opti-solar SC Series User manual

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SC-20LC
12V-24V-48VDC
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SC-30LC
Remote
Panel
12V-24V-48VDC
OPTI-Solar SC Lighting Control Series
SC-10LC/ SC-20LC/ SC-30LC
Installation and Operation Manual
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www.opt i - solar.com
SC-10LC
12V-24V-48VDC

2
1-1 Introduction
1-2 Safety Instruction
The SC Lighting Control Series is an advanced design using a microcontroller for digital accuracy
and fully automatic operation. Each model unit can be used for 12V, 24V and 48V system and can
be operated at three major functions including solar charging, load control and lighting control.
The PWM battery charging has been optimized for longer battery life and the state-of-the-art
auto detector of day and night has been precisely applied to log the different length of night
hours for lighting control no matter where and when (the North or the South, winter or summer)
SC Lighting Control Series is installed. Many specifications of the SC Lighting Control Series
are unique and designed for user-friendly operation. Please take the time to read this operator’s
manual and follow the instruction step by step to help you make full use of many functions that
the SC Lighting Control Series can provide to your solar lighting system.
● This manual contains important instructions that should be followed during
installation and maintenance of the SC Lighting Control Series controller.
● Be very careful when working with batteries. Lead acid batteries can generate
explosive gases, and short circuits can draw thousands of amps from the battery.
Read all instructions provided with the battery.
● Do not exceed the rated current ratings of the controller.
● Do not exceed a battery voltage of 48V (nominal). Do not use a battery less than 12V.
● Charge only 12, 24, or 48 volt lead-acid batteries when using the standard battery
charging programs or NI-CAD batteries when DIP Switch number 3~5 is in the ON
position in the SC Lighting Control Series.
● DO NOT short circuit the PV array or load while connected to the controller. This
will damage the controller.
● The controller should be protected from direct sunlight. Ensure adequate space for
air flow around the controller.
● Do not install a SC Lighting Control Series in a sealed compartment with batteries.
● Never allow the solar array to be connected to the SC Lighting Control Series with the battery
disconnected. This can be a dangerous condition with high open-circuit solar voltage
present at the terminals.
● Pressure terminal connectors are not required. Use only copperwire with minimum
75°C insulation rating and between 10 AWG (5.2 mm2) and 14 AWG (2.1 mm2) gage.
● The negative system conductor should be properly grounded. Grounding should
comply with local codes.

3
1-3 Specifications
MODEL SC-10LC SC-20LC SC-30LC
ELECTRICAL
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Current ratings-Battery Charge
Control 10A 20A 30A
Current ratings-Load Control/
Lighting Control 10A 20A 30A
Accuracy 12/24V: 0.1 % ± 50 mV
48V: 0.1 % ± 100 mV
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Total current consumption While operating -25mA, at idle -3mA
High temp shutdown
90ºC disconnect solar
90ºC disconnect load / diversion load
70ºC reconnect solar / load / diversion load
LVD
11.1V (initial setting)
User select: 10.5V, 11.3V, 11.5V, 11.7V, 11.9V, 12.1V,
12.3V for 12V system
Twice or four times of 12V is for 24V and 48V system
LVR
12.6V (initial setting)
User select: 12.0, 12.8V, 13.0V, 13.2V, 13.4, 13.6, 13.8
for 12V system
Twice or four times of 12V is for 24V and 48V system
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BATTERY CHARGING / Built-in BTS
Charge algorithm PWM, constant voltage
Temp comp. coefficient –5mV/ºC / cell (25ºC ref)
Temp comp. range 0ºC to +50ºC
Temp comp. setpoints PWM, float, equalize (with BTS)
MECHANICAL
Weight 0.3 Kgs 0.4 Kgs
Power terminals 10A Rated 20A Rated 30A Rated
ENVIRONMENTAL
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Cº58+ot55–erutarepmetegarotS
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OPTIONS
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Specifications subject to change without notice

