ASC-Plus - Specialty Concepts Inc
ASC-Plus
Photovoltaic Charge Controller
INSTALLATION and OPERATION MANUAL
SPECIALTY CONCEPTS, INC.
8954 Mason Ave.
Chatsworth, CA 91311, USA
3 / 1997
Specifications
PARAMETERS
Nominal Voltage
Short Circuit Current, Continuous
Short Circuit Current, Max (60 seconds)
Load Current, Continuous (2)
Load Current, Max (60 seconds) (2)(4)
Array Voltage, Max Voc
Voltage @ Battery for Charging, Minimum
Voltage @ Battery for LVD, Minimum
Quiescent Current
Current Consumption, Charging, Typ.
Current Consumption,
Load Disconnected, Typ. (3)
Voltage Drop, Array to Battery, Typ.
Voltage Drop, Battery to Load, Typ.
Charge Termination
Charge Resumption
Load Disconnect (LVD)
Load Reconnect
Operating Temp. Range
Storage Temp. Range
Temperature Comp. Coef. (from 25°C) (1)
Notes: (1)
(2)
(3)
(4)
UNITS
VALUE
(Volts)
(Amps)
(Amps)
(Amps)
(Amps)
(Volts)
(Volts)
(Volts)
(Milliamps)
(Milliamps)
12
15
18
10
13
26
0
8.5
15
20
(Milliamps)
(Volts)
(Volts) @ 10 amps
(Volts)
(Volts)
(Volts)
(Volts)
(°C)
(°C)
(Volts/°C)
40
.40
.06
14.3 + .2
13.5 + .3
11.5 + .2
13.0 + .3
0 to 50
-55 to 85
-.03
Temperature compensation option
Non-inductive.
LVD relay energized, red L.E.D. on, typical value.
Carry only, Non-switching
PART NUMBERING
Model
EXAMPLE:
Option
ASC-Plus - A
MODEL
OPTIONS
ASC-Plus
A - Temperature Compensation
Specifications and product availability subject to change without notice.
KEY
ASC-Plus
GENERAL DESCRIPTION
The ASC-Plus is a very rugged and reliable battery charge controller and battery monitor for
use in photovoltaic energy systems. This water resistant model is especially well suited in
remote istallations with harsh environmental conditions.
This controller optimizes charging performance from the solar panels while providing overcharge protection to the system batteries, prolonging battery life and reducing maintenance
requirements. These units also feature low-voltage load disconnect (LVD) that can be used
to protect the batteries from deep discharge damage.
A battery fuse is included to provide over-current and reverse polarity protection. The
controller also features lightning protection and reverse leakage protection to prevent any
battery discharge through the solar panels at night. Remote temperature compensation is
available as an option (Option-A).
The ASC-Plus is a negative-ground switching shunt controller housed in an anodized
aluminum chassis and encapsulated in a hard epoxy resin. The terminal block accepts 10
gauge wire (stranded), two 12 gauge wires or a spade connector, providing simple
installation.
FEATURES
CHARGE REGULATION
• 15 amp charge current, 12 volt
• Switching shunt, pulse charging
• Remote temperature compensation
(option)
LOW-VOLTAGE LOAD DISCONNECT
(LVD)
• 10 amp LVD Relay
MONITORING & MOUNTING
• Red, yellow and green battery
condition lights
• Flashing red lights for high and low
voltage warning
• “CHARGING” light
• “LOADS DISCONNECTED” light
• Suitable for outdoor mounting
DESIGN FEATURES
• Encapsulated for protection
• 100% solid state charge controller
• Reverse leakage protection -blocking
diode
• Battery fuse
• Lightning protection
• Input noise suppression
• Low power consumption
• Simple, rugged circuitry
RELATED SYSTEM EQUIPMENT
The ASC-Plus is an integral part of a solar electric power system that includes a PV solar
array, a battery and a load. The load is considered the item or equipment that the PV
system is powering. The system should be installed according to the instructions provided
by the equipment supplier.
SOLAR ARRAY PANELS: The ASC-Plus is compatible with all makes and models of PV
panels, provided the open circuit voltage (Array Voc, Max) does not exceed 26 volts and
the array short circuit current (Current, Short Circuit, Max) does not exceed 15 amps.
HIGHER CHARGING CURRENTS: For larger arrays made up of many sub-arrays, or
when adding to an existing system, an ASC-Plus can be wired in parallel to each subarray, provided that the sub-arrays do not exceed the rating of the individual units. This
method allows higher currents to be handled than allowed by a single ASC-Plus.
BATTERIES: The ASC-Plus is designed to be used with standard lead-acid batteries.
These include wet-cell batteries, sealed maintenance free batteries and gel cell
batteries. Vented pocket plate nickel-cadmium batteries may also be used provided the
number of battery cells in series is a multiple of 5 (for a 12 volt system, 10 cells). Consult
with the battery manufacturer for specific recommended set-points.
LOADS: System loads such as lights, radios, DC/AC inverters, etc. must be rated for 12
volt DC input. DC loads not exceeding 10 amps can be connected to the load control
terminals of the ASC-Plus and they will automatically be disconnected in the event of low
voltage. Refer to Figure 1 for correct installation. Higher current loads, or inductive loads
such as pumps, motors or inverters should be connected directly to the battery and be
properly fused.
