What is the difference between online ups and offline ups?
Off line UPS passes the AC Mains Supply directly to the output load if the AC Mains Supply is present.Only in the case of power failure, it switches to inverter within few miliseconds to give power to load until mains supply returns.On the other hand On Line UPS always charges battery from incoming AC mains supply and supplies power to load via the inverter.Even if the mains supply fails, there is no interruption to the output load at all. Generally On Line UPS unlike off line UPS are expensive and inefficient as Inverter is continuously in operation. However it provides greater quality of power as compared to offline UPS.
Power Supplies: What is an online ups system? How does it work?
To understand this term, it's useful to know the different types of UPS there are.All pictures are from here: Page on apcdistributors.comStandby or offline type:Power is normally directly taken from the Utility with some filtering and surge protection. When the utility fails, the power switches to the inverter. The term standby is due to the battery and DC/AC inverter being in standby most of the time. There is a slight break in output power of several tens of milliseconds that wouldn't affect most computers and devices but may very adversely affect Industrial Control systems. These are electrically more efficient in normal operation and low cost. Line interactive type:Power is also normally directly taken from the utility with more active filtering for a better waveform output. When the utility has some distortions outside of set boundaries, the Inverter kicks in the direction from DC to AC. As the inverter is constantly connected to the output, there is no break in output power during switching from utility to battery. So these are also used by Industrial Control systems. These are less efficient and higher cost. Online or double conversion type (the term in the question):Power is always converted from the utility's AC to DC and back to AC to the output. When the utility blacks out, the battery starts to supply to the DC portion instead of the rectifier. As the output power is constantly generated by the inverter, it's output waveform is the most perfect of all. So these are suitable for use by any application that demands high quality electrical supply. Due to the constant double conversion, they are less efficient and higher cost due to the additional components.
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What is the difference between a UPS and an Inverter?
Technically, difference between UPS and InverterUninterruptible power supply (UPS) provides continuous power supply even there is a power cut. Inverter circuit simple converters battery DC current to AC and supply. Sorry, we know this is the answer you are not looking, and won’t solve your confusion.Practically, difference between UPS and InverterThe terms mean UPS and inverter are different. So first define those terms and explain the differences.UPS: Uninterruptible power supply (UPS) provides power in case of power cut. Mostly used for desktop computers backup.Inverter: It is a power backup solution. The total unit consists of three component the charges (your homes electricity), battery and Inverter circuit which converts DC battery current to electricity. Mainly used to supply backup power to total home.UPS is used on general only to backup your system. If you connect desktop computer on inverter, any power loss, shutdowns the computer as it takes one microsecond to fall over to the backup power solution.Inverter is not suitable for computer backup due to the delay in switching. The computer crash not only leads to the lost of data, unsaved programs, but also may damage hard disk and motherboard.UPS give backup only 10 to 20 minutes. The main intention of it is to provide backup only for small time so that you can save the programs and data. Inverters purpose is to provide power backup to total home appliances, lights, fans.Inverter uses flat plate or tubular battery to store electricity. So it requires continuous maintenance, needs to fill the distilled water toppings at regular intervals of time.Reference:Uninterruptible power supply - WikipediaPower inverter - WikipediaI hope it helps, if you are still facing problems, you can try Inverter Selector. You can select right Inverter with this interactive buying guide. Disclaimer: I am the co-founder of Zelect.
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