4
1-4 SC-10LC, SC-20LC, SC-30LC Mounting Dimension
Unit: mm
SC-30LC
CHARGE LOAD
BULK
EQUAL
FLOAT
FAULT FAULT
ON
LVR
LVD
LIGHT
TEST
MANUAL
EQU/LVR BVS BTS
Remote
Panel
LIGHTING
CONTROL
OFF 24
6
8
10
2/1
3/1
4/1
6/1
2/2
3/2
4/2
6/2
8/2
D/D
SOLAR BATTERY LOAD
ABSOR
Length
Model 1 LL
SC-10LC / SC-20LC 168 mm 161 mm
SC-30LC 236 mm 229 mm
1-5 RP-SC Remote Panel Dimension
RP-SC
Charge / Load / Light Controller
4 STAGE PULSE WIDTH MODULATED CHARGE CONTROL
PUSH: Display Select
HOLD: Reset Amp-Hours
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12V-24V-48VDC

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SC-30LC
Remote
Panel
5
1-6 Installation Overview
The installation is straight forward but it is important that each step is done correctly and
safely. A mistake can lead to dangerous voltage and current levels. Be sure to carefully
follow the following instructions for all the terminal connection.
Control Terminal Connection
Name Description
PV+ Connecting terminal for Solar Array Positive
PV Connecting terminal for Solar Array Negative
Battery + Connecting terminal for Battery cable Positive
Battery Connecting terminal for Battery cable Negative
Load + / Light + Connecting terminal for DC Load / Light Positive
Load– / Light – Connecting terminal for DC load / Light Negative
Dip Switch 1, 2 Selection of battery voltage for 12V or 24V or 48V system
Dip Switch 3, 4, 5, Battery charge control mode: Battery charging algorithm
Battery charge control mode: Auto / Manual Equalization
Dip Switch 6 Load control mode: Auto / Manual Reconnect
PV+
PV
Battery
Pos +
Battery
Neg
Load+/
Light+
Load–/
Light–
Manual
EQU/LVR
Light
Test
BVS BTS
+
Remote
Panel
Lighting
Control
Switch
Load
Status
LED
Charge
Status
LED
DIP
Switches
12V-24V-48VDC

6
Dip Switch 7 ON: Lighting control
OFF: Load Control
OFF: Lights remain turned off.
2,4,6,8,10: Hours light is turned on after sunset.
2/1, 3/1, 4/1,
6/1, 2/2, 3/2,
4/2, 6/2,
8/2:
Light is turned on after sunset, turned off after the selected
lasting hours, and turned on again before sunrise.
2/1: Light is turned on for two hours after sunset, turned off
after two hours and turned on again one hour before sunrise.
Lighting control
Switch
D/D: Dusk-to-Dawn, light is on all night
Remote Panel Connecting port for the optional LCD remote panel for SC -30LC model
BVS + / Connecting terminal for Battery Voltage Sensor to compensate for voltage
loss due to cable resistance.
BTS Battery Temperature Sensor is built in SC Lighting Control Series for
temperature compensation
LED Status Indicators
Charge Status LED
Blinking Green: Charging is in the state of Bulk or Absorption
Solid Green: Charging is in the state of Float
Solid Orange: Charging in the state of Equalization
Solid Red: Charging in the state of fault: Over Current
Blinking Red: Charging in the state of fault: Over Temp.
Load Status LED
Blinking Green:
If the battery charge state falls below the disconnect setpoint voltage (Initial
setting: 11.1V for 12V system, 22.2V for 24V system and 44.4V for 48V
system) lasting for six minutes, the green LED will blink to be ready for load
disconnection.
Solid Orange:
After six minutes of battery voltage under setpoint, the orange LED will lit to
show the low voltage disconnection for loads.
Blinking Orange:
When the battery voltage recovers to above the reconnect setpoint (Initial
setting: 12.6V for 12V system, 25.2V for 24V system and 50.4V for 48V
system), the orange LED will blink to be ready for reconnection for six
minutes.
Solid Green:
Battery discharges to DC load; after six minutes of reconnection process, the
green LED will be lit to show battery successfully discharges to DC load
Solid Red:
Load control in fault: Load Over Current
Blinking Red:
Load control in fault: Over Temperature