OTHER CHARGING SOURCES: DO NOT use the ASC-Plus to regulate a power source
other than a photovoltaic array, such as a hydro or wind generator/alternator or an AC
battery charger. To do so could result in damage to the ASC-Plus and/or the generating
equipment because the ASC-Plus regulates charging by short circuiting the input.
Connect other charging sources directly to the battery.
The ASC-Plus and array can remain connected to a battery that is being charged by an
additional source, (alternator, battery charger, etc.) without damage to the controller or
solar panels.
INSTALLATION
WARNINGS
WARNING: Electricity, even low voltage electricity, can be dangerous. Installation
should be performed by a licensed electrical contractor or other qualified personnel
only. The requirements of the U.S. National Electrical Code should be followed.
WARNING: Follow all safety precautions of the battery manufacturer. Provide adequate
battery ventilation. Most batteries produce hydrogen gas when charging, which is
extremely explosive. DO NOT expose the battery to open flame, matches, cigarettes
or sparks.
CAUTIONS:
CAUTION: DO NOT exceed the maximum array open circuit voltage (Voc) of 26 volts. This
is the sum of the Voc of all modules in series.
CAUTION: DO NOT exceed the maximum current rating of the ASC-Plus of 15 amps. This
is the sum of the short circuit currents (Isc) of all the modules in parallel.
CAUTION: DO NOT reverse battery "PLUS" and "MINUS" connections to the ASCPlus. Reverse polarity or accidental contact to the battery in reverse polarity will
cause the fuse to be blown.
CAUTION: DO NOT connect the array directly to the battery when the array is
connected to the ASC-Plus at the same time. This will cause the ASC-Plus fuse to
blow when the battery voltage reaches the Charge Termination set-point.
CAUTION: DO NOT wire the ASC-Plus in such a way that it can be connected to an
alternator (or other charging source) while the battery is disconnected, even if
momentarily. Other charging sources should have independent connections to the
battery.
CAUTION: DO NOT exceed 8 inch pounds of torque on the terminal block screws during
installation. The screws are corrosion resistant nickel plated brass, and are softer than
standard steel screws.
INSTALLATION INSTRUCTIONS:
1. LOCATION: - The ASC-Plus may be mounted in almost any convenient location. The
unit should be mounted as close as possible to the batteries to avoid errors in battery
voltage reading. On units with temperature compensation (Option-A), the ASC-Plus
should be mounted within 10 feet of the batteries to enable the 10 foot sensor cable to
reach the battery. The ASC-Plus may be mounted on the rear of a module or other
surface using outdoor-type double-stick foam tape, or by using the mounting holes and
screws.
2. PROTECTION REQUIREMENTS: - The circuitry of the ASC-Plus is encased within
hard epoxy resin that offers substantial protection from the environment.
• HEAT: - The unit should not be mounted in direct sunlight or close to any heat
generating source to avoid extreme temperature increases. The rear of the unit
should not be blocked to allow air flow for adequate cooling.
• CORROSION: - The exposed terminal block is made of corrosion resistant nickel
plated brass. This will endure most outdoor environments. If the ASC-Plus will be
located in an excessively corrosive location, a coating of an oxide inhibitor should be
applied to the terminals.
• TEMPERATURE COMPENSATION CABLE (for units with Option-A): - The
temperature compensation cable and sensor need to be protected from damage
(cuts, impacts, rodents). If the wire or cable is damaged, the ASC-Plus will not
operate. (Refer to Options section: OPTION A - Temperature Compensation).
3. COMPLETE THE INSTALLATION OF ARRAY, BATTERIES AND LOAD: - Follow
the manufacturer's instructions for mounting and wiring the solar panel, batteries
and the load. Install with the correct series-parallel configuration to insure proper
system voltage and current
4. SELECT WIRE:
WIRE TYPE: - It is recommended that stranded wire rather than solid wire be
used whenever possible, because stranded wire does not fatigue and cause
loose connections over time as easily as solid wire does. Also, select a wire
that offers the appropriate insulation for the condition of the location. (Refer to
the U.S. National Electrical Code for additional information)
WIRE SIZE: - Wire should be sized of sufficient gauge to safely handle the rated
current of the system and to limit voltage drop. An alternative to using larger
wire is to use two wires for the runs and connections.
Approximate Wire Size: (for 10 foot total length: panels to batteries)
# Solar Panels (50 watt)
Minimum Wire Gauge
1
# 14
2
# 12
3-6
# 10 (stranded wire)
FIGURE 1 ASC-Plus CONTROLLER
ASC-Plus
SOLAR PANEL ARRAY
+
+
Temp.Sensor
(Optional)
BATTERY
+
LOAD
INSTALLATION INSTRUCTIONS
(continued) :
5. REMOVE POWER FROM BATTERY / PANELS: - Disconnect power from the
batteries and panels prior to running the wires to the controller.
6. RUN SYSTEM WIRING: - After disconnecting the power sources, run the wires from
the battery and solar panel to the location selected for the controller. The wires
should reach the location of the ASC-Plus and be secured with a little extra for strain
relief loops.
