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ratedrsuperstar
The Sexy Beast
APC UPS's are very good no noice at all plus they give abt 15-17min of backup
i think it's for abt 1900 or 2000 but definitely the best i've seen
i think it's for abt 1900 or 2000 but definitely the best i've seen
nileshgr
Wise Old Owl
Man I am using Powersafe!! Though we don't have much electricity problem here as this area is an industrial area and the electricity board ppl do every work very fast even at the middle of the night! But i will tell you that i really gives. I am using CRT monitor. But if you have LCD, then it may give more backup time coz LCD wattage is 40W-75W. CRT is 100+Wapacheman said:
pranavrules2007
I Sell Brains,Any Buyers?
The first question to ask when choosing a UPS system should be: is this unit going to be placed inside a controlled environment? If the answer to this question is yes, choose an indoor UPS. If the answer is no, choose an outdoor UPS. It doesn’t matter that you choose the right topology, power, backup time, etc. If you place an outdoor UPS in a controlled environment, you might be wasting money (exceptions to this could be found when powering small loads during an extended period of time, where outdoor UPS systems are sometimes the only available option). If you place an indoor UPS in a non-controlled environment, the useful life of this system will be considerably shortened, threatening the integrity and backup of the equipment you are protecting with the UPS.
Besides choosing a UPS design, there are 2 key ratings to be aware of when choosing a UPS unit. The first is the load rating, expressed as both volt amps (VA) and watts (W). Both the ratings represent the maximum amount of load that the UPS can support and the connected load typically should not exceed 80% of either. Special considerations must be made when connecting certain equipment such as printers or any type of motorized load.
The second factor in deciding which unit to purchase is the amount of runtime the unit will be able to provide when the power fails. This number will vary with the load amount that is plugged into the UPS. For example, a unit may run a single computer for 30 minutes, but with 2 computers it will generally last less than half that time. Larger units typically can provide more runtime for the same load than smaller units, however that is not always the case. Some UPS units are designed to provide extended runtime or have the ability to have external battery packs connected.
Another consideration is the anticipated usage. If the UPS is only intended to provide enough power to gracefully shut down the computers, serial or USB ports on the UPS and support software are essential. If the purpose of the UPS is to provide power until a standby generator kicks in (typically under a minute), the UPS input capabilities should be matched to the generator outputs. Specifically, most standby generators made for home use (15 kW or less) and most portable generators lack microprocessor voltage-and-frequency control and may not create a smooth sine wave. This can result in voltage and frequency fluctuating by 5% or more. While most UPS systems handle voltage fluctuations gracefully, most do not handle frequency fluctuations well. A UPS with a wide "frequency window" is essential in such cases. However, this can double the cost of the unit. Only a double conversion UPS can deliver a stable output frequency when powered by an unstable input frequency.
If the UPS needs to be quiet when running from battery, or will power AC motors (as found in air conditioners and fans) or other equipment requiring a clean sine wave (such as high-end computer power supplies), a UPS that outputs a smooth sine wave is needed. For some other uses, a block or quasi-sine wave waveform[5] is acceptable. UPS systems with square wave, or "simulated", "approximated" or "stepped" sine wave output do not give smooth sine waves. In fact, their output voltage contains a lot of harmonic distortion. This is why this type of output exists only in small power ratings standby UPS, where electrical noise and excess heat in wiring is generally not an issue.
Another consideration should be based on the type of load or connected equipment the UPS will support. If the UPS is connected to "mission critical" equipment or sensitive electronics (like lasers), a rotary solution will be more suitable with 100% line to load isolation. This would not only protect the equipment from a power outage, but will also protect the connected equipment from any anomaly that comes from the utility feed.
Features to look for:
1. Output frequency regulation within 0.5% (prevents connected equipment from over heating)
2. Electromagnetic interference (EMI) AC noise suppression (noise filtering).
3. Reasonable cost for replacement batteries.
4. If energy efficiency is important avoid "Standby On-Line Hybrid", "Standby-Ferro", and "Double Conversion On-Line" UPS systems.
