Power Star W7 Pure Sine Wave Inverter/Charger User’s Manual www.sigineer.com
8
The de-sulphation charging should not be carried out on batteries with good conditions.
Charging depleted batteries
The PSW7 Series pure sine wave inverter/charger allows start up and through power with depleted batteries.
For 12VDC models, after the battery voltage goes below 10V, if the switch is still(and always) kept in "ON"
position, the inverter is always connected with battery whose voltage doesn’t drop below 2V, the inverter
will be able to charge the battery once qualified AC inputs.
Before the battery voltage going below 9VDC, the charging can activated when the switch is turned to “Off”,
then to “ON”.
When the voltage goes below 9VDC, and the power switch is turned to “OFF” or disconnect the inverter
from battery, the inverter will not be able to charge the battery once again, because the CPU lose memory
during this process.
Charging current for each model
The charging capacity will go to peak in around 3 seconds; this may probably cause a generator to drop
frequency, making inverter transfer to battery mode.
It is suggested to gradually put charging load on the generator by switching the charging switch from min to
max, together with the 15s switch delay, our inverter gives the generator enough time to spin up.
Please use a small jeweler’s style flat-head screwdriver to turn the charge current
control switch gently to avoid breakage due to over-turning.
To guarantee the best performance of AC charger when the AC input is from a
generator, the standby generator should be of at least 150% higher capacity than the
inverter.
Warning! Operation with an under-rated generator or generator with unqualified
wave form may cause premature failure which is not under warranty.
2.5.3 Transfer
While in the Standby Mode, the AC input is continually monitored. Whenever AC power falls below the
VAC Trip voltage (154 VAC, default setting), the inverter automatically transfers back to the Invert Mode
with minimum interruption to your appliances - as long as the inverter is turned on. The transfer from
Standby mode to Inverter mode occurs in approximately 10 milliseconds. And it is the same time from
Inverter mode to Standby mode.
Though it is not designed as a computer UPS system, this transfer time is usually fast enough to hold them
up.
There is a 15-second delay from the time the inverter senses that continuously qualified AC is present at the
input terminals to when the transfer is made. This delay is built in to provide time for a generator to spin-up
to a stable voltage and avoid relay chattering. The inverter will not transfer to generator until it has locked
onto the generator’s output. This delay is also designed to avoid frequent switch when input utility is
unstable.
2.5.4 Remote Operation
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