7. NOTE WIRE POLARITY: - Make sure to correctly mark the source and polarity of the
wires using colored wires or tags. Incorrect polarity may cause the ASC-Plus fuse to
blow.
8. ASC-Plus CONNECTION: - Wire the ASC-Plus according to Figure 1. The ASCPlus terminals accept up to 10 gauge bare wire. (When using 10 gauge wire, use
stranded wire and divide the end-wires into two equal sections and straddle the
terminal screw). If using crimp connections, be sure to crimp and solder.
9. INSTALL TEMPERATURE COMPENSATION (OPTION-A): - If included. Refer to
OPTIONS section.
10. COMPLETE LOAD CONNECTION: - Refer to Figure 1 to complete the load
connection for low-voltage load disconnect..
11. INSTALL FUSING IF NEEDED: - Add additional circuit protection if needed.
12. RECONNECT BATTERY AND ARRAY POWER:
sequence needs to be followed.
-
No specific reconnect
13. OPERATION: - Operation of the ASC-Plus is now fully automatic. If the battery
voltage is below the Full Charge Termination set-point (14.3 volts) and power is
available from the array, the ASC-Plus should start up in the charge mode.
Refer to OPERATION: RESETTING THE LVD CIRCUIT section for information on
how to activate the loads immediately after installation.
During operation, it is normal for the unit to feel warm (but not too hot to touch).
14. CHECK FOR VOLTAGE DROP (OPTIONAL): - Once the system is installed and
operational, a check on the connections is recommended. A poor connection will
result in a voltage loss that will cause the batteries to be under-charged and/or result
in excessive heat generated at the location of poor connection (wire connection or
terminal block). A poor connection to the battery will also distort the battery voltage
reading and cause the charging to stop too soon. To check the connections, a
voltage multi-meter is required and the ASC-Plus must be charging with maximum
expected charge current.
Battery Connection: - First, note the voltage at the battery terminals. Select the
positive and negative terminals that are used for the ASC-Plus connection. Then
note the voltage at the ASC-Plus terminals for “BATT (+)” and “BATT (-)”. Ideally,
the difference in voltage should be no more than ¼ volt.
Array Connection: - Next, note the voltage at the panel wires. Select the positive
and negative wires that are used for the ASC-Plus connection. Then note the
voltage at the ASC-Plus terminals for “ARRAY (+)” and “ARRAY (-)”. Ideally, the
difference should also be no more than ¼ volt.
If the voltage drop is more, suspect crimp connections that have not been soldered,
in-line fuses or fuse holders, or loose terminals. If no location of voltage drop is
found, consider using larger wires (or double up the wires) for your run.
MONITORING
“CHARGING” LIGHT: - The "CHARGING" light will be on when the battery is charging.
When the battery is at a low state of charge, the light will be on continuously. When the
battery charges up, the light will go out for a while (until the voltage drops a little) and
then will be on again. When the battery is close to full charge, the light will be on for short
periods of time, and off for longer periods.
The charging light will be on when there is voltage from the solar panel and the battery
can use more charging. This could result in the "CHARGING" light being on faintly when
the panels are in very low light conditions (i.e. night time with moonlight).
“LOAD DISCONNECTED” LIGHT: - Generally, this light indicates that the battery
voltage is low and the loads have been turned off. This light will turn on if the battery
voltage drops to 11.5 volts. At this point, system usage should be minimized and if
possible, an alternative method (alternator, generator, AC battery charger) should be
used to bring the battery voltage up. Once the voltage increases a small amount (by
charging or turning off large loads), the light will go off.
“BATTERY CONDITION” LIGHTS: - The colored battery lights are available to provide a
general condition of the battery.
VERY LOW: -
Voltage is very low. Reduce use of loads or use
additional source to charge the batteries. If
continues, see TROUBLE SHOOTING section.
OK: -
Battery voltage is low to moderate. Use of loads
should be conservative.
GOOD: -
Voltage is good.
CHARGING: -
Battery voltage is very good and is probably in the
charging mode.
OVERCHARGED:
Voltage very high. Stop additional charging. See
TROUBLE SHOOTING.
OPERATION
The operation of the ASC-Plus is completely automatic. No user interface is required
after installation. This controller will regulate the charging of batteries during conditions
of heavy usage, or when left unattended for long periods of time.
SWITCHING SHUNT, PULSE CHARGE REGULATION: - When in the charge mode,
the ASC-Plus allows maximum available array current to flow into the battery through
a blocking diode, lighting the "CHARGING" light. As the battery charges, the voltage
will rise slowly until it reaches about 14.3 volts. At this point, the "CHARGING" light
goes out and battery charging stops. When charging stops the battery voltage will
fall, and when the battery voltage drops to about 13.5 volts, the ASC-Plus will resume
charging.
A TYPICAL DAY: - A typical daily cycle will be as follows. As the charging starts for the
day and battery capacity is low, charging will be continuous. As the battery charges
up, current will pass into the battery for a while and eventually stop. Later, charging
will resume and the system will continue this cycle throughout the day. During the
course of the day, the duration of the charging period of each cycle will get shorter
(cycling on for shorter periods and staying off longer). When the battery is close to
full charge, it will pulse current into the battery to achieve and maintain full charge.
This pulse charging is indicated by the "CHARGING" light occasionally turning on
and off.
