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SLAC-MH Solar street light controller
User Manual
Thank you very much for choosing our product. This product manual
provides important information and advices for product installation, use
and troubleshooting. Before using this product, please read carefully and
thoroughly.
SLAC-MH is specially designed for small home solar systems with low
cost and high performance. It has a number of outstanding features:
The controller adjusts itself automatically to 12V or 24V system voltage.
Sophisticated programmable nightlight function.
Clear readable LED display of the state of charge.
4 stage charging(Main,boost, equalization, float) for flooded battery, 3
stage charging(Main,boost, float) for sealed battery.
Enclosed by aluminum shell and potted by epoxy with high thermal
conductivity. Protection grade reaches IP68.
Safety recommendations
Recommend a wire diameter: SLAC -MH5A/10A: 1.5 mm
²
; SLAC -
MH15A: 2.5 mm
²
,ensure the battery and the controller between the
cable length as short as possible, to prevent controller misjudge battery
voltage.
Connect the controller by following steps to avoid installation faults.
1. Connect the wire to the controller, then to the battery.
2. Connect the wire to the controller, then to the photovoltaic modules.
3. Connect the wire to the load, then to the controller.
（
3
）
（
1
）
（
2
）
Starting up the controller:
Self Test
As soon as the controller is supplied with power either from the battery or
the solar array, it starts a self test routine. Then the display changes to
normal operation.
System Voltage
The controller adjusts itself automatically to 12V or 24 V system
voltages. As soon as the voltage at the time of start-up exceeds 20.0V,
the controller assumes a 24V system. If the battery voltage is not
within the normal operation range at start-up, a status display according
to the section ERROR DESCRIPTION occurs.
LED Status and Display
SLAC-MH Controller has five LEDs. One green LED is for charge
display, three yellow LEDs are for the state of charge display, and one
red LED is for the status of load display.
Normal operation Description
LED
Status
Function
Green
LED
On
Main charge during daytime
Slow flash
Float charge
Fast flash
Equalization charge
Off
Controller connected to battery, night
detected.
Yellow
Yellow LED 1(L) on
Battery power low
LED
Yellow LED 2(M) on
Battery power medium
Yellow LED 3(H) on
Battery power high
Red
LED
Off
Normal operation
Flash
Overload or Short-circuit of load
Error Description
Loads are not
supplied.
Indication
Cause
Corrective action
Battery is low
（
Red LED on
）
Load will reconnect as
soon as battery is
recharged
Over current /
Short circuit of
loads
（
Red LED
flashing
）
Switch off all loads.
Remove short circuit.
Controller will switch on
load automatically after
max 1 minute.
Battery voltage
too high
(>15.5 / 31.0 V)
Check if other sources
overcharge the battery. If
not, controller is damaged
Battery wires or
battery fuse
damaged, battery
has high
resistance
Check battery wires, fuses
and battery. Remove
faults.
Battery is low
after short
time.
Battery has low
capacity
（
Red
LED on
）
Replace the battery.
Battery is not
being charged
during
daytime.
Solar array faulty
or wrong polarity
（
Green LED
off
）
Check solar array and
wiring. Remove faults.
Safety Features
PV terminals
Battery terminals
Load
terminals
Reverse
polarity
24V system: no
12V system: yes
Protected
Protected
Short circuit
Protected
Protected (with fuse
on battery) (3)
Protected
Over current
Protected
Protected
Switches off
with
a delay (3)
Reverse
charge
Protected
No effect
No effect
Over voltage
Max. 55V
Max. 55V
Switches off
with a
delay
Under voltage
No effect
No effect
Switches off
above
15.5/31.0 V
Over
temperature
When over temperature occurs, the controller will
reduce the charging current. If the temperature of
controller reaches a high level, the load will
automatically be switched off.
(1) Controller can protect itself, but load might be damaged.
(2) We strongly recommend that add a fuse between battery and controller.
The battery may be permanent damaged when short circuit occurs.
(3) > 200% rated current: Load will be switched off with 3s delay.
Warning: Two or more error conditions at the same time may cause
damage to the controller. Always remove the present fault condition
before next operation