7
Push Buttons
Light Test
Press the Light Test Push Button to enter the testing mode to check if the
Lighting Control Switch has been correctly set in order to control the lights
based on desired timer.
Procedure:
1. Select Dip Switch 7 to be ON
2. Press LIGHT TEST push button until the LOAD LED blinking in green
and red in turns.
3. Count 24 hours a day as 24 seconds so 1 hour equals to 1 second and 12
seconds for day time and 12 seconds for night time.
4. If the Lighting Control Switch is placed at 2, the light load will light for 2
seconds for testing.
5. If the Lighting Control Switch is placed at 3/1, the light load will light for 3
seconds and thenstop for 8 seconds and light again for 1 second.
6. Press LIGHT TEST push button to return to charge battery/load control
state.
PUSH
Manual
Equalize/LVR
When there is a fault occurring, push Manual Equalize/LVR to reset it.
HOLD
Manual
Equalize/LVR
Battery charge control mode: Hold Manual Equalize/LVR to start equalization
and press it again to stop equalization.
Optional Remote LCD Meter for SC-30LC
One Remote LCD Meter can be added to the SC-30LC at any time during or after
installation. The display is a 2x16 LCD meter with backlighting. One pushbuttons is
used to scroll through the displays function.
There are a series of display screens that provide information such as:
•Operating information and data
•Reset Amp-Hours

8
1-7 Installation Steps:
SC-30LC
CHARGE LOAD
BULK
EQUAL
FLOAT
FAULT FAULT
ON
LVR
LVD
LIGHT
TEST
MANUAL
EQU/LVR BVS BTS
Remote
Panel
LIGHTING
CONTROL
OFF 24
6
8
10
2/1
3/1
4/1
6/1
2/2
3/2
4/2
6/2
8/2
D/D
SOLAR BATTERY LOAD
ABSOR
4. Connect the BATTERY first. Be careful that bare wires do not touch the metal case of
the controller.
The BATTERY must be connected before the SOLAR to properly start the
microcontroller.
If the battery voltage is below LVD (low voltage disconnect) which can be selected by
MANUAL EQU/LVR and LIGHT TEST buttons, the load has been automatically
disconnected due to a very low battery charge condition, and the battery must be
recharged.
A battery below 10 volts may not start the microcontroller properly. Make sure the
battery is charged before installing the system.
5. Connect the SOLAR(PV array) next. The green LED indicator will light if the array is
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This section provides a brief overview of how to get started using the SC Lighting ControlSeries
controller. However, please reviewthe entire manual to ensure best performance and years of
trouble-free service.
NOTES:
● The SC Lighting Control Seriesprevents reverse current leakage at night, so a blocking diode
is not required in the system.
● The connectorterminals will accept a maximum wire size of AWG #10 (up to 5.2
mm2). A flathead screwdriveris required. (Some #10 spade connectors may not fit in
this terminal.)
● Tighten each terminal clamping screw to 20 inch-pounds of torque.
● The SC Lighting Control Seriesisdesigned to regulate power from a PV array. Other
generators can be connected directlyto the battery, however, with no effect on the
SC Lighting Control Series.
STEPS:
1. Mount the SC Lighting Control Series on to a vertical surface. Allow a minimum of 5 cm (2 inches)
space above and below the controller for air flow.
2. Make sure the PV andload currents will not exceedthe ratings of the SC Lighting Control Series model
being installed.
3. The connections to the SC Lighting Control Seriesterminalsare shown in the panel drawing.
12V-24V-48VDC

