Solar charge controller Smart-DC series User Manual
6.LVD, LVR, Threshold, Dimming
6.1 Low Voltage Disconnect (LVD)
When the battery voltage drops below the LVD voltage,
the controller will disconnect the load to prevent deep
discharge of the battery. If this occurs, the battery should
be well charged before resuming use.
Gel, Liquid and AGM Battery: 12V: 10.8~11.8V
24V: 21.6~23.6V
Lithium Battery: 12V: 15. V
12/24V:
6.2 Low Voltage Reconnect (LVR)
If the low voltage disconnect is triggered, the controller
will restore load connection only when the battery
voltage increases above the LVR voltage.
Gel, Liquid and AGM Battery: 12V:
24V:
Lithium Battery: 12V:
12/24V:
8.0~ 0
8.0~30.0V
11.4~12.8V
22.4~25.6V.
8.6~15.0V
8.6~31.0V.
For SMR1006-DCN5XLiG/ SMR1012-DCN5LiG and
SMR2012-DCN5LiG, the LVD and LVR setting range are as
follow:
Battery low voltage protection (LVD) : 9.4v ~ 30.0V.
Controller low voltage recovery (LVR) : 10.0v ~ 31.0v.
!
voltage of "CVT"(Charging voltage target).
2. If the controller is set to "Dim" or "Auto Dim", the
minimum output current can be as low as 50mA.
1.Dimming voltage should not be greater than the
7.LED indications and Faults & Alarms
7.2Faults & Alarms
Fault
Status
Reason Remedy
Over
voltage
protection
Battery
can’t be
charged
Overcurrent,
short circuit
protection
Battery capacity
is low
Loads are
over current
or short circuit
High battery
voltage>
15.5/31.0V *
PV panel fault
or reverse
connection
Load will be reconnected
when battery is recharged
Switch off all loads,
remove short circuit,
load will be reconnected
after 1 minute automatically
Green
LED
is on
Low volt.
protection
Over temp.
protection
Controller temp.
is too high
Load reconnects
after temp. reduces
High
voltage
at
battery
terminal
Loads
are
not
powered
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,
fuse and battery.
All LED
fast
flashing
Can’t
recognize
system
voltage
Battery voltage
is not in right
range
Charge or discharge,
make battery voltage
in the right range
Check panels and
connection wires
7.1LED Display Explanation
LED
Status
Function
On
On
On
Fast flash(0.1/0.1s)
Flash(0.5/0.5s)
Work normal
The output power is 0.
Open circuit or
transport mode. *1
Off
Off
Flash(0.5/2s)
Slow flash(0.5/2s)
Super slow flash
(0.2s on/5s off )
Fast flash(0.1/0.1s)
Charging
Not charging
Green
LED
Over temperature
protection
Over
current protection
Short circuit or
Over voltage protection
Battery is normal
Yellow
LED
Red
LED
Low voltage protection
Battery voltage is low
Send parameters
successfully
3 LEDs are on 3s and off
for 1s at the same time.
*1.If the controller is in transport mode, the red LED is super
slow flash(0.2s on/5s off), the green and yellow led is off.
*2.Detailed fault information can be read by S/SG-Unit
remote controller.
Float charging
Flash(0.5s/0.5s)
Slow flash(0.5s/2s)
Equal or Boost charging
6.3 Day/Night Threshold, Day/Night Delay
The controller recognizes day and night based on the solar
array open circuit voltage. This day/night threshold can be
modified according to local light conditions and the solar
array used.
Day/Night threshold setting range:
Lithium: 3.0~8.0V/3.0~20.0V;
Gel, AGM and Liquid: 3.0~8.0/6.0~16.0V.
In the evening, when the solar array open circuit voltage
reaches the setting day/night threshold, you can adjust the
day/night delay time to make the load turn on a little later.
Dusk
Sunrise
Sunset
Dawn
3.0~20.0V
4.0~21.0V
!
1. Day/Night threshold voltage of load disconnect is
1/2V higher than the setting data, means the load will
disconnect when the solar voltage at
4~9/8~18V(Gel/Liquid/AGM) / 4.0~21.0V(Lithium).
2.The controller has an automatic day/night threshold
adjustment function. If the lowest voltage of solar array is
higher than the setting day/night threshold, the load has
no output in first night, 24 hours later the controller can
automatically adjust the day/night threshold to meet the
6.4 Auto Dimming
The "Dim Auto" of S/SG-Unit is set to "Yes",
V" and "Dim %" at the same time, press the "Send" key to
set up the controller. when the battery voltage is lower
than the voltage of "Dim V" , it starts to dimming
item set "Dim
Low
voltage
protection
Battery is
empty
after a
short time
Battery has low
capacity
Change battery
* Lithium: Battery voltage > CVT+0.2V
Gel, Liquid and AGM: Battery voltage>15.5/31.0V
Green
Red
Yellow
Page 3 of 7 pages
automatically. Battery voltage reduces per 0.1V, load
current decreased according to the set of "Dim %", the
minimum output current is 10% of the setting current.
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