# Uninterrupted Power Supply (UPS)

• smuscat
In summary, the user has replaced the faulty battery in their UPS and measured the output voltage with a multimeter. Without load, the output is 184V and with load it ranges from 196V to 206V. They are concerned about potential damage to their computer and want to know the permissible output voltage of the UPS. The nominal AC line voltage varies between countries, with most European countries using 230V and the US and Canada using 120V. Australia converted to 230V as the standard in 2000. Japan uses 100V for household power, with a frequency of 50Hz in some regions and 60Hz in others. It is important to check the required input voltage range for the PC as stated

#### smuscat

Hi, I have an ups used for my PC. I have just replaced his faulty battery and checked the output on battery operation with a multimeter.The reading are as follows:
2. With load the output is between 196V to206V.
Can someone tell me if I use the ups anyway, might the computer be damged or not?
And last, what is the permissable output voltage given by the ups ?

smuscat said:
Hi, I have an ups used for my PC. I have just replaced his faulty battery and checked the output on battery operation with a multimeter.The reading are as follows:
2. With load the output is between 196V to206V.
Can someone tell me if I use the ups anyway, might the computer be damged or not?
And last, what is the permissable output voltage given by the ups ?

What is the nominal AC line voltage normally? From wikipedia:

http://en.wikipedia.org/wiki/Mains_electricity
wikipedia.org said:
Standardization

Following voltage harmonization, electricity supplies within the European Union are now nominally 230 V ± 10% at 50 Hz [1]. For a transition period (1995–2008), countries that had previously used 220 V changed to a narrower asymmetric tolerance range of 230 V +6% −10% and those (like the UK) that had previously used 240 V changed to 230 V +10% −6%[2]. Note that no change in voltage is required by either system as both 220 V and 240 V fall within the lower 230 V tolerance bands (230 V ±6%). In practice, this allows countries to continue to supply the same voltage (220 or 240 V), at least until existing generating plants are replaced. Equipment used in these countries is designed to accept any voltage within the specified range.

In the United States[3] and Canada[4], national standards specify that the nominal voltage at the source should be 120 V and allow a range of 114 to 126 V (-5% to +5%). Historically 110, 115 and 117 volts have been used at different times and places in North America. Main power is sometimes spoken of as 110; however, 120 is the nominal voltage.

In 2000, Australia converted to 230 V as the nominal standard with a tolerance of +10% -6%.[5], this superseding the old 240 V standard, AS2926-1987.[6] As in the UK, 240 V is within the allowable limits and "240 volt" is a synonym for mains in Australian and British English.

In Japan, the electrical power supply to households is at 100 V. Eastern and northern parts of Honshū (including Tokyo) and Hokkaidō have a frequency of 50 Hz, whereas western Honshū (including Nagoya, Osaka, and Hiroshima), Shikoku, Kyūshū and Okinawa operate at 60 Hz. The boundary between the two regions contains four back-to-back HVDC substations which convert the frequency; these are Shin Shinano, Sakuma Dam, Minami-Fukumitsu, and the Higashi-Shimuzu Frequency Converter. To accommodate the difference, frequency-sensitive appliances marketed in Japan can often be switched between the two frequencies.

And what does your PC's manual say for its required input voltage range?

## 1. What is Uninterrupted Power Supply (UPS)?

Uninterrupted Power Supply (UPS) is a device that provides emergency power to a load when the input power source fails. It is designed to protect sensitive electrical equipment from power surges, fluctuations, and outages.

## 2. How does a UPS work?

A UPS typically consists of a battery, a rectifier, an inverter, and a static switch. When the input power is available, the battery charges and the rectifier converts the AC power to DC power to power the load. When there is a power outage, the inverter converts the DC power from the battery into AC power to continue powering the load. The static switch ensures a seamless transition between the two power sources.

## 3. What types of UPS are available?

There are three main types of UPS: standby, line-interactive, and online. A standby UPS switches to battery power when there is a power outage. A line-interactive UPS regulates the voltage to protect against sags and surges. An online UPS continuously powers the load from the battery, providing the highest level of protection.

## 4. How long can a UPS provide power?

The amount of time a UPS can provide power depends on the size of the battery and the power consumption of the load. Generally, a UPS can provide power for a few minutes to several hours. It is important to properly size a UPS based on the specific needs of the equipment it is protecting.

## 5. Can a UPS be used for any type of equipment?

A UPS is suitable for any sensitive electronic equipment, such as computers, servers, networking equipment, and medical equipment. It is recommended to use a UPS for any equipment that could be damaged by a power outage or surge.