LOW-VOLTAGE DISCONNECT (LVD): - The ASC-Plus has a relay that can be used to
prevent deep-discharge damage to batteries. The relay acts as an automatic switch to
disconnect the load before the battery voltage gets too low. The loads are turned off at
the Load Disconnect set-point (11.5 volts) and the loads turn on again at the Load
Resumption set-point (13.0 volts). The “LOAD DISCONNECTED” light indicated that the
loads are disconnected.
RESETTING THE LVD CIRCUIT: - On initial installation, the ASC-Plus will start out with
the LVD relay energized (load disconnected mode). In a 12 volt system, the battery
voltage has to rise to the reset voltage of about 13.0 volts to clear this condition. If the
array is connected to the controller and is producing at least 17 volts open circuit, the
LVD can be reset by disconnecting and then reconnecting the battery positive. The reset
is indicated by the "LOAD DISCONNECTED" light being off.
BATTERY FUSE: - The battery fuse is rated at 15 amps, type: MIN. The fuse will blow
and protect the circuitry from excess current from the array, reverse polarity from the
battery or other wiring problems.
OPTIONS
Options cannot be added to units after production.
OPTION A - Temperature Compensation:
DESCRIPTION: On units equipped with Option-A, a small sensor on a ten foot cable is wired
into the controller to adjust the charging thresholds according to battery temperature. The
rate of compensation is -5mv/°C per battery cell in series from 25° C. See Table 1 below.
WHEN NEEDED: Temperature compensation is recommended for stand-alone systems with
sealed batteries, or for systems that have no regular charging source other than PV AND
where prolonged temperature extremes will be experienced during periods of charging.
Temperature extremes would be when the battery will be exposed to average temperatures
below 50°F (10°C) or above 90°F (32°C) for weeks at a time. Systems with other sources
of charging, (alternators on RVs) or applications where the battery is on maintenance
charge, normally do not need this option.
CAUTION: SENSOR CABLE: If the sensor is damaged or the cable is cut, the controller will
no longer function.
INSTALLATION: Provision must be made to attach the sensor unit to the battery. This must
be done properly to insure that accurate temperature readings are made. It is important
that ambient temperature do not influence the sensor. To minimize this, attach the sensor
to the battery as follows:
1. RUN SENSOR TO BATTERIES: Run the sensor to the batteries. Care should be taken to
prevent damage to the actual sensor itself. When pulling the sensor through conduit, do not
pull on the plastic-coated sensor, but instead on the gray cable just behind the sensor. Do
not force the sensor. The sensor itself is made of glass, but it is encased in an aluminum
tube, then coated with plastic. If the tube should pull off of the glass sensor, and if the
sensor is not damaged, the tube can be slipped back over the sensor.
2. ATTACH SENSOR: Use the “Temp. Comp Pad” (included) to cover the sensor (the plastic
coated unit at the end of the cable) to the side of the battery approximately half-way up the
side of the battery. Choose a battery that is shielded from drafts or sunlight by other
batteries or by the battery shelter. DO NOT immerse the sensor directly in the battery's
electrolyte, it will be severely damaged. Temperature compensation of charging voltage is
now automatic.
Table 1 : Voltage set-points by temperature.
Temperature compensation coefficient is: -.03 volts / °C from 25°°C (for 12 volt)
CONTROLLER
VOLTAGE
0 (32)
12 VOLT
15.05
10 (50)
14.75
TEMPERATURE °C (°°F)
20 (68) 25 (77) 30 (86)
14.45
14.30
14.15
40 (104) 50 (122)
13.85
13.55
”QUICK” TROUBLESHOOTING
IF THE CONTROLLER IS NEWLY INSTALLED, CHECK THESE THINGS FIRST:
1) Re-check system wiring to insure proper installation and polarity .
2) Check all system fuses and circuit breakers. Before replacing a blown fuse, locate
and correct the cause.
3) Check to see that modules and batteries are in the correct series-parallel
configuration for proper system voltage and current.
4) Review the controller specifications, operation and set-points, particularly the
charge termination and reconnect voltage set-points. Units with temperature
compensation (Option A) will have higher set-points in cold weather and lower setpoints in hot weather. If possible, check set-points while the controller is in
operation, monitoring the battery voltage with a multi-meter.
5) If the unit is equipped with temperature compensation (Option-A), inspect the
temperature sensor and sensor wire. Check for a broken sensor or a cut or frayed
sensor wire.
6) Review controller specifications, array output, load ratings and system sizing to
insure that ratings are not exceeded.
IF THE CONTROLLER HAS BEEN INSTALLED AND WAS PREVIOUSLY WORKING
PROPERLY, CHECK THESE THINGS FIRST:
7) Check all system fuses and circuit breakers. Before replacing a blown fuse, locate
and correct the cause.
8) Confirm that all connections are sound. In particular, check crimp connections that
have been crimped but not soldered as these connections tend to deteriorate over
time.
9) If you have an accurate volt meter, check for a voltage drop between the controller
and the battery when maximum charging is occurring. Drops often occur through
old fuses, fuse holders or circuit breaker boxes and at loose or corroded
connections.
10) High voltage from nearby lightning strikes or unregulated charging sources can
damage the controller, in spite of the built-in lightning protection.
