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INVERTER RELATED
Preventing paralleling of the AC output
The AC output of this inverter cannot be synchronised with another AC source and hence, it
is not suitable for paralleling. The AC output of the inverter should never be connected
directly to an electrical breaker panel / load center which is also fed from the utility power /
generator. Such a connection may result in parallel operation of the different power sources
and AC power from the utility / generator will be fed back into the inverter which will
instantly damage the output section of the inverter and may also pose a fire and safety
hazard. If an electrical breaker panel / load center is fed from an inverter and this panel is also
required to be powered from additional alternate AC sources, the AC power from all the AC
sources like the utility / generator / inverter should first be fed to a manual selector switch
and the output of the selector switch should be connected to the electrical breaker panel /
load center.
To prevent possibility of paralleling and severe damage to the inverter, never use a simple
jumper cable with a male plug on both ends to connect the AC output of the inverter to a
handy wall receptacle in the home / RV.
Connecting to multi-wire branch circuits
Do not directly connect the hot side of the inverter to the two hot legs of the 120 / 240 VAC
electrical breaker panel / load centre where multi-wire ( common neutral ) branch circuit
wiring method is used for distribution of AC power. This may lead to overloading / overheat-
ing of the neutral conductor and is a risk of fire.
A split phase transformer ( isolated or auto-transformer ) of suitable wattage rating ( 25 %
more than the wattage rating of the inverter ) with primary of 120 VAC and secondary of
120 / 240 VAC ( Two 120 VAC split phases 180 degrees apart) should be used. The hot and
neutral of the 120 VAC output of the inverter should be fed to the primary of this trans-
former and the 2 hot outputs ( 120 VAC split phases ) and the neutral from the secondary of
this transformer should be connected to the electrical breaker panel / load centre.
Preventing input over voltage
It is to be ensured that the input voltage of the inverter does not exceed 16.5 VDC (PST-
15S-12A) or 33 VDC (PST-15S-24A) to prevent permanent damage to the inverter. Please
observe the following precautions:
- Ensure that the maximum charging voltage of the battery charger / alternator / solar charge
controller is below 16.5 VDC (PST-15S-12A) or 33 VDC (PST-15S-24A)
- Do not use unregulated solar panels to charge a battery. Under cold ambient temperatures,
the output of the solar panel may exceed 18 VDC for 12V battery system of 36VDC for
24V battery system. Always use a charge controller between the solar panel and the
battery.
- Do not connect the inverter to a battery that has a voltage higher than the rated battery
input voltage of the inverter.
Preventing reverse polarity on the input side
When making battery connection on the input side, make sure that the polarity of battery
connection is correct (Ensure that the centre contact of the cigarette lighter receptacle is
connected to the positive of the battery. The centre pin (tip) of the cigarette lighter plug
attached to the inverter is positive). If the input is connected in reverse polarity, DC fuse
inside the inverter will blow and may also cause permanent damage to the inverter.
