Product Manual

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Don’t parallel the AC output of the inverters to increase power capacity as they do not have
stacking functionality.
2.5.2 AC Charger
The Global LF Series is equipped with an active PFC (Power Factor Corrected) multistage battery charger.
The PFC feature is used to control the amount of power used to charge the batteries and to obtain a power
factor as close as possible to 1.
Unlike other inverters that have a max charging current decreases according to the input AC voltage, the
Global LF series charger is able to output max current as long as the input AC voltage is in the range of
164-243VAC (95-127VAC for 120V model), and AC frequency is in the range of 48-54Hz (58-64Hz for
60Hz model).
The Global LF series inverter has a very rapid charge current, and the max charge current can be adjusted
from 0%-100% via a liner switch to the right of the battery type selector. This will be helpful if you are
using our powerful charger on a small capacity battery bank. Fortunately, the liner switch can effectively
reduce the max charging current to 20% of its peak.
Choosing “0” in the battery type selector will disable the charging function.
Caution:
Turn the charge current control switch gently to avoid breakage due to over-turning.
To reduce the risk of fire, only connect to an AC circuit that can provide 150 percent of the inverter’s size.
There are 3 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 Absorption charge voltage
(determined by the Battery Type selection) is achieved.
A software timer will measure the time from A/C 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 minimum
time of 1 hour and a maximum time of 12 hours.
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 Battery Type
selection*). In this stage, the batteries are kept fully charged and ready if needed by the inverter.
If the A/C is reconnected or the battery voltage drops below 12Vdc/24Vdc, the charger will restart the above
cycle.
If the charge maintains the float state for 10 days, the charger will deliberately reset the cycle to protect the
battery.