11) If the unit is equipped with temperature compensation (Option-A), inspect the
temperature sensor and sensor wire. Check for a broken sensor or a cut or frayed
sensor wire.
12) Check output from the array, and that the array is not partially shaded or dirty.
TROUBLE
SHOOTING
The following section can assist in the troubleshooting of a solar system. Please review
the section below titled “HELP NOTES” which lists some common problems with a
solar system.
• ASC-Plus Charge Controller: - If a possible problem is suspected based on the
observations of the ASC-Plus controller, refer to the chart titled ASC-Plus
PROBLEMS CHART and the “Case Note” for each condition on the following
pages.
• Battery: - If you feel your batteries are not being adequately charged or are
consistently being over-charged, refer to the section BATTERY PROBLEMS.
• Solar Panels: - If you feel that the solar panels are not performing adequately,
refer to the section SOLAR PANEL PROBLEMS. You may be asked to perform
a test using a voltage multi-meter to assist with the diagnosis.
HELP NOTES:
(Normal Conditions and Common Problems)
NORMAL CONDITIONS:
1. NORMAL OPERATION: CHARGING / NOT CHARGING - Depending on your system, the
ASC-Plus may go for long periods of constant charging or long periods with no charging. The
ASC-Plus is designed to prevent over-charging of the battery. It does this by stopping the
charging at about 14.3 volts. It will then turn the solar panel off. Charging will resume when
the battery voltage drops to about 13.5 volts. If the battery is fully charged, additional charging
may not be needed. If the charge current is not strong enough to over-charge the battery, the
controller may not turn the panel charging off.
2. BATTERY WATER LOSS - Vented batteries will need some water from time to time in the
natural course of events. Minor water loss is not a problem, just top the level up when needed.
Excessive water loss (a quart or more in a period of a month) may indicate a more serious
problem.
3. BATTERY GASSING - In vented batteries, some gassing is good. Gassing stirs up the battery
acid and allows the battery to fully charge. A little bubbling in the batteries is not necessarily a
problem. See BATTERY WATER LOSS above.
4. TEMPERATURE - Temperature can affect the performance of batteries. They will tend to
over-charge easier when hot, and will not have as much capacity when cold. On units with
temperature compensation (Option-A), the charge set-point will be higher in cold weather and
lower in hot weather. The variation is about .5 volts for every 30° from 75° F. See OPTIONS
section, Table 1: VOLTAGE SET-POINTS BY TEMPERATURE.
HELP NOTES:
(continued)
PROBLEM CONDITIONS :
5. SYSTEM IS NOT SIZED CORRECTLY - The solar system batteries will tend to be undercharged if the solar panel array is too small, or if the battery bank is too small, or if the usage
is too high.
6. PROBLEMS WITH SOLAR PANELS - Solar panel output is dependent upon the amount of
sun-energy reaching the panel. This can be seriously affected by panel angle of orientation,
minor shading, high level haze (barely visible) and dust or dirt on the panel. At the time of
installation, a solar array can have an incorrect series-parallel configuration for the proper
system voltage and current. A panel can also become less productive or defective over time.
TEST: Disconnect the ARRAY(+) connection on the ASC-Plus, and measure the voltage at
the array using the positive and negative wires. In sunny conditions, this should be 18-24
volts. A lower value could indicate a problem with the solar panel array. To check array
current, contact a local solar dealer.
7. PROBLEMS WITH BATTERIES - At the time of installation, a battery bank can have an
incorrect series-parallel configuration for the proper system voltage and current. A battery can
also go bad and unable to maintain a charge. TEST: If the battery is going bad, a little
charging or discharging will cause a large change in the battery voltage.
8. BAD CONNECTION: PANEL - The panel connection to the controller may be weak or
completely out. This may include problems with the connections at the ASC-Plus (ARRAY
(+) and ARRAY (-) terminals), both panel connections (“+” or “-”) or fuses and unsoldered
crimp connectors in these lines. Also, wire that is too small for the length of the run may cause
a voltage drop. TEST: Refer to INSTALLATION INSTRUCTIONS, step #14: CHECK FOR
VOLTAGE DROP.
9. BAD CONNECTION: BATTERIES - The ASC-Plus needs to read an accurate battery voltage
to regulate the charging correctly. The battery connection to the controller may be weak or
completely out. Connection problems can be found with the connections at the ASC-Plus
(BATT (+) and BATT (-) terminals), the ASC-Plus fuse, both battery terminals (“+” or “-”) or
other fuses and unsoldered crimp connectors in these lines. Also, wire that is too small for the
length of the run may cause a voltage drop.
TEST: Refer to INSTALLATION
INSTRUCTIONS, step #14: CHECK FOR VOLTAGE DROP.
10. CONTROLLER MISWIRED - This may include reversing the polarity from the panels or
batteries, or switching the array and battery connections.
11. CONTROLLER DEFECTIVE - The ASC-Plus may no longer be functional. It could have been
exposed to high voltage (such as a lightning strike nearby), too much current from the panels,
reverse polarity from the batteries, or the temperature compensation cable could be damaged
(for units with Option-A). Refer to ASC-Plus FIELD TEST PROCEDURE
ASC-Plus PROBLEM CHART:
Refer to this chart and the ASC-Plus
PROBLEM DESCRIPTIONS (next page), to help diagnose potential problems based
on the observations of the ASC-Plus and actual battery voltage. The use of a voltage
multi-meter may be helpful.
