170 Cherry Avenue
West Sayville, NY 11796
www.kussmaul.com
Ph: 800-346-0857
Fax: 631-567-5826
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C.Soft Start in Inverter Mode
The inverter is engineered with “Soft Start” feature.
When the inverter is turned on, the output voltage gradually ramps up from 0VAC to rated voltage
in about 1.2 sec. This effectively reduces otherwise very high starting inrush current drawn by AC
loads such as Switched Mode Power Supplies and inductive loads. This will result in lower motor
inrush current, which means less impact on the loads and inverter.
.
Caution:
After the inverter is switched on, it takes a finite time for it to self diagnose and get ready to deliv
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er full power. Hence, always switch on the load(s) after a few seconds of switching on the inverter.
Avoid switching on the inverter with the load already switched on. This may prematurely trigger the
overload protection. When a load is switched on, it may require initial higher power surge to start.
Hence, if multiple loads are being powered, they should be switched on one by one so that the in-
verter is not overloaded by the higher starting surge if all the loads are switched on at once.
II. Charger
:
The Auto Power Inverter Charger is equipped with an active PFC (Power Factor Corrected) mul-
tistage battery charger. The PFC feature is used to control the amount of power used to charge
the batteries in order to obtain a power factor as close as possible to 1.
Unlike other inverters whose max charging current decreases according to the input AC voltage,
Auto Power Inverter Charger is able to output max charge current as long as input AC voltage is
in the range of 95-127VAC for 120V model, and AC freq is in the range of 48-54Hz(58-64Hz for
60Hz model).
The Auto Power Inverter Charger has a very rapid charge current available, and the max charge
current can be adjusted from 0%-100% via a liner switch on the DC side of the inverter. This will
be helpful if this powerful charger apply charging on a small capacity battery bank.
Choosing “0” in the battery type selector will disable charging function.
There are three main charging stages:
Bulk Charging:
This is the initial stage of charging. While Bulk Charging, the charger supplies
the battery with controlled constant current. The charger will remain in Bulk charge until the Ab-
sorption charge voltage (determined by the Battery Type selection) is achieved.
Software timer will measure the time from charger start until the battery charger reaches 0.3V
below the boost voltage, then take this time as T0 and T0×10 = T1.
Absorb Charging:
This is the second charging stage and begins after the absorb voltage has
been reached. Absorb Charging provides the batteries with a constant voltage and reduces the
DC charging current in order to maintain the absorb voltage setting.
In this period, the inverter will start a T1 timer; the charger will keep the boost voltage in Boost CV
mode until the T1 timer has run out. Then drop the voltage down to the float voltage. The timer
has a fix time of 1 hour.
Float Charging:
The third charging stage occurs at the end of the Absorb Charging time. While
Float charging, the charge voltage is reduced to the float charge voltage (determined by the Bat
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tery Type selection*). In this stage, the batteries are kept fully charged and ready if needed by the
inverter.
