Specialty Concepts SCS/90 - 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 SCS is an integral part of a solar electric power system that includes a PV solar
array, a battery and a load. These items should be installed in accordance with the
National Electrical Code (NEC) or other applicable code, and with the instructions
provided by the equipment supplier.
SOLAR ARRAY PANELS: The SCS is compatible with all makes and models of PV
panels, provided the voltage and current specifications of the SCS are not
exceeded. These are the maximum open circuit voltage of the array (Array Voltage,
Max. Voc: see Specifications) and the maximum power current of the array (Charge
Current, continuous: 50 or 90 amps).
HIGHER CHARGING CURRENTS : For arrays exceeding the maximum power
current of the SCS, the array can be divided into smaller parallel sub-arrays. A SCS
can be wired in parallel to each sub-array, provided the sub-arrays do not exceed
the rating of the individual SCS.
BATTERIES: The SCS is factory set for the most common lead-acid batteries. These
are wet cell batteries using pure lead, lead antinomy and/or lead calcium grids. For
sealed, maintenance free batteries, or vented pocket plate nickel-cadmium
batteries, the charging set-points should be adjusted to maximize performance and
battery life. Note: For sealed, maintenance free batteries or nickel cadmium
batteries, consult the battery manufacturer for recommended set-points and refer to
Table 2 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 SCS load current (see
specification section) can be connected to the load terminals of the SCS and they
will automatically be disconnected in the event of a low-voltage condition. Higher
current, or inductive loads such as pumps, motors or inverters should be connected
directly to the battery, using properly rated over-current/disconnect devices (fuses
or circuit breakers).
OTHER CHARGING SOURCES: Do not use the SCS to regulate a power source other
than a photovoltaic array, such as a hydro or wind generator/alternator or an AC
battery charger. This could result in damage to the SCS 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 SCS and array can remain connected to a battery being charged by other
sources, (alternator, battery charger, etc.) without damage to the controller or solar
array.