9
connected during the daytime and the array is wired correctly.
※If the SOLAR is disconnected during installation, the controller will see this as the
first night and the length of night will be too short. This will only affect ON/OFF/ON
settings, and will automatically be corrected over 4 days. If the PV array is
disconnected, it is best to disconnect the battery and restart the microcontroller before
leaving the site.
※Remember that the Solar array will generate power whenever in sunlight. Also, be
careful not to shortcircuit the PV array while connected to the controller, since this
will damage the controller.
6. Connect the LIGHT last. If the red LED indicator lights, the battery capacity is low
and should be charged before completing the system installation
7. Set the DIP Switch 1 and 2 for the voltage system, set the DIP Switch 3, 4, 5 for
battery charging algorithm, set the DIP Switch 6 for Auto/Manual Equalization or
Load reconnect, set the DIP Switch 7 for Light or Load Control
8. For most effective surge protection, it is recommended that the negative system
conductor be properly grounded.
9. Turn the rotary LIGHTING CONTROL switch to the lighting option desired.

10
2-1 Operating Modes
2-2 Adjustability of Solar Battery Charging
Seven DIP switches permit the following parameters to be adjusted at the installation site:
DIP Switch Solar battery charging
1 2 Select Battery Voltage
OFF OFF 48V system
ON OFF 24V system
OFF ON 12V system
3~5 Standard battery charging programs
6 (OFF) Manual Equalization
(ON) Auto Equalization
7 (OFF) Load Control
(ON) Lighting control
PWM Battery Charging
There are three distinct operating modes programmed into each SC Lighting Control Series.
Different from SC MPPT Series, only one mode of operation being selected for an individual
unit, SC Lighting Control Series can be operated at Solar Battery Charging mode and DC
Load Control or Lighting control mode at the same time.
Solar Battery Charging
The energy output of a solar array is used for recharging the system battery.
The SC Lighting Control Series manages the charging process to be efficient and to maximize
the life of the battery. Charging includes a bulk charging stage, PWM absorption, float and
equalization.
DC Load Control
When set for DC load control, the SC Lighting Control Series powers loads from the battery,
and protects the battery from over-discharge with a current compensated LVD (low voltage load
disconnect).
Lighting Control
When set for lighting control, the SC Lighting Control Series would detect day and night and
measure the length of night at different time and area zone. The desired lighting hours can be
set for the precise control to turn on and turn off the light in order to achieve power saving.
PWM (Pulse Width Modulation) battery charging is the most efficient and effective
method for recharging a battery in a solar system.
Selecting the best method for charging your battery together with a good maintenance
program will ensure a healthy battery and long service life. Although the SC Lighting
Control Series’s battery charging is fully automatic, the following information is
important for getting the best performance from your SC Lighting Control Series
controller and battery.

11
Four Stages of Solar Charging
Solar Charging Stages
1. Bulk Charging: In this stage, the battery will accept all the current provided by the
solar system.
2. PWM Absorption:When the battery reaches the regulation voltage, the PWM begins
to hold the voltage constant. This is to avoid over-heating and over-gassing the battery.
The current will taper off to safe levels as the battery becomes more fully charged.
3. Equalization: Many batteries benefit from a periodic boost charge to stir the
electrolyte, level the cell voltages, and complete the chemical reactions.
4. Float: When the battery is fully recharged, the charging voltage is reduced to prevent
further heating or gassing of the battery.
Battery Charging Notes
The SC Lighting Control Series manages many different charging conditions and system
configurations. Some useful functions to know follow below.
Solar Overload: Enhanced radiation or “edge of cloud effect” conditions can generate
more current than the controller’s rating. The SC Lighting Control Series will reduce this
overload up to 130% of rated current by regulating the current to safe levels. If the current
from the solar array exceeds 150%, the controller will interrupt charging.
Battery Temperature Compensation: All charging setpoints are based on 25°C (77°F).
If the battery temperature varies by 5°C, the charging will change by 0.15 volts for a 12
volt battery. This is a substantial change in the charging of the battery.
Day-Night Detection: The SC Lighting Control Series will automatically detect day and
night conditions. Any functions that require measuring time or starting at dawn, for example,
will be automatic.