-
Problems with charging
CASE BATTERY VOLTAGE
(use multi-meter at
battery terminals)
CHARGE
LIGHT
“LOAD
DISCONNECTED”
LIGHT
OTHER
ASC-Plus
CASE NOTES
(next page)
1→
Low voltage
(9.0 - 13.2 volts)
ON
Day time
See Case 1
(next page)
2 →
Low voltage
(9.0 - 13.2 volts)
OFF
Day time
See Case 2
3 →
Moderate voltage
(13.2 - 14.0 volts)
Turns OFF
(too soon)
Day time
See Case 3
4 →
High voltage
(14.4 - 15.0 volts)
ON
See Case 4
5 →
High voltage
(14.4 - 15.0 volts)
OFF
See Case 5
6 →
ON - at night
See Case 6
7 →
Light going on
and off rapidly
See Case 7
8 →
ASCPlus
buzzing
See Case 8
9 →
ASCPlus hot
See Case 9
“LOAD
DISCONNECTED”
LIGHT
OTHER
ASC-Plus
CASE NOTES
(next page)
Problems with low-voltage load disconnect
CASE BATTERY VOLTAGE
(use multi-meter at
battery terminals)
CHARGE
LIGHT
10 →
Very low voltage
(11.5 volts or lower)
OFF
Loads
stay on
See Case 10
11 →
Low to Moderate voltage
(11.5 - 14.3 volts)
ON
Loads off
See Case 11
ASC-Plus PROBLEM DESCRIPTIONS
(from the ASC-Plus PROBLEM CHART)
ASC-Plus Case 1 - A continuous low voltage condition with good charging during the day
would indicate that the controller is functional but a problem exists with one of the
following:
• A problem exists with the system sizing. See SYSTEM IS NOT SIZED CORRECTLY
(Help Note #5)
• A problem exists with the solar panels. See SOLAR PANEL PROBLEM SECTION
• A problem exists with the batteries. See BATTERY PROBLEM SECTION
ASC-Plus Case 2 - A low voltage condition with no charging during the day would indicate
one of the following:
• The system has no panel input. See BAD CONNECTION: PANEL (Help Note #8)
• The ASC-Plus may be defective. See CONTROLLER DEFECTIVE (Help Note #12)
ASC-Plus Case 3 - A moderate voltage condition where the charging appears to stop too
soon (below 14.1 volts) would indicate one of the following:
• The ASC-Plus may have a bad battery connection. Somewhere in the battery connection
there could be a voltage drop that would cause the controller to sense a higher
battery voltage than what actually exists. See BAD CONNECTION: BATTERY (Help
Note #9)
• Temperature Compensation (Option-A) can change the controller set-points. See
TEMPERATURE (Help Note #4)
• The ASC-Plus may be defective. See CONTROLLER DEFECTIVE (Help Note #12)
TEST: - Try to monitor the voltage at the ASC-Plus "BATT (+)” and "BATT (-)” terminals when
the controller actually stops charging (CHARGING light goes OFF). If the voltage at the
ASC-Plus terminals is about 14.3 volts then assume a voltage drop along the battery
connection is causing the problem.
ASC-Plus Case 4 - A high voltage condition with additional charging would indicate one of
the following:
• The battery voltage may be just under the charge termination set-point and not need to
shut off. See NORMAL OPERATION: CHARGING / NOT CHARGING (Help Note
#1)
• Temperature Compensation (Option-A) can change the controller set-points. See
TEMPERATURE (Help Note #4)
• The ASC-Plus may be defective. See CONTROLLER DEFECTIVE (Help Note #12)
ASC-Plus Case 5 - A high voltage condition (over 14.5 volts) with the solar charging
terminated during the day would indicate the controller is functional but the batteries are
being over-charged by a second charging source. Other charging sources should feature
their own charge regulation.
ASC-Plus Case 6 - The "CHARGING" light can be on very dimly at night if the panels are
under even very low levels of light (moonlight or street lights). The "CHARGING" light is
on brightly at night would indicate one of the following:
• The controller is miswired. See CONTROLLER MISWIRED (Help Note #10)
• There is a blocking diode located within the solar panels or in the panel connection. This
is not a serious problem, but should be removed if possible.
• The ASC-Plus may be defective. See CONTROLLER DEFECTIVE (Help Note #12)
TEST: Disconnect the panel (ARRAY (+)), if the light goes off, then it may be possible that
the panel is receiving enough light for a slight charge, or a diode exists in the
connection.
ASC-Plus Case 7 - The “CHARGING” light going on and off rapidly can indicate one of the
following:
• This could be a normal condition that results from a high charge rate, a full battery and a
load on.
• The battery could be bad (one that is unable to maintain a charge). See BATTERY
PROBLEM SECTION
• This could indicate a bad battery connection. - See BAD CONNECTION: BATTERY
(Help Note #9).
