User Manual

PST-SSB2180/2280 Solid State Battery Isolator/Protector
User Manual
INTRODUCTION AND INTENDED APPLICATIONS
This series of full solid state battery isolators use a micro-processor and FETs to control the On & Off
connection between the two voltage sensitive terminal posts according to preset voltage of each terminal.
It has two functions by selections:
A. As an isolator, it allows charging of the auxiliary battery only when the main battery is fully recharged.
B. As a battery protector (by shorting the blue wire to ground), a different threshold voltage to prevent over
discharge of battery by the load.
There is no moving part in the unit which can stand harsh operating condition from -40 to 50°C.
The MCU constantly scans the voltage level of each of the two terminals for appropriate & timely On or Off
connection according to its selected function (A or B).
Hysteresis & time delay programming in the microprocessor prevent or decrease rapid repeated on-off cycles
due to large difference in battery capacities & battery state of charge or high initial draw of load current such as
motor load. This type of oscillation or chattering as in solenoid switch is quite common in battery isolator.
There is a handy manual over-ride circuit for external switch to connect two terminals in case two batteries are
required to be connected in parallel for emergency purpose.
The voltage drop and idle current consumption is much less than the diode type of battery isolator.
The unit has over voltage and short circuit protection by disconnection.
PRECAUTIONS
Proper and correct connections and safety features must be followed according to local applicable regulations.
Use suitable sized cables and connectors and keep the cable connections as short as possible.
Use reliable terminals and torque the bolts tightly.
INSTALLATION AS BATTERY ISOLATOR.
1. Remove all other connections to the positive battery terminal.
2. Mount the PST-SSB2180/2280 battery isolator as close as possible to the alternator, on a ventilated location.
3. Connect the black wire to the chassis (ground) of the car.
4. Connect terminal A to the positive post of the main (starting) battery.
5. Connect terminal B to the positive post of the auxiliary (second / house) battery.
6. Double check tightness of all the bolts and blue wire and yellow wire are isolated.
INSTALLATION AS BATTERY PROTECTOR
Warning : Black wire to ground first to prevent damage to unit .
1. Connect the black wire to ground .
2. Then connect the blue wire to ground for protector mode.
3. Connect terminal A to positive post of battery.
4. Connect terminal B to load.
5. Double check tightness of all terminal bolts and yellow wire is isolated
TO UNINSTALL THE BATTERY ISOLATOR /PROTECTOR
Warning ! *REMOVE ALL CONNECTIONS TO TERMINAL A AND B FIRST BEFORE BLUE AND BLACK WIRES.