12
Battery Types: The SC Lighting Control Series’s standard battery charging programs are
suitable for a wide range of lead-acid battery types. These standard programs are select by
DIP Switch 3~5.
Standard Battery Charging Programs
The SC Lighting Control Series provides 8 standard battery charging algorithms (programs)
that are selected with the DIP switches. These standard algorithms are suitable for lead-acid
batteries ranging from sealed (gel, AGM, maintenance free) to flooded to L-16 cells and
Ni-cad etc.
The table below summarizes the major parameters of the standard charging algorithms.
Note that all the voltages are for 12V systems (24V = 2X, 48V = 4X).
All values are 25ºC (77ºF).
DIP
Switches
(3-4-5)
A
Battery
Type
B
Bulk
Voltage
C
Float
Voltage
D
Equalize
Voltage
E
Equalize
Time
(hours)
F
Equalize
Interval
(days)
off-off-off 1 – Sealed 14.0 13.4 None - -
off-off-on 2 – Sealed 14.1 13.4 14.2 1 28
off-on-off 3 - Sealed 14.3 13.4 14.4 2 28
off-on-on 4 - Flooded 14.4 13.4 15.1 3 28
on-off-off 5 - Flooded 14.6 13.4 15.3 3 28
on-off-on 6 - Flooded 14.8 13.4 15.3 3 28
on-on-off 7 - L-16 15.0 13.4 15.3 3 14
on-on-on 8-NiCad 16.0 14.5 None - -
Standard Battery Charging Programs
A. Battery Type– These are generic lead-acid and Ni-cad battery types.
B. BULK Voltage–This is the PWM Absorption stage with constant voltage charging.
The “PWM voltage” is the maximum battery voltage that will be held constant. As the
battery becomes more charged, the charging current tapers off until the battery is fully
charged.
C. Float Voltage–When the battery is fully charged, the charging voltage will be reduced
to 13.4 volts for all battery types.
D. Equalization Voltage–During an equalization cycle, the charging voltage will be held
constant at this voltage.
E. Equalization Time–The charging at the selected equalization voltage will continue
for this number of hours. This may take more than one day to complete.

13
F. Equalization Interval–Equalizations are typically done once a month. Most of the
cycles are 28 days so the equalization will begin on the same day of the month. It can
be set by Dip Switch 3~5 for different interval days. Each new cycle will be reset as
the equalization starts so that a setting day period will be maintained.
Temperature Effects
Battery Temperature Sensor (BTS)
A sensor next to the remote panel is used for temperature compensated battery charging.
As the battery gets warmer, the gassing increases. As the battery gets colder, it becomes
more resistant to charging. Depending on how much the battery temperature varies, it
may be important to adjust the charging for temperature changes.
There are three battery charging parameters that are affected by temperature:
PWM Absorption
This is the most important part of charging that is affected by temperature because the
charging may go into PWM absorption almost every day. If the battery temperature is
colder, the charging will begin to regulate too soon and the battery may not be recharged
with a limited solar resource. If the battery temperature rises, the battery may heat and
gas too much.
Equalization
A colder battery will lose part of the benefit of the equalization. A warmer battery may
heat and gas too much.
Float
Float is less affected by temperature changes, but it may also undercharge or gas too
much depending on how much the temperature changes.
The BTS corrects the three charging setpoints noted above by the following values:
• 12 volt battery: –0.030 volts per °C (–0.017 volts per °F)
• 24 volt battery: –0.060 volts per °C (–0.033 volts per °F)
• 48 volt battery: –0.120 volts per °C (–0.067 volts per °F)
Variations in battery temperature can affect charging, battery capacity, and battery life.
The greater the range of battery temperatures, the greater the impact on the battery. For
example, if the temperature falls to 10°C (50°F) this 15°C (27°F) change in temperature
will change the PWM, equalization and float setpoints by 1.80V in a 48V system.
Temperature 12 Volt 24 Volt 48 Volt
50ºC / 122ºF – 0.75 V –1.50 V – 3.00 V
45ºC / 113ºF – 0.60 V – 1.20 V – 2.40 V
40ºC / 104ºF – 0.45 V – 0.90 V – 1.80 V
35ºC / 95ºF – 0.30 V – 0.60 V – 1.20 V
30ºC / 86ºF – 0.15 V – 0.30 V – 0.60 V
25ºC / 77ºF 0 V 0 V 0 V
20ºC / 68ºF + 0.15 V + 0.30 V + 0.60 V
15ºC / 59ºF + 0.30 V + 0.60 V + 1.20 V

