Specialty Concepts SC2 - 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 SC2 charge controller is an integral part of a solar electric power system that includes a PV
solar array and a battery. These items should be installed according to the instructions provided
by the equipment supplier.
SOLAR ARRAY PANELS: The SC2 is compatible with all makes and models of PV panels,
provided the open circuit voltage and the maximum power current of the solar panel does not
exceed the maximum open circuit voltage (Array Voltage, Max Voc) and the maximum charge
current (Charge Current, Max) specifications for the SC2 being used.
HIGHER CHARGING CURRENTS : For arrays exceeding the maximum power current of the
SC2, the array can be divided into smaller parallel sub-arrays. A SC2 can be wired in parallel
to each sub-array, provided the sub-arrays do not exceed the rating of the individual SC2.
BATTERIES: The standard SC2 is designed to be used with the most common lead-acid
batteries. These are wet cell batteries using pure lead, lead antinomy and/or lead calcium
grids. The standard charging set-points should be adjusted when using sealed, maintenance
free batteries, or vented pocket plate nickel-cadmium batteries. This will maximize
performance and battery life. Adjustments in set-points may be made on SC2 models with the
Adjustable Set-Point option (option T). For these batteries, consult the battery manufacturer
for recommended set-points and refer to Table 1 (OPTIONS section) for appropriate settings.
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. DC loads not exceeding the rated SC2 load current (see SPECIFICATION section)
can be connected to the load terminals of the SC2, which provides an additional connection to
battery plus and minus for convenience. Higher current, or inductive loads such as pumps,
motors or inverters should be connected directly to the battery, using properly rated over-
current protection devices (fuses or circuit breakers).
OTHER CHARGING SOURCES: Do not use the SC2 to regulate a power source other than a
solar panel, such as a hydro or wind generator/alternator or an AC battery charger. This could
result in damage to the SC2 and/or the generating equipment. Connect other charging
sources with their own regulation devices directly to the battery, using properly rated over-
current protection devices.
The SC2 and solar panel can remain connected to a battery being charged by other sources,
(alternator, battery charger, etc.) without damage to the control or solar panel.