Power Star W7 Pure Sine Wave Inverter/Charger User’s Manual www.sigineer.com
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without frequent switches to the battery bank.
In order to make the inverter accept dirty power from a generator, when the SW2 is switched to position “1”,
the inverter will bypass an AC input with a higher voltage(164-264Vac for 230Vac models, 90-135Vac for
120Vac models) and wider frequency (40Hz plus for 50Hz/60Hz). Accordingly, the AC charger will also
work in a higher voltage(174-254Vac for 230Vac models, 100-135Vac for 120Vac models) wider frequency
range (43Hz plus for 50Hz/60Hz).
This will avoid frequent switches between battery and generator. But some sensitive loads will suffer from
the low quality power.
The pros and cons should be clearly realized before you do the setting.
Power Saver & Unit Off Charging:
Under the Battery Priority Mode (SW5 in position “1”), the inverter can be switched between two modes:
Power Saver Mode (SW3 in position “1”) and Unit Off Charging Mode (SW3 in position “0”). The power
Switch should be in “Power saver on” position all the time for using these functions.
In Power Saver Mode, the inverter is initially in standby mode and sends a pulse to detect the presence of a
load every 3 seconds. Each pulse lasts for 250ms. The inverter will remain in standby mode until a load has
been detected. Then it will wake up from standby mode and start to invert electricity from the battery bank
to supply the load. As this function is under Battery Priority, the inverter will always prefer to invert
electricity from battery first even there is a qualified AC input present. Only when the battery voltage is
lower than the low voltage alarm point, will the inverter switch to AC input power to charge the battery and
supply the load at the same time.
This Power Saver Mode can be changed to Unit Off Charging mode via SW3 by switching it to “0” position.
(SW5 still in “1”).
“Unit Off Charging” will enable the inverter charger to charge batteries as much as possible while without
discharging them.
In “Unit Off Charging” mode, the inverter will stay in standby mode without sensing loads. It won’t output
any power even if a load is turned on, and only stay idle in this mode when there is no AC input.
When a qualified AC input is present, it will start charging the battery and transfer power to loads.
This feature is ideally suitable for applications where energy conservation for batteries is required.
Charging will be activated once qualified AC exists, while discharging is disabled.
The inverter only consumes as little as 3 watts in “Unit Off Charging” mode.
Output Frequency:
The output frequency of the inverter can be set at either 50Hz or 60Hz by SW4 which make the inverter
charger an international models for most electricity systems.
AC/Battery Priority:
The inverter chargers are designed with AC/Battery priority switch (DIP switch #5).
Position “0” for AC priority mode, Position”1” for battery priority mode.
In AC Priority Mode, when AC input is present, the battery will be charged and the inverter will transfer the
input AC to power the load. Only when the AC input is stable for a continuous period of 15 days will the
inverter start a battery inverting/discharging cycle to protect the battery. After one normal charging cycle
AC through put will be restored. For more info, please refer to our manual at AC Charging Section.
When set in battery priority, the inverter will invert from battery despite the AC input. Only when the
battery voltage reaches the low voltage alarm point will the inverter transfer to AC Input, charge battery, and
switch back to battery when the battery is fully charged. This function is mainly for wind/solar systems
using utility power as back up.
The AC/Battery Priority function can be activated by sliding the switch even when the inverter is in
operation.
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