Questions tagged [ups]

A UPS is an Uninterruptible Power Supply that provides backup power when the main power source is lost. Questions on repairing commercial ones are generally off topic.

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53 views

What is this UPS communication IC?

I'm looking inside an Inform brand UPS. On its communication board there are 6 chips. Four optocouplers, one NE555 timer and a mistery IC, pictured below. The communication board only has the USB-B ...
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29 views

UPS in front of an ATS for generator protection

At the countryside house there is this setup: And I am trying to protect the generator and house load from brief ~ 1s power outages like so: It works fine in normal conditions. Trouble is when I ...
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78 views

Li-Ion UPS for a 12V 1.5A Router

I know this question has been asked quite a few times on this site. The closest one i could find is: make-9v-ups-for-router-with-tp4056-and-mt3608. While there are UPS systems designed for routers, in ...
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51 views

UPS Time-Left calculation [closed]

(Note: this is not a "repair" question - I have already decided I need to replace either the battery or the whole UPS) I am probably overlooking something really obvious here, but... here ...
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37 views

How to Calculate UPS Batteries DC to AC Efficiency?

For simplicity's sake, we will use this APC UPS for example: https://www.apc.com/shop/id/en/products/APC-Power-Saving-Back-UPS-Pro-550/P-BR550GI. It has 330W rating, loaded with 66 Watt-Hour (Volt-Amp-...
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47 views

Battery/Charger Not Reaching Float with Load Attached

I'm trying to add a backup/UPS to a system I have outside with the following battery charger - https://www.meanwell.com/Upload/PDF/ENC-180/ENC-180-SPEC.PDF . The DIP switches are set for AGM mode. My ...
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42 views

Power output only when mains power cut and only bu ups

I have a ups in my home.I want to install a fan in my room which run only when the mains power supply is cut and ups is supplying the power.How can I do this.
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70 views

is it okay 4 years old used UPS Battery filling sulfuric Acid insted of Distilled water?

I've 1250VA UPS where I found 2 battery (12V-9AH). which Is used for 4 and years more. When I brought this UPS it gave almost 80 to 90 minutes backup but now it only lasts for 15 min. so I decided to ...
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38 views

How to connect a second battery to my UPS?

I have a UPS, its battery seem to be dying. Earlier it was giving a backup of 30 min, now it has come down to 10 min with the same load. I purchased a battery of the same capacity 12V 7amp, I was ...
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66 views

Make 9v ups for router with TP4056 and MT3608

I am building 9v UPS for my wifi router using TP4056 lithium-ion charging module and MT3608 stepup converter. If USB power is available I want MT3608 to get power from USB (TP4056 Vin Pin) otherwise ...
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38 views

space constrained, cost constrained; super capacitor UPS decision paralysis

I am currently in the process of evaluation of options regarding Super capacitor UPS designs. The requirements are simple, find the most effective solution to keep alive 5V supply line for ~20 ...
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56 views

what is maximum Input voltage for 2s bms

I am making UPS for my 12v broadband router. I am planing to use XL6009 boots converter to booter 8.4 volt to 12v. For charging 2s Li-ion battery with 2s BMS i don't have 8.4v charger. Can I use 12V ...
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54 views

Uninterruptible power supply - How it manages to provide electricity to electronic devices before it shutting down?

I believe there is a lag in time (I think the latency for the switch over can take some milliseconds) when a switch over to the battery backup happens. I understand the electric appliances like motor, ...
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32 views

Is it safe to connect a power strip to UPS?

I need to run a PC and multiple raspberry pis (8 nodes cluster) non-stop 24/7. And my UPS machine has only 3 sockets. Connect a ups to power strip is wrong according to this site: https://www.apc.com/...
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64 views

DIY Computer UPS - Smoothing DPDT Relay 80ms Cutover

I was shopping for a small UPS for my home networking lab closet; total load under 300w at 120v. But then realized I have a spare AGM car battery, 12v solar panel maintainer and 12-120v sine wave ...
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41 views

Sourcing a Relay for AC Power Loss on UPS

I have a system outdoors (~200W) that is powered from the house with a battery backup on UPS. When the UPS switches over to battery power, there is no way to currently generate a notification that the ...
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144 views

Making a bench power supply to test car & bike starter motors at no load?

