A UPS is a Uninterrupteable Power Supply. Questions on repairing commercial ones are generally off topic.
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1answer
99 views
Why UPS for sensitive SMD development?
My friend suggests me UPS for SMD development. I already have a a surge protector over all devices. He recommended the UPS that transmit all energy through its battery and he recommend to find some ...
-4
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1answer
68 views
UPS uninterruptible power supply, is it healthy to have it beside your desktop? [closed]
I hope i'm asking on the correct site, but actually I didnt know where to post this.
But I'm sure electrical engineers knows about this doubt of mine.
I have a UPS for my computer network dim. of ...
1
vote
1answer
81 views
What types of batteries are typically used in UPS (uninterruptible power supply) and why?
They definitely need to be safe for indoor use so they can't vent, they should probably support deep cycling due to the nature of backup power supplies, and I imagine they should have relatively long ...
2
votes
1answer
190 views
Troubleshooting UPS failure
My wife said her office had an old UPS that was being scraped because it wasn't working. I picked it up and plugged it in and nothing happened. No lights, no warnings, nothing.
It's a small ...
4
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3answers
3k views
Battery Backup: C10 vs C20
I am installing a home UPS system of 1400 VA. The UPS is a 24 volt system and, based on the batteries available on the market for the UPS segment here, will need 2 x 12 volt batteries for it.
Based ...
1
vote
1answer
100 views
Does a low-quality UPS affect its battery life?
People say that "local" UPSes (uninterruptable power supplies) reduce the life of their batteries while other, "branded" UPSes are better and do not affect the battery life.
I have noticed that a ...
0
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1answer
236 views
ups 12v 9ah batteries not charging
I have a 2000VA ups that contains 2 batteries ( 12V 9Ah ). I think that something happened to the batteries, since now they can barely handle an average laptop for about 3 minutes before shutting down ...
5
votes
1answer
160 views
volt-ampere (VA) rating of UPS
I would like to ask about the volt-ampere (VA) rating of UPS. Is there any effect of this value in terms of the time period that the UPS can supply the power?
2
votes
1answer
108 views
Should I look for Aluminum or plastic enclosure for UPS
I am on the process of material selection for the UPS I am prototyping. My plan is to manufacture a product that should finally go to the market. I am relatively new to the manufacturing and I would ...
4
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1answer
115 views
Tapping the battery from an UPS to feed low voltage devices
My UPS powers one 120V AC device and a whole bunch of small 'bricks' that end up rectifying things down to 5-12V DC. Instead of using the 'bricks', my idea is to tap the battery directly, and use ...
4
votes
2answers
443 views
Replacing a battery in a UPS
I recently replaced the battery in my APC Back-UPS CS 650 and of course I didn't opt for an original APC battery, but just bought a similar one from the corner electronics shop.
Apart from the ...
7
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1answer
3k views
Some advice on charging circuit used in simple UPS
I have looked around for some way of having a 5 volt power supply that acts like a UPS.
Basically want to use a micro usb connector for +5 have a battery and li-ion or other charging circuit that ...
3
votes
1answer
1k views
Fixing APC UPS buzzing noise
I have an APC UPS and one of the caps - an SIEMENS EPCOS 20uF 150V Capacitor - started making a buzzing noise.
This seems to be a AC, non-electrolytic capacitor and most local stores have it priced ...
1
vote
2answers
570 views
UPS connected back to back
this is a theoretical thought.
As we know UPS (online ups) . We have outlet from where we connect to other device. And there is a plug point from which we charge.
Now my question is what happens if, ...
8
votes
5answers
585 views
Does reactive power cause extra fuel use in a Diesel UPS?
It is a bit of a theoretical thing, of little practical use, but I just want to understand the physics behind it. I am aware that I'm simplifying things quite a bit.
In electric power we ...
2
votes
1answer
184 views
What is the current limit on each phase of a 160 kVA three-phase UPS?
I'm a physicist by training, so I think I understand voltage, current, phase and power. However, I lack the knowledge to translate between this and the published ratings on three-phase electrical ...
3
votes
2answers
727 views
Effect of Battery charging with un equal batteries in parallel
I have 24 VDC to 220 VAC Inverter and two 90 Ampere Batteries now I feel that backup is not what I need now I intend to connect these two existing batteries in parallel to give total of 12 volts and ...
2
votes
3answers
198 views
What's wrong with my UPS?
We have a battery & UPS setup on communication systems for an isolated site (wind farm). Last night was the first time the system was put to the test when our grid connection was lost at 11.30 pm, ...
0
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4answers
3k views
How long will laptop run from UPS? [closed]
The laptop has input: 18.5V, 2.7A
The UPS output is: 220V, 6.82A and also something about 1500AP
I have no idea how to work out how long I would be able to run the laptop off the UPS when the UPS is ...
6
votes
2answers
439 views
Can I connect a capacitor in parallels to power supply of a router
In the building where I live, because of older wiring, the mains voltage frequently drops for a fraction of a second and this restarts my wifi router. I am planning to solder a capacitor in parallel ...
5
votes
4answers
442 views
I want to build a DC powered computer, what are the gotchas, where are the parts?
Google builds its servers with a Battery in the box so that they don't need a UPS. I'm wanting to do the same, but I'm wondering what all the gotchas might be for doing this, and where I'll find the ...
4
votes
1answer
297 views
Voltage used to charge a UPS-Inverter and its usage
I'm new to this area and know very little about electrons and how electrical components work. I'm always curious about Inverter/UPS usage.
I'm from India and we have a inverter at home. It is ...
10
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4answers
669 views
Don Lancaster's Magic Sinewaves
For several years now Don Lancaster is promoting magic sinewaves. They are strings of binary digits (like 420 bits for a full sine cycle) that, when used to drive a digital switch (MOSFET/IGBP), ...
5
votes
5answers
5k views
12V DC UPS for Network Equipment
Many times we want to kept running low power devices like DSL modems, etc.
Most of these devices take 12V/9V DC so why to use ordinary UPS which convert AC to DC to AC, lots of conversion lots of ...
3
votes
5answers
250 views
How can computer parts suffer if the computer isn't protected by an UPS?
In datacenters it's common to use Uninterruptible power supply (UPS) to protect the computers. They are used for several reasons, but one is that electronics possibly can suffer from the power grid if ...
3
votes
3answers
409 views
Plugging a UPS into an inverter
First off, I am aware that plugging an UPS into an inverter is a bit redundant. The only situation I can think of it being useful is in a car when you want full amps for cranking over the motor but ...
7
votes
3answers
2k views
DIY 12 Volt UPS
Hi i am trying to make a UPS for a project that requires 12Volts.
I'm currently using a replay diode and capacitor.
My problem is that when the switchover occurs, the voltage drops from
12Volts to ...
