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2.5 Electrical Performance
2.5.1 Invert
Topology
The Sigineer Power pure sine wave inverter/charger is built according to the following topology.
Invert: Full Bridge Topology.
Charge: Isolated Boost Topology
When operating in invert 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, and directed into the transformer which steps the 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 high efficiency MOSFETs and the heavy transformers, it outputs PURE SINE WAVE AC with
an average THD of 7% (min 3%, max 10% under full linear loads) depending on the load connected and
battery voltage.
The peak invert efficiency of Sigineer Power is 90%.
Overload Capacity
The Sigineer Power inverter/charger has different overload capacities, making it ideal to handle demanding
loads.
1 For 110%<Load<125%(±10%), no audible alarm in 14 minutes, beeps 0.5s every 1s in the 15th minute,
and Fault(Turn off) after the 15th minute.
2 For 125%<Load<150%(±10%), beeps 0.5s every 1s and Fault(Turn off) after the 1 minute.
3 For 300%≧Load>150%(±10%), beeps 0.5s every 1s and Fault(Turn off) after 20s.
Soft Start in Inverter Mode
The inverter is engineered with a “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 deliver 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 an initial higher power surge to start. Hence, if
multiple loads are being powered, they should be switched on one by one so that the inverter is not
overloaded by the higher starting surge if all the loads are switched on at once.
2.5.2 AC Charger
The Sigineer Power pure sine wave inverter/charger 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 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, Sigineer
Power pure sine wave inverter/charger is able to output max charge current as long as input AC voltage is in
the range of 164-253VAC for 240Vac models (95-127VAC for 120V models), and AC frequency is in the
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