Battery Protector
(Low Voltage Disconnect)
SSB-4112 (12V-100A) and SSB-4212 (24V-100A)
User Manual
REV.1 2016/08
7673-4112-0561
1. Introduction
Over-discharging batteries can damage batteries and or load, and require a
longer recharge time. A Low Voltage Disconnect prevents this happening
so it is in effect a battery protector. Manson’s SSB-4112 / 4212 battery
protector is all solid state (FET) with micro-processor control (MCU). There
are no metal contacts like most voltage sensitive relay in the market.
The MCU continuously monitors the battery voltage and load current,
disconnects the load when battery voltage is below the preset voltage level
(LVD) or when load current is above the rated value of the unit. When the
battery is recharged, the voltage is raised to another preset voltage level
(LVR) the load is then automatically reconnected again.
The FET design limits the voltage drop to less than 0.25V even at 100A
load current. It has an extremely low standby (6mA) and operation (9mA)
current consumption. It also protects the load from over voltage (from
charging source to the battery) by disconnecting the load.
2. Intended Applications
To protect starting, house or site batteries and equipment for caravan, SUV,
boat, with DC loads such as DC motors, inverter, communication
equipment, fridge, and etc. against damage, and over discharging.
When battery is connected to a charging source such as solar, wind,
battery charger, it can conserve the battery power by allowing the load to
draw power from the charging dc source when the battery is full according
to your presets of LVR and LVD.
2.1 Questions and Answers
What are the applications?
Automatically separate and reconnect between one battery or DC source to
a load or another battery bank according to the selected voltage levels of
the main battery.
Typical examples: DC source such as main battery with alternator, solar
and etc., battery load system with fridge, ham radio, high power car audio,
winches, spot lights as in 4 wheel vehicles, RV and etc.
How does it work?
There is a microprocessor that constantly checks on the main battery
voltage level and compares with the selected voltage levels for separation
and connection.
It will automatically make separation or connection once the selected
voltage level is reached.
Can it be used to charge auxiliary battery?
And with what precaution?
Yes, it can be used to charge the auxiliary battery from the main battery.
It does not stop or prevent the back flow of current from auxiliary battery to
the main battery is lower than auxiliary battery.
3. Explanation of panel
.
.
.
.
.
.
.
Black wire to Ground or Negative of battery
Yellow wire when connected to + Positive of battery, Main & Aux. terminal is
connected.
Isolate this yellow wire when not in use.
Main Terminal for battery + positive connection.
Low Voltage Disconnect (LVD) Selector.
Dual color LED indicator:
A. No light =  Main and  Aux is disconnected.
B. Green light =  Main and  Aux is connected.
C. Red solid light = Over Voltage Protection for Main terminal (battery side),
and  and  is disconnected as a result.
D. Slow flashing Red light = Over temperature protection, unit overheat  &
 disconnect
E. Fast flashing Red light = Over Current Protection (>120Amp),  & 
disconnect.
Low Voltage Reconnect (LVR) Selector.
Auxiliary Terminal for + positive pole of load.
4. Installation notes:
1.
2.
3.
4.
5.
6.
7.
8.
9.
Negative Ground convention is used, that is the chassis of vehicles
connected to the negative terminal of the starting battery.
Whenever possible, use the shortest connection to the unit and
batteries.
The voltage drop of large current will affect the accuracy of isolator if
cable size and length are not correctly selected.
Please refer to the following link...
http://www.zetatalk.com/energy/tengy10s.pdf
Always double check the tightness of all connections by wigging the
connected terminals and etc. Connectors and fasteners are prone to
vibration loosening in a moving vehicle.
Loosen connections cause sparks.
Make sure the yellow wire  is isolated and insulated if not in use.
Use a toggle switch to connect this yellow wire to the positive terminal
of the battery for manual connection of the Main and Aux. terminals.
For unit to function properly, the LVR is always higher than the LVD
by at least 0.3V.
However the selections depends on the type of load, an the availability
and power of charging source, and battery capacity.
Switch off any charging source to the battery and the load. Connect
the Main to battery +positive and Aux to load + positive.
It is advisable not to a LVD less than (11.9V for 12V battery or 23.8V
for 24V battery) and a LVR less than (13.5V for 12V battery or 27V for
24V battery) in normal application.
Switch on the load, if battery is in good condition and selection of LVD
is less than the battery voltage, the LED should turn green. Otherwise
recharge the battery or change the selection of LVD.
If the LED turns red at any time, check on the LED INDICATIONS
SECTION in the specification page. There is no connection between
 load and battery  at fault mode.
Once the fault has been cleared, the unit will return to normal
operation.
5. Typical Wiring Diagram
6. Features
1.
2.
3.
4.
5.
10 Selections of Disconnect Voltage
10 Selections of Re-connect Voltage
MCU control with FET design resulting extremely low voltage drop & small
standby current.
Wide Operating Temperature Range: - 40°C to + 60°C
Extruded Aluminum housing sealed with Polycarbonate end caps
7. Protections
1.
2.
3.
4.
5.
Instant disconnection when main terminal drops to 8.5V for 12V battery or 17V
for 24V battery.
Over voltage protection at the main terminal.
Over temperature to the isolator >85°C case temperature
Over current to the unit.
Input reversed polarity protection to Main Terminal (self reset)
8. Specifications
Models
Battery Voltage System
Protector Setting
10 Disconnect Voltage
Selections and 10 Connect
Voltage Selections.
LVD = Cut Out = Disconnect.
LVR = Cut In = Connect
ON / OFF Delay Time For
Protector Mode
Protection
Low Voltage Protection
(No Delay)
Over Voltage Protection
Over Temperature Protection
Protection Current
(Start Point)
Continuous Output Current
Maximum Output Current
(Delay 60~10 seconds)
Operation Current
Consumption (LED ON)
Idle Current Consumption
(LED OFF)
Voltage Drop With 100A
(Main Batt. To Aux. Batt.)
Operation Temperature
Range
Manual Over-ride
Indication By LED
Approval
Dimension (L x W x H)
Weight
SSB-4112
SSB-4212
12VDC
24VDC
Tolerance: ±0.1Vdc for 12Vdc Tolerance: ±0.2Vdc for 24Vdc
sys.
sys.
LVD
LVD
LVR (Connect)
LVR(Connect)
(Disconnect)
(Disconnect)
10.5V
12.9V
21.0V
25.8V
10.9V
13.0V
21.8V
26.0V
11.2V
13.1V
22.4V
26.2V
11.5V
13.2V
23.0V
26.4V
11.9V
13.3V
23.8V
26.6V
12.1V
13.4V
24.2V
26.8V
12.4V
13.5V
24.8V
27.0V
12.6V
13.6V
25.2V
27.2V
12.8V
13.7V
25.6V
27.4V
13.0V
13.8V
26.0V
27.6V
15 Seconds
8.5VDC ±0.5VDC
17VDC ±1.0VDC
18.5VDC ±0.5VDC
34.5VDC ±1.0VDC
Yes
140A
100A
120A
9mA
6mA
250mV (Max.)
-40°C to +60°C
Yellow cable (2) to Battery Positive triggers Main & Aux
connection
LED GREEN = Connect
LED No Light = Disconnect
LED RED Protection:
1) Solid RED = Over Voltage (OVP).
2) Slow Flash RED = Over Temperature (OTP).
3) Fast Flash RED = Over Current (OCP).
CE EN 61000
162x75x50mm (6.3x3.0x2.0 inch)
486g (17oz)
◘ All values are based on the Standard ambient Temperature 25°C and Pressure 0.1Mpa.
◘ SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT PRIOR NOTICE
9. Dimension Diagram