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Frequently Asked Question: |
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What does an offline UPS do?
An off-line UPS remains idle until a power failure occurs, and then switches from utility power to its own power source, almost instantaneously.
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How do I identify the capacity of UPS for me?
Make sure in case of power failure how many tube lights, fans , TV , music system , computers etc you require. Add the power add the power ratings of all fans, lights, tv , computers etc. in watts and multiply the total by 1.4 to get inters of VA.
Typically, a UPS has a VA rating. The VA rating is the maximum number of Volts * Amps it can deliver. The VA rating is not the same as the power drain (in Watts) of the equipment. (This would be true if the load were only resistive or the circuit were DC, not AC). Computers are notoriously non-resistive. A typical PF (power factor: Watts/VA) for some computers may be as low as 0.6, which means that if you record a drain of 100 Watts, you need a power source with a VA rating of 167. Some literature suggests that 0.7 may be a good conversion factor, but this will depend heavily on the specific equipment. Moreover, there's really no way to determine these numbers besides measuring them.
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I want a UPS for my house and it should support both computer and Lighting. Which is better offline or online ?
Now a days offline UPS systems are available which can support both lighting and computers simultaneously . Hence you don’t have to purchase two separate ups one for lighting and one for computer. By buying only one you are saving lot of money. Normally, for domestic lighting and computer application an offline UPS will definitely serve the purpose. The cost of Online UPS systems are 3 to 4 times higher than the offline UPS system.
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What size UPS is suitable for a typical desktop system?
A typical Pentium or Apple system with a 15” monitor generally measures between 200-500VA (VA=Volts x Amps).
As extra peripherals such as amplified multimedia speakers, external modems, scanners, and other equipment are added, this load can sometimes be between 400VA or 800VA. 17” monitors can also increase the load by an additional 50-80VA.
Therefore, while a 400VA UPS is sufficient for a basic system configuration, a more practical entry-level choice is a 500VA UPS. It is common practise to leave some room for expansion; and if in doubt, always go to the next size. Our UPS Sizing Calculator can assist in finding the right size UPS for your equipment.
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What is the difference between Standby, Line-Interactive and True On-Line UPS?
"Standby" UPS models are designed for standard computer equipment applications where battery support is the most important factor.
In standby units, electricity typically passes through the UPS until an electrical disturbance is detected. Once a power failure or other electrical disturbance is detected, internal switches immediately transfer the output load to the unit's internal batteries. Standby UPS provide a quasi-sine wave output which is suitable for most switch-mode power supplies.
"Line Interactive" UPS models carry all the features of Standby UPS with many additional enhancements, including an enhanced level of surge and sag protection. Other features include provide a quasi-sine wave output and a unique microprocessor-controlled Intelligent Buck and Boost technology, which allows the unit to correct brownouts and overvoltage conditions without resorting to battery power reserves. This allows the unit to deal with a wider range of power disturbances and helps increase battery life. A line Interactive UPS is ideal for high-end desktop and small to medium level network servers. The unit's True Sine Wave Output is especially suited to communications equipment and other network peripherals.
"True On-Line UPS" provide the highest possible level of UPS power protection. Internally different from Standby and Line Interactive UPS models, a True On-Line UPS continually breaks down, conditions and rebuilds the input power supply to strict voltage and frequency regulations.
Some features offer full Double Conversion and Input/Output Isolation suitable for high-end network servers and mission-critical electronic equipment. True On-Line Double Conversion UPS models are fully compatible with generator power and the only UPS suitable for industrial locations and country areas with poor quality power.
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