14
10ºC / 50ºF + 0.45 V + 0.90 V + 1.80 V
5ºC / 41ºF + 0.60 V + 1.20 V + 2.40 V
0ºC / 32ºF + 0.75 V + 1.50 V + 3.00 V
Temperature Compensation
Equalization
Routine equalization cycles are often vital to the performance and life of a battery —
particularly in a solar system. During battery discharge, sulfuric acid is consumed and
soft lead sulfate crystals form on the plates. If the battery remains in a partially
discharged condition, the soft crystals will turn into hard crystals over time. This process,
called “lead sulfation,” causes the crystals to become harder over time and more difficult
to convert back to soft active materials.
Sulfation from chronic undercharging of the battery is the leading cause of battery
failures in solar systems. In addition to reducing the battery capacity, sulfate build-up is
the most common cause of buckling plates and cracked grids. Deep cycle batteries are
particularly susceptible to lead sulfation.
Normal charging of the battery can convert the sulfate back to the soft active material if
the battery is fully recharged. However, a solar battery is seldom completely recharged,
so the soft lead sulfate crystals harden over a period of time. Only a long controlled
overcharge, or equalization, at a higher voltage can reverse the hardening sulfate crystals.
In addition to slowing or preventing lead sulfation, there are also other benefits from
equalizations of the solar system battery. These include:
Balance the individual cell voltages.
Over time, individual cell voltages can drift apart due to slight differences in the cells.
For example, in a 12 cell (24V) battery, one cell is less efficient in recharging to a final
battery voltage of 28.8 volts (2.4 V/c). Over time, that cell only reaches 1.85 volts, while
the other 11 cells charge to 2.45 volts per cell. The overall battery voltage is 28.8V, but
the individual cells are higher or lower due to cell drift. Equalization cycles help to bring
all the cells to the same voltage.
Mix the electrolyte.
In flooded batteries, especially tall cells, the heavier acid will fall to the bottom of the cell
over time. This stratification of the electrolyte causes loss of capacity and corrosion of the
lower portion of the plates. Gassing of the electrolyte from a controlled overcharging
(equalization) will stir and remix the acid into the battery electrolyte.
NOTE: Excessive overcharging and gassing too vigorously can damage the battery
plates and cause shedding of active material from the plates. An equalization that is
too high or for too long can be damaging. Review the requirements for the
particular battery being used in your system.