5. If the UPS outputs a sine wave, a high quality unit will feature a voltage regulating transformer.
6. If the UPS outputs a square wave, a high quality unit will use Pulse-width modulation (PWM)
Besides choosing a UPS design, there are 2 key ratings to be aware of when choosing a UPS unit. The first is the load rating, expressed as both volt amps (VA) and watts (W). Both the ratings represent the maximum amount of load that the UPS can support and the connected load typically should not exceed 80% of either. Special considerations must be made when connecting certain equipment such as printers or any type of motorized load.
The second factor in deciding which unit to purchase is the amount of runtime the unit will be able to provide when the power fails. This number will vary with the load amount that is plugged into the UPS. For example, a unit may run a single computer for 30 minutes, but with 2 computers it will generally last less than half that time. Larger units typically can provide more runtime for the same load than smaller units, however that is not always the case. Some UPS units are designed to provide extended runtime or have the ability to have external battery packs connected.
Another consideration is the anticipated usage. If the UPS is only intended to provide enough power to gracefully shut down the computers, serial or USB ports on the UPS and support software are essential. If the purpose of the UPS is to provide power until a standby generator kicks in (typically under a minute), the UPS input capabilities should be matched to the generator outputs. Specifically, most standby generators made for home use (15 kW or less) and most portable generators lack microprocessor voltage-and-frequency control and may not create a smooth sine wave. This can result in voltage and frequency fluctuating by 5% or more. While most UPS systems handle voltage fluctuations gracefully, most do not handle frequency fluctuations well. A UPS with a wide "frequency window" is essential in such cases. However, this can double the cost of the unit. Only a double conversion UPS can deliver a stable output frequency when powered by an unstable input frequency.
If the UPS needs to be quiet when running from battery, or will power AC motors (as found in air conditioners and fans) or other equipment requiring a clean sine wave (such as high-end computer power supplies), a UPS that outputs a smooth sine wave is needed. For some other uses, a block or quasi-sine wave waveform[5] is acceptable. UPS systems with square wave, or "simulated", "approximated" or "stepped" sine wave output do not give smooth sine waves. In fact, their output voltage contains a lot of harmonic distortion. This is why this type of output exists only in small power ratings standby UPS, where electrical noise and excess heat in wiring is generally not an issue.
Another consideration should be based on the type of load or connected equipment the UPS will support. If the UPS is connected to "mission critical" equipment or sensitive electronics (like lasers), a rotary solution will be more suitable with 100% line to load isolation. This would not only protect the equipment from a power outage, but will also protect the connected equipment from any anomaly that comes from the utility feed.
Features to look for:
1. Output frequency regulation within 0.5% (prevents connected equipment from over heating)
2. Electromagnetic interference (EMI) AC noise suppression (noise filtering).
3. Reasonable cost for replacement batteries.
4. If energy efficiency is important avoid "Standby On-Line Hybrid", "Standby-Ferro", and "Double Conversion On-Line" UPS systems.
5. If the UPS outputs a sine wave, a high quality unit will feature a voltage regulating transformer.
6. If the UPS outputs a square wave, a high quality unit will use Pulse-width modulation (PWM)
abhishek_del
Journeyman
I am using PowerJen UPS - ultra battery
It is large though it provides backup over 1 hour if monitor is off or in TFT....With monitor and speakers also it provides decent backup...and it is I think 1000 VA and it will cost you for I think 3.5k to 4k...
I have been using it for over 1.5 years and its working perfectly, also has a battery indicator (how much left)
It is large though it provides backup over 1 hour if monitor is off or in TFT....With monitor and speakers also it provides decent backup...and it is I think 1000 VA and it will cost you for I think 3.5k to 4k...
I have been using it for over 1.5 years and its working perfectly, also has a battery indicator (how much left)
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