFF.
Figure 2: Wiring from optional battery to SCADA 3000
To determine battery backup time: Battery capacity (AH) = 18 AH = 13.8 hrs.
Total Current (A) 1.302 A
Whenever the power switch is turned on and the power supply is plugged in, SCADA 3000 will
automatically charge the battery. The unit also includes special circuity to prevent the battery
from being damaged in the event of an extended power outage. When the battery runs down
to 9V, the unit will automatically disconnect it, preventing deep-discharge damage. The bat-
tery will remain disconnected until main power returns. Note that, once the deep-discharge
circuit has been activated, the unit requires power at the 15V terminals to turn back on, even if
the 12V battery is fully charged. The battery should provide 5 years of service before needing
replacement.
Note: Have battery serviced by qualified service personnel only.
POWeRING THe SCADA 3000 WITH SOLAR CeLLS
The SCADA 3000 is a relatively low-power device (2–4 Watts, depending on options) and is
suitable for operation from solar cells. Typically solar power is only used when AC power is
unavailable or too costly to have service installed at the unit’s location. Proper component
selection is critical to keep the unit functioning during extended periods of darkness or poor
sunlight intensity. Critical applications should overcompensate on capacity to insure that the
unit will continue to function. Component selection will vary depending on your geographic
location. Regions with long periods of low intensity sunlight may not be suitable for solar oper-
ation. Consult with a solar power specialist for specific questions on component selection and
geographic issues.
Providing reliable power from solar cells requires (3) components: one or more solar panels,
one or more large batteries, and a solar battery charger/regulator. During periods of sunlight,
the solar cells will provide enough energy to power the SCADA 3000 and charge the batteries.
When there is no sunlight the batteries will power the unit. The figure below illustrates the
connection between the components: