Specialty Concepts SCT - Manual (Page 3)

R E L A T E D S Y S T E M E Q U I P M E N T
The SCT can be an integral part of a solar electric power system that usually includes a solar
panel (or other charging source), a charge controller, a battery and a light or other load. These
items should be installed according to the instructions provided by the equipment supplier, and
this manual assumes that the rest of the equipment installation has been properly completed.
PANELS / CHARGING SOURCES: The SCT is compatible with all makes and models of PV
panels, provided the open circuit voltage of the solar panel (or charging source) does not
exceed 44 volts.
BATTERIES: The standard SCT is designed to be used with lead-acid batteries. Other 12 or 24
volt nominal power sources would be suitable also.
LOADS: The load is considered the item or equipment that the PV system is powering. System
loads such as lights, radios, DC/AC inverters, etc. must be rated for the proper DC input
voltage. The SCT can be used with DC loads not exceeding 8 amps. Higher current, or
inductive loads such as pumps, motors or inverters cannot be switched by the SCT
directly, and should be connected directly to the battery, with a relay controlled by the
timer to provide switching. Properly rated over-current protection devices (fuses or circuit
breakers) should be used.
ACCESSORY - PHOTO CELL SENSOR: For systems that are not photovoltaic powered, or PV
systems that do not have a blocking diode, a photo cell sensor is available to detect night
and start a light or other load.