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Thread: Difference between Inverter and UPS

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    Default Difference between Inverter and UPS

    I have seen many companies which sell UPS and Inverter
    What is the exact difference b/w a UPS and an inverter

    I know both of them convert DC to AC but what is the exact difference

    I was going through the SU-KAM website and they sell both UPS and invertor, not sure what is the difference

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    The basic difference in layman's terms is:

    While both provide backup power during mains outage, with the UPS the switch is instantaneous whereas with the Inverter there is a gap of a second or two. This gap is OK for household gadgets such as lights, fans, fridge, etc. but not OK for computers.

    In technical terms:

    UPS: The mains power comes to the UPS. The AC is converted to DC and this DC is constantly charging the battery. The output of the battery is fed to the Sine wave inverter and it converts DC to AC and this feeds the equipment. Since power out is always drawn from the battery, there is no time lag when mains swicthes off; it justs stops the battery from being charged and the UPS continues to supply power till the battery runs out.

    Inverter: The mains power comes to the Inverter. This is directly sent to the output but the AC is also converted to DC and this DC is constantly charging the battery. A sensor and relay mechanism checks whether the mains is ON or OFF. When the main switches OFF, the relay actuator triggers to switch from mains to inverter. Rest is same like the UPS. Because of this sensor and relay, there is a gap between triggering.

    UPS involves more costly circuitary and is therefor more expensive to make and sell.
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    Thanks a lot
    you have made it crystal clear

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    Thanks for the valuable info

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    cheers to just4kix!!!

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    Quote Originally Posted by just4kix View Post
    The basic difference in layman's terms is:

    While both provide backup power during mains outage, with the UPS the switch is instantaneous whereas with the Inverter there is a gap of a second or two. This gap is OK for household gadgets such as lights, fans, fridge, etc. but not OK for computers.

    In technical terms:

    UPS: The mains power comes to the UPS. The AC is converted to DC and this DC is constantly charging the battery. The output of the battery is fed to the Sine wave inverter and it converts DC to AC and this feeds the equipment. Since power out is always drawn from the battery, there is no time lag when mains swicthes off; it justs stops the battery from being charged and the UPS continues to supply power till the battery runs out.

    Inverter: The mains power comes to the Inverter. This is directly sent to the output but the AC is also converted to DC and this DC is constantly charging the battery. A sensor and relay mechanism checks whether the mains is ON or OFF. When the main switches OFF, the relay actuator triggers to switch from mains to inverter. Rest is same like the UPS. Because of this sensor and relay, there is a gap between triggering.

    UPS involves more costly circuitary and is therefor more expensive to make and sell.

    Just to add to this valuable info UPS provides the pure sine wave AC but this is not in the case of Inverter so there are chances that Inverter might damage the complex electronic circuitry of computer.

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    Quote Originally Posted by aktmnr View Post
    Just to add to this valuable info UPS provides the pure sine wave AC but this is not in the case of Inverter so there are chances that Inverter might damage the complex electronic circuitry of computer.
    Actually there are inverters from SU KAM which come with pure sine wave, so no problems with that

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    Quote Originally Posted by gardencityboy View Post
    Actually there are inverters from SU KAM which come with pure sine wave, so no problems with that
    Yep and thats why they even claim in their Ads that you can use it to run computers...

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    Quote Originally Posted by gardencityboy View Post
    Actually there are inverters from SU KAM which come with pure sine wave, so no problems with that

    these inverters are called online UPS and they are very costly comparing to normal sinewave inverters

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    Quote Originally Posted by aktmnr View Post
    Yep and thats why they even claim in their Ads that you can use it to run computers...
    ... as long as there is no delay in switchover.

    Quote Originally Posted by player View Post

    these inverters are called online UPS and they are very costly comparing to normal sinewave inverters
    You know what ... now the major cost in a UPS or Invertor is not the device itself but the batteries. It appears that batteries have become extremely expensive. From what I heard, now batteries' cost is almost 70% is an invertor that gives 1 KVA backup for 4 hours.

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