TEST: Take a voltage reading at the battery with an accurate meter. If the voltage reading
stays steady while the “CHARGING” light on the ASC-Plus continues to go on and
off, then suspect a bad battery connection. If the voltage here also moves up and
down rapidly, this may indicate the battery bank is bad or too small. This may also
indicate this normal condition: when the battery is fully charged, and the array can
provide a lot of charge current, the controller can pulse on and off rapidly, particularly
when there is current being used by a load. This is a normal operating condition and
is not a problem.
ASC-Plus Case 8 - The buzzing sound is caused by the controller switching on and off very
rapidly and is a problem relating to a bad battery connection. See BAD CONNECTION:
BATTERY (Help Note #9).
ASC-Plus Case 9 - The ASC-Plus may get warm during normal operation. If the unit should
get too hot to touch, consider it defective. See CONTROLLER DEFECTIVE (Help Note
#12)
ASC-Plus Case 10 - A low-voltage condition where the loads do not turn off would indicate
one of the following problems:
• The battery voltage may not have actually dipped down below the Load Disconnect setpoint (about 11.5 volts)
• A very low battery. The load-disconnect circuit stops working at about 8.0 volts.
ASC-Plus Case 11 - If the loads are turned off when the battery voltage is above the Load
Disconnect set-point consider one of the following:
• On initial installation, the ASC-Plus will start out with the relay energized (load disconnected
mode). The battery voltage has to rise to the reset voltage of about 13.0 volts to clear this
condition. If the array is connected to the controller and is producing at least 17 volts open
circuit, the loads can be turned on by disconnecting and then reconnecting the ASC-Plus
BATT (+) connection.
• The battery voltage may need to rise to the Load Reconnect set-point of about 13.0
volts.
• A poor connection to the load exists or some other load problem.
• A poor connection in the battery connection may exist that results in a voltage drop during
periods of load usage (larger drop for higher current) that disappears when loads are turned
off. This voltage drop results in the controller seeing a lower voltage than what the battery
voltage actually is. See BAD CONNECTION: BATTERY (Help Note #9)
BATTERY PROBLEMS: - Refer to this section to help diagnose potential problems
based on battery observations.
CASE BATTERY
SEE CASE NOTE(S)
1 →
Battery voltage low or does not hold a charge
See Battery Case 1
2 →
Battery seems to be over-charging
See Battery Case 2
Battery Case 1 - BATTERY UNDER-CHARGED: If the batteries are always low and not
able to be charged sufficiently, consider one of the following problems:
• System not sized correctly: - (See Help Note #5). For too much usage, try charging the
battery with another charging source (engine alternator, generator or AC battery
charger). If the batteries are OK and hold the charge, an increase in the number
batteries and panels may be needed to support the usage.
• Solar Panels Problem: - Panel may be dirty, not aligned or other problem. (See Help
Note #6)
• ASC-Plus Controller Problem: - A problem may exist with the charging input from the
controller. This would delete or reduce the daily re-charging of the battery. A problem
with the ASC-Plus would not cause the battery to be drained of voltage. See the ASCPlus PROBLEM section.
• A Problem with the Batteries: - The batteries could be configured incorrectly or be
going bad. (See Help Note #7)
• A Cold Battery: - Cold temperatures can affect the battery charging. See
TEMPERATURE (Help Note #4). If the battery is cold much of the time, the battery’s
long-term performance and life may suffer.
Battery Case 2 - BATTERY OVER-CHARGING: If there is evidence that the batteries have
been over-charging, consider these points:
• Normal Battery Condition: - The batteries may not be over-charging but only be
experiencing normal water loss and normal levels of gassing. (See Help Notes #2 and
#3)
• Controller Problem: - The ASC-Plus could be defective. If the charging light is on and
the actual battery voltage (measured at the battery) is over 14.5 volts, the controller
would appear to be defective.
• A Problem with the Batteries: - The batteries could be configured incorrectly. (See Help
Note #7)
• Non-compatible Batteries: - The batteries may be a type that are not compatible with
this system and require a lower full-charge voltage. Check battery specifications.
• Other Charging Sources: - Another charging source could be the cause. Some 110 volt
battery chargers are not well regulated and could over-charge batteries if left
unattended.
• A Hot Battery: - See TEMPERATURE (Help Note #4)
SOLAR PANEL PROBLEMS:
CASE PANELS
1 →
Less charge than expected
- Refer to this section to help diagnose potential
problems based on panel performance.
SEE CASE NOTE(S)
See Panel Case 1
Panel Case 1 - The panels should generate a charge current close to their max. power
current as presented in their specifications. To reach this level assumes that all conditions
are ideal. If the panel performance as measured at the panel inputs on the ASC-Plus
controller is much lower, consider the following potential problems.
• Solar Panel Problem: - Panels may be dirty, not aligned or other problem. Panel may
have shadows crossing it. The panels could be configured incorrectly or be defective.
See Problem with the Solar Panels (Help Note #6)
• Bad Panel Connection to the Controller: - See BAD CONNECTION: PANEL (Help
Note #8).
ASC-Plus -
FIELD TEST
PROCEDURE
The following is a field test procedure for the standard ASC-Plus charge controller. For
BENCH TESTING, substitute a properly current-limiting power supply for the array.
TEST 1: Alternate A ( Active solar array required )
This will test the basic operation of the ASC-Plus by testing the FET’s (not shorted or open).
