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Frequently Asked Questions

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    What is an inverter?

An inverter takes DC power (battery or solar, for example) and converts it into AC "household" power for running electronic equipment and appliances.

    How is an inverter different than a UPS?

A UPS typically includes the battery and battery charger in one stand alone unit. However, there are UPSs that use external batteries, and PowerStream makes inverters with battery chargers, so the differences blurr as features proliferate.

UPSs also can have communication with the equipment that it is powering letting the equipment know that it is operating on standby, giving it shutdown warning, or communicating with the human in the loop. Inverters typically don't have this communication.

     Why are they called inverters?

Originally converters were large rotating electromechanical devices. Essentially they combined a synchronous ac motor with a commutator so that the commutator reversed its connections to the ac line exactly twice per cycle. The results is AC-in DC-out. If you invert the connections to a converter you put dc in and get ac out. Hence an inverter is an inverted converter.

    What is the difference between sine wave and modified sine wave?

Alternating current (AC) has a continuously varying voltage that swings from positive to negative. This has great advantages in power transmission over long distances. Power from your power company is carefully regulated to be a perfect sine wave, because that is what naturally comes out of a generator, and also because sine waves radiate the least amount of radio power during long distance transmission.

On the other hand, a sine wave is expensive to make in an inverter, and many sine wave techniques use heavy, inefficient transformers. The most inexpensive way to make AC is to switch the DC on and off--a square wave. A modified sine wave is scientifically designed to simulate a sine wave in the most important respects so that it will work for most appliances. It consists of a flat plateau of postive voltage, dropping abruptly to zero for a while, then dropping again to a flat plateau of negative voltage, back to zero for a while, then returning to the positive voltage. This pause at zero volts puts more power into the 60HZ fundamental than a simple square wave does, so it is called "modified sine wave" instead of "square wave."

 

Contact Address

N.R. Jana B.E.,
3/172, Kamarajar Street,
East Coast Road,
Neelangarai, Chennai-41

Mobile: 9 884 664 555
E-Mail: jana@sindhuelectronics.com

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