Product Manual

6
2-4.
F
eatures
High overload ability up to 300% of rated power (20 sec
Low quiescent current, low power “Power Saving Mode” to conserve energy
Automatic Generator Start
4-step intelligent battery charger, PFC (Power Factor Correction for charger
8 pre-set battery type selector switch plus de-sulphation for completely flat batteries
Powerful charge rate of up to 115Amp, selectable from 0% 100% (based on model)
10 ms typical transfer time between battery and AC, guarantees power continuity
LCD or LED remote controls (optional
15s delay before transfer when AC resumes, extra protection for loads when used with generator
Allows start up and throughput power with depleted batteries 30A/40A (bypass current)
Multiple controlled cooling fans
Extensive protections against various harsh situations
13VDC battery recovery point, dedicated for renewable energy systems
2‐5. Electrical Performance
2.5.1 Inverter
Topology
The Global LF inverter/charger is built according to the following topology.
Invert: Full Bridge Topology.
Charge: Isolated Boost Topology.
It works bi-directionally: in one direction it converts DC power from the battery to AC power (Inverter
Mode) and in the other direction it converts external AC power to DC power to charge the batteries (AC
Mode). The same power components are used in both directions, resulting in high-energy transfer efficiency
with fewer components.
When operating in inverter mode, the direct current (DC) that enters the inverter from the batteries is filtered
by a large input capacitor and switched "On" and "Off" by the Metal Oxide Silicon Field Effect Transistors
(MOSFET) at a rate of 50 Hz or 60Hz, in this step the DC is converted to low voltage synthesized sine wave
AC using an H-bridge configuration and high frequency PWM (Pulse Width Modulation) technique. It is
then directed into the transformer which steps the low AC voltage up to 230 or 120 volts.
The unit has a 16bit, 4.9MHZ microprocessor to control the output voltage and frequency as the DC input
voltage and/or output load varies.
Because of the high efficiency MOSFETs and the heavy transformers, it outputsPURESINEWAVEAC
with an average THD of 10% (min 3%, max 20% under full linear loads) depending on load connected
and battery voltage. The peak DC to AC conversion efficiency of the Global LF series is >88%.
Don’t parallel the AC output of the inverters to increase power capacity as they have no
stacking functionality.