Requirements: digital multi-meter (dmm)
active solar array, Voc at least 17 volts
1) Connect the array plus and minus wires to the appropriate terminals on the ASC-Plus
(no battery connection).
2) Measure voltage at BATT(+) and BATT(-) terminals on the ASC-Plus. The reading
should be between 14.0 and 15.0 volts. If this reading is very high, 16-20 volts,
or very low, 2-5 volts, the unit is defective.
TEST 1: Alternate B ( If no active solar array is available )
Tests for the most common failure condition: shorted FET’s. This problem would cause a “no
charging” condition.
Requirements: digital multi-meter (dmm)
1) Remove all connections from the ASC-Plus
2) Set multi-meter to the 200Ω resistance scale
3) Take measurements from ASC-Plus terminals. Contact positive lead of the meter to
ARRAY (+) and negative lead of meter to ARRAY (-). Reading should be open
(>200Ω). A short (<10Ω) indicates unit is defective.
TEST 2
This procedure tests the condition of the blocking diode.
Requirements: digital multi-meter (dmm)
1) Remove all connections from the ASC-Plus
2) Set multi-meter to the 2KΩ resistance scale
3) Take measurements from ASC-Plus terminals. Contact positive lead of the meter to
ARRAY (+) and negative lead of the meter to BATT (+). Reading should be less
than 2KΩ. Above 2KΩ would indicate a defective unit.
4) Reverse contacts (positive lead to BATT (+) and negative lead to ARRAY (+)).
Reading should be greater than 2KΩ. Below 2KΩ would indicate a defective unit.
LIMITED FIVE YEAR WARRANTY
SPECIALTY CONCEPTS, INC.
1. Specialty Concepts, Inc. warrants all its products for a period of five (5) years from the date of
shipment from its factory. This warranty is valid against defects in materials and workmanship for
the five (5) year warranty period. It is not valid against defects resulting from, but not limited to:
A. Misuse and/or abuse, neglect or accident.
B. Exceeding the unit's design limits.
C. Improper installation, including, but not limited to, improper environmental protection and
improper hook-up.
D. Acts of God, including lightning, floods, earthquakes, fire and high winds.
E. Damage in handling, including damage encountered during shipment.
2. This warranty shall be considered void if the warranted product is in anyway opened or altered. The
warranty will be void if any eyelets, rivets, or other fasteners used to seal the unit are removed or
altered, or if the unit's serial number is in any way removed, altered, replaced, defaced or rendered
illegible.
3. The five (5) year term of this warranty does not apply to equipment where another manufacturers'
warranty is available. An example of such equipment may be, but is not limited to, an electronic
enclosure. The time limit for this warranty may be for less than the Specialty Concepts limited
warranty. Specialty Concepts will assist the claimant in attempts to seek warranty claims for such
equipment, where appropriate.
4. Specialty Concepts cannot assume responsibility for any damages to any system components used
in conjunction with Specialty Concepts products nor for claims for personal injury or property
damage resulting from the use of Specialty Concepts' products or the improper operation thereof or
consequential damages arising from the products or use of the products.
5. Specialty Concepts cannot guaranty compatibility of its products with other components used in
conjunction with Specialty Concepts products, including, but not limited to, solar modules,
batteries, and system interconnects, and such loads as inverters, transmitters, and other loads
which produce "noise" or electromagnetic interference, in excess of the levels to which Specialty
Concepts products are compatible.
6. Warranty repair and/or evaluation will be provided only at Chatsworth, California facility of Specialty
Concepts. Units for such repair and/or evaluation must be returned freight prepaid to Specialty
Concepts with a written description of any apparent defects. Specialty Concepts will not be required
at any time to visit the installation site wherein Specialty Concepts' products are subject to warranty
repair and/or evaluation.
7. Only Specialty Concepts is authorized to repair any of its products, and they reserve the right to
repair or replace any unit returned for warranty repair. The party returning a unit for repair is
responsible for proper packaging and for shipping and insurance charges, as well as any other
charges encountered, in shipping to and from Specialty Concepts.
8. This warranty supersedes all other warranties and may only be modified by statement in writing,
signed by Specialty Concepts.
Warranty terms effective as of April 1, 1993
S PECIALTY C ONCEPTS I NC.
,
8954 MASON AVE., CHATSWORTH, CA 91311
USA
SPECIALTY CONCEPTS, INC.
REPAIR INFORMATION FORM
All Specialty Concepts, Inc. products carry a 5 year limited warranty.
ASC-Plus’s can not be repaired but will be replaced for all warranty failures.
Directions for returning units needing in warranty servicing.
1. Fill in this form completely
2. Box up unit with Repair Form and copy off sales receipt (if available).
3. Send by UPS or Certified Parcel Post to :
Specialty Concepts, Inc.
Attn: Repair Dept.
8954 Mason Ave.
Chatsworth, CA 91311 USA
============================================
Contact Person's Name
and Company : _________________________________________________
Return Address
: _________________________________________________
(UPS Deliverable,
Avoid PO Boxes) : _________________________________________________
Daytime Phone
: __________________________________________________
Product Model /
Serial Number
: __________________________________________________
Please attach a separate page describing the failure.
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