15
Standard Equalization Programs
Both automatic and manual equalizations can be performed using the standard charging
programs.
Manual Equalization
The SC Lighting Control Series is shipped with the DIP switch set for manual equalization
only. This is to void an unexpected or unwanted automatic equalization. In the manual mode,
the pushbutton is used to both start or stop a manual equalization. Hold the pushbutton down
for 5 seconds to start or stop an equalization (depending on whether an equalization is in
progress or not).
There are no limits to how many times the pushbutton can be used to start and stop
equalizations. Equalizations will be terminated automatically as per the charging program
selected if the pushbutton is not used to manually stop the equalization.
Automatic Equalization
If the equalization DIP switch is moved to the ON position), the equalizations will begin
automatically as per the charging program selected. Other than starting, the automatic and
manual equalizations are the same and follow the standard charging program selected.
The pushbutton can be used to start and stop equalizations in both the manual and
automatic mode.
Typical Equalizations
The automatic equalizations will occur at the selected charging program from Dip Switch
3~5. When an equalization begins (auto or manual), the battery charging voltage
increases up to the equalization voltage (Veq). The battery will remain at Veq for the
time specified in the selected charging program.
The equalization process will continue until the voltage has been held above the bulk
setting for a cumulate period of two hours. A second manual equalization cycle can be
started with the pushbutton if needed.
If the equalization cannot be completed in one day, it will continue the next day or days
until finished. After an equalization is completed, charging will return to PWM
absorption.
When to Equalize
The ideal frequency of equalizations depends on the battery type (leadcalcium,
lead-antimony, etc.), the depth of discharging, battery age, temperature, and other factors.
One very broad guide is to equalize flooded batteries every 1 to 3 months or every 5 to 10
deep discharges. Some batteries, such as the L-16 group, will need more frequent
equalizations.
The difference between the highest cell and lowest cell in a battery can also indicate the
need for an equalization. Either the specific gravity or the cell voltage can be measured.

16
The battery manufacturer can recommend the specific gravity or voltage values for your
particular battery.
Float
When a battery becomes fully charged, dropping down to the float stage will provide a
very low rate of maintenance charging while reducing the heating and gassing of a fully
charged battery. When the battery is fully recharged, there can be no more chemical
reactions and all the charging current is turned into heat and gassing.
The purpose of float is to protect the battery from long-term overcharge. From the PWM
absorption stage, charging is dropped to the float voltage. This is typically 13.4V.

17
2-3 Adjustability of Load Control
When setting in the load control mode, DIP Switch 7 should be placedat OFF. The LVD
(low voltage disconnect) and LVR (low voltage reconnect) are important setpoints to
protect thesystem battery from deep discharges that could damage the battery.
The Procedure of LVD/LVR Selection
Step 1: Press MANUAL EQU/LVR push button and LIGHT TEST push button at the
same time until the CHARGE LED turns red and LOAD LED turns green in
turns.
Step 2: Press LIGHT TEST push button at one time and observe the CHARGE LED
color and LOAD LED color changing in the following order to select the LVD
and LVR level.
CHARGE LED LOAD LED LVR LVD
Voltage System 12V 24V 48V 12V 24V 48V
Red Red 12.6 25.2 50.4 11.1 22.2 44.4
Red Green 12.8 25.6 51.2 11.3 22.6 45.2
Green Red 13.0 26.0 52.0 11.5 23.0 46.0
Green Green 13.2 26.4 52.8 11.7 23.4 46.8
Green Orange 13.4 26.8 53.6 11.9 23.8 47.6
Orange Green 13.6 27.2 54.4 12.1 24.2 48.4
Orange Orange 13.8 27.6 55.2 12.3 24.6 49.2
Orange Red 12.0 24.0 48.0 10.5 21.0 42.0
Step 3: Press MANUAL EQU/LVR to finish the LVD/LVR level setting procedure.
Inductive Loads (Motors)
For dc motors and other inductive loads, it is strongly recommended to install a diode
near the controller. Inductive loads can generate large voltage spikes that might damage
the controller’s lightning protection devices.
The diode should be installed near the controller, and in the orientation shown in the
diagram below:
noitcetorPedoiD
SC Lighting Control Series

