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ASC-Plus DESCRIPTION
The ASC-Plu</i>s is a rugged PV battery
charge controller with low-voltage
load disconnect and battery condition
monitoring that is completely sealed
against harsh environments. The
ASC-Plus is available for 12 volt
systems with charging current up to
16 amps, and minimizes damage to
expensive batteries due to over-
charging or deep discharge. The
ASC-Plus has a simple, low
component count design that uses
solid state components for charge
regulation, and relies on a rugged
relay to handle the unpredictable
spikes and surges often encountered
from loads. A battery fuse, lightning
protection and a blocking diode are
all included.
FEATURES
CHARGE REGULATION 16 amp charge current, 12 volt Switching shunt, pulse charging Remote temperature
compensation (option)
LOW VOLTAGE LOAD DISCONNECT 10 amp LVD Relay
DESIGN FEATURES Encapsulated for protection Simple, rugged circuitry 100% solid state charge control Over-current protection - battery
fuse Reverse leakage protection -
blocking diode Reverse polarity protection Lightning protection Input noise suppression Low power consumption
MONITORING Bar graph of battery voltage Charging light LVD activated light
MOUNTING Surface mount Suitable for outdoor mounting
OPERATION
SWITCHING SHUNT REGULATION -
The ASC-Plus will allow maximum
array current to flow into the battery
through a blocking diode, lighting
the "CHARGING" light (LED), until
the battery voltage reaches the
charge termination set-point. At this
point, a shunt transistor will turn on,
shorting out the solar array, turning
off the "CHARGING" LED and
halting any further battery charging.
When the battery voltage drops to
the charge resumption set-point, the
shunt transistor will turn off and
charging will resume. The result is
that when battery capacity is low,
charging will be continuous. As the
battery charges up, current will pass
into the battery for shorter and
shorter periods, until at full charge,
it will pulse current into the battery
to achieve and maintain full charge.
LOW-VOLTAGE DISCONNECT -
The ASC-Plus can protect the
battery from low-voltage damage by
disconnecting loads when the
battery voltage drops. The unit uses
a relay to disconnect loads at 11.5 +
.2 volts, and automatically
reconnects at 13.0 + .3 volts.
OPTION DESCRIPTIONS
A - Temperature Compensation :
Temperature compensation is
generally recommended for sealed
batteries or where batteries are
expected to experience temperature
variations of more than + 10° from
25°C during periods of charging. A
small temperature sensor on a 10
foot lead monitors battery
temperature and adjusts the
charging thresholds according to
battery temperature. The rate of
compensation is -5mv/°C per
battery cell from 25°C.
ASC-Plus
Block diagram - ASC-Plus
ASC-Plus
S
PECIALTY
C
ONCEPTS,
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NC.
PHOTOVOLTAIC CHARGE CONTROLLER ASC-P
lus
PART NUMBERING KEY
Model
EXAMPLE:
Option
ASC-Plus - A
MODEL

OPTIONS
ASC-Plus
A - Temperature Compensation
Specifications and product availability subject to change without notice.
DIMENSIONS
In Inches (cm)
PARAMETERS
UNITS
VALUE
Nominal Voltage
(Volts)
12
Short Circuit Current, Continuous
(Amps)
16
Short Circuit Current, Max (60 seconds)
(Amps)
20
Load Current, Continuous (2)
(Amps)
10
Load Current, Max (60 seconds) (2)(4)
(Amps)
13
Array Voltage, Max Voc
(Volts)
26
Operating Voltage @ Battery, Minimum
Charge Control
(Volts)
0
Load Disconnect
(Volts)
8.5
Quiescent Current
(Milliamps)
15
Current Consumption, Charging, Typ.
(Milliamps)
20
Current Consumption,
Load Disconnected, Typ. (3)
(Milliamps)
40

Voltage Drop, Array to Battery, Typ.
(Volts)
.40
Voltage Drop, Battery to Load, Typ.
(Volts) @ 10 amps
.06
Charge Termination
(Volts)
14.3 + .2
Charge Resumption
(Volts)
13.5 + .3
Load Disconnect (LVD)
(Volts)
11.5 + .2
Load Reconnect
(Volts)
13.0 + .3
Operating Temp. Range
(
°
C)
0 to 50
Storage Temp. Range
(
°
C)
-55 to 85
Temperature Comp. Coef. (from 25
°
C) (1)
(Volts/
°
C)
-.03
Notes: (1) Temperature compensation option
(2) Non-inductive.
(3) LVD relay energized, red L.E.D. on, typical value.
(4) Carry only, Non-switching
2/97
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PECIALTY
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ONCEPTS
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8954 MASON AVE., CHATSWORTH, CA 91311 USA PH: (818) 998-5238, FAX: (818) 998-5253