Product Manual

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Charging depleted batteries
The Global LF series inverter allows start up and through power with depleted batteries.
For 12VDC models: after the battery voltage goes below 10V and the power switch is kept in the "ON"
position and the inverter stays connected to the battery and the battery voltage doesn’t drop below 9V, the
inverter will be able to charge the battery once qualified AC inputs are present.
Before the battery voltage goes below 9VDC, the charging can be activated when the switch is turned to
“Off”, then to “ON”.
When the voltage goes below 9VDC, and you accidently turn the switch to OFF or disconnect the inverter
from the battery, the inverter will not be able to charge the battery once again, because the CPU loses
memory during this process.
For 24VDC models: multiply all VDC by 2.
For 48VDC models: multiply all VDC by 4.
Charging current for each model
Model
Current
PICOGLF4024120UL
45+/-5A
PICOGLF4024240SUL
55+/-5A
PICOGLF6024120UL
60+/-5A
PICOGLF6024240SUL
80+/-5A
PICOGLF4024120ULC
45+/-5A
PICOGLF4024240SULC
55+/-5A
PICOGLF6024120ULC
60+/-5A
PICOGLF6024240SULC
80+/-5A
The charging capacity will go to peak charge rate in about 3 seconds. This may cause a generator to drop
frequency, making the inverter transfer to battery mode.
It is suggested to gradually put the 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. This
will depend on the size of the generator and rate of charge.
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 for 230VAC,90VAC for 120VAC), the inverter automatically
transfers back to the Inverter 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 keep your
equipment powered 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 switching when input utility is
unstable.