18
The specifications for the diode follow:
• a power diode
• rated equal or greater than 80 volts
• rated equal or greater than 10 amps (SC-10LC) or 20 amps (SC-20LC) or 30 amps
(SC-30LC)
For large inductive loads, a heat sink for the diode may be necessary.
General Load Control Notes
In addition to the inductive loads discussed above, there are a few other load issues that
require attention:
Inverters
Inverters should never be connected to the SC Lighting Control Series
Reverse Polarity
If the batteryis correctlyconnected (LEDs are on), the load should be connected very
carefullywith regard to polarity(+ / –).
If the polarityis reversed,the controller cannot detect this.There are no indications.
Loads without polaritywill not be affected.
Loads with polarity can be damaged. It is possible that the SC Lighting Control Series
will go into short circuit protection before the load is damaged. If the LEDs indicate a
“Fault”, be certain to check for both shorts and reversed polarity connections.
If the controller does not go into short circuit protection, the loads with polarity will be
damaged.
CAUTION: Carefully verify the polarity (+ and –) of the load connections before
applying power to the controller.

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2-4 Adjustability of Lighting Control
When setting in the lighting control mode, DIP Switch 7 should be placed at ON.After
completing the system connections, select the desired LIGHTING CONTROL switch
option. The brief description of the options follows below:
OFF: Lights remain turned off.
2,4,6,8,10: Hours light is turned on after sunset.
2/1, 3/1, 4/1,
6/1, 2/2, 3/2,
4/2, 6/2, 8/2:
Light is turned on after sunset, turned off after the selected
lasting hours, and turned on again before sunrise.
2/1: Light is turned on for two hours after sunset, turned off
after two hours and turned on again one hour before sunrise.
Lighting control
Switch
D/D: Dusk-to-Dawn, light is on all night
To select a lighting control option, turn the rotary digital switch to the desired position.
An arrow in the rotary switch will point to the selected position. This is a digital switch,
so it will click into each of the sixteen positions.
To confirm correct selection of the desired control option, press the LIGHT TEST button
to enter the testing mode.

20
LIGHT TEST Button
Press the LIGHT TEST button to enter the testing mode to check if the Lighting Control
Switch has been correctly set in order to control the lights based on desired timer. The
procedure is listed as below.
STEPS:
Auto Detector for Day and Night
Measure Night Length
1. Select Dip Switch 7 to be ON
2. Press LIGHT TEST push button until the CHARGE LED blinks in red and green in
turns.
3. Count 24 hours a day as 24 seconds so 1 hour equals to 1 second and 12 seconds for
day time and 12 seconds for night time.
4. If the Lighting Control Switch is placed at 2, the light load will light for 2 seconds for
testing.
5. If the Lighting Control Switch is placed at 3/1, the light load will light for 3 seconds
and then stop for 8 seconds and light again for 1 second.
6. After 24 seconds, another cycle of test will continue to activate.
7. Press LIGHT TEST button to return to charge battery/load control state.
The SC Lighting Control Series uses the solar array to detect day and night. The transition to
night requires a solar insulation level less than 2 percent. The transition back to day requires
a high solar array open-circuit voltage. Both state changes require 10 minutes of continuous
transition values before making the change. These constraints avoid false transitions due to
lightning or dark storm clouds.
The LIGHTING CONTROL options that turn the lights on again before sunrise require
that the SC Lighting Control Series measure the length of the night. Therefore, the controller
cannot turn the lights on before sunrise the first night after installation (or after reconnecting
the battery). If the solar array is disconnected during service, the controller will then
measure a faulty night length. Either reset the controller by reconnecting the battery, or
this short “night” will be automatically corrected by the controller after 4 days of
service.
NOTE: The SC Lighting Control Series uses the open circuit voltage of the PV panel to
determine the correct time for dawn and dusk. If the PV panel is covered with debris
(e.g. snow, leaves, dirt), the PV panel voltage may be too low which can cause load
timing errors. If the load is operating erratically, make sure the PV panels are clean, there
are no obstructions shading the array, and the PV panels are oriented to the sun correctly.
The SC Lighting Control Series will automatically correct load timing errors within
4 days of clearing the array.