Specialty Concepts SCT - Manual (Page 4)

I N S T A L L A T I O N
WARNINGS / CAUTIONS
WARNING: Electricity, even low voltage electricity, can be dangerous. Installation should be
performed by a licensed electrical contractor or other qualified personnel only. It is recommended
that the requirements of all applicable local electrical codes (or U.S. National Electrical Code in
the absence of local codes) be followed.
WARNING: Follow all safety precautions of the battery manufacturer and the National Electrical
Code. Proper ventilation must be provided for vented batteries. Most vented batteries produce
hydrogen gas when charging, which is extremely explosive. DO NOT expose the battery to open
flame, matches, cigarettes or sparks.
CAUTION: DO NOT subject the timer to voltages greater than 44 volts. This would be the open
circuit voltage (Voc) of the solar panel, or the sum of the open circuit voltages of all modules
connected in series.
CAUTION: DO NOT exceed the maximum current rating of the SCT, 8 amps, as stated in the
specifications.
TOOLS AND MATERIALS NEEDED:
1 SCT (and possibly the Photo Sensor accessory - see below)
2. Standard screwdriver
3. Wire and wire strippers
4. Drill and appropriate bit: if holes must be drilled in the mounting surface
5. Fasteners to mount unit: Several types are suitable and will depend upon the type of material
of which the wall is made. These are not included with the SCT.
6. Blocking Diode: This may be needed, see below.
7. Small slotted screwdriver: to set run time
8. Stop watch: for accurate run time settings
WHEN A BLOCKING DIODE IS REQUIRED:
A blocking diode is required when the SCT detects sundown by using the solar array (and
not by using the Photo Sensor accessory) Note that the blocking diode is often already
included within the charge controller (such as the ASC controller). In this case, no
additional blocking diode is required.
WHEN THE PHOTO SENSOR ACCESSORY IS REQUIRED:
For systems that are not photovoltaic powered, or PV systems that do not have a blocking
diode, a photo cell sensor is needed to detect night and start a light or other load. The
photo sensor can also be used on systems where the light sensitivity needs to be adjusted.