Does anyone have any information on how much current does a car starter motor draw at no load? It's from a BMW E46 .The motor specs: Power max: 1.4kW Voltage: 12VDC Armature resistance: 0.61 ohm ...
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46 views

Mini UPS 5V Module

I've bought a mini 5V UPS board that I need to coninously power a Raspberry pi. In the image description I see that there are 2 D+ and 1 D- PINS INPUT (wall supply, for example), 2 D+ and 2 D- pins ...
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28 views

Apc backup time calculation

I have APC BX1100C UPS for my pc. it has 2x7.2Ah battery. I have connected to it a router 12v 0.5a, and a monitor 19v 1.3a. Expected it to run 10 hours but it switched off after 2 hours. Does it mean ...
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43 views

What should I use as a test load to calibrate a UPS?

I have a 1440VA (980W) Uninterruptable Power Supply (UPS) which I bought a while back to protect my computers from power fluctuations and possible outages. Recently the battery failed and so I ...
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34 views

Power loss shutdown occurring with Pico UPS

I'm currently suffering from issues where my raspberry pi appears to lose power over time and shut down (I'm using a pico UPS to handle file safe Shutdown). From the symptoms i'm seeing it appears ...
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38 views

Why won't this rpi UPS circuit work?

I was attempting to make a mini UPS for a raspberry pi. The (relevant) bill of materials goes as follows: 250V/50Hz AC to 5V/5A cctv power supply A 2-port mobile powerbank (i.e. it can charge two ...
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46 views

Can I connect 2 identical UPS systems to one battery

I have 2 APC Back-UPS 1300 Pro's that run 2 12V9Ah batteries each at 48V. I would like to increase the run time of them when on battery (each one when their loads are at maximum only last about 4 ...
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97 views

How to choose NTC thermistor?

I would like to make a siren on an UPS backup. I used this board with an 18650 embedded battery: https://www.aliexpress.com/item/32911096857.html?spm=a2g0s.9042311.0.0.24db4c4dn31JsH And this siren: ...
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115 views

Raspberry Pi UPS circuit review request + improvements

Based on this question I created the following circuit: Since I made some (component) changes, first I would like to have a validation of the circuit for long-term usage (and some improvements). ...
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343 views

How to calculate: watts for AVR, VA (volt-ampere) for UPS

I intend to buy an AVR or UPS, and I want to add a few external HDD's & a few Mini PC's. I need to calculate how much power is used by every device so I don't overload the AVR or UPS EXAMPLE: ...
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75 views

2KW - 48V - 240v / 50Hz UPS - Unknown Topology

I am refurbishing a 2kw ups that a friend gave to me. It had failed and had been left in a shipping container on a site and the PCB had suffered some low level corrosion. The PCB is a 2 layer board, ...
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64 views

Uninterruptible Power Supply - Reset the load when power is restored

My system is powered by a redundant supply (UPS). When the input power supply is removed, the system detects this event and it performs a safe shutdown (actually it is a microcontroller that enters a ...
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54 views

Plastic Plugs in Surge Protectors or UPS

Would plugging 4 out of 7 outlets in a surge protector or UPS with plastic “safety plugs” to keep out dust/dirt harm the product in any way? I know that plastic is an insulator and it might affect ...
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68 views

UPS on DC lines

How could a UPS switch between battery and AC wall socket fast from around 4 ms to 12 ms. What make it especial to switch in that very low time. As far as I know it has relays inside it to perform the ...
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696 views

Why does the UPS mode of an inverter have faster switching times?

Of all the sinewave inverters I have used, they contain a switch at the back labelled Normal and UPS. When you put the inverter in normal mode, there is some 40-50 ms switchover time, enough to make ...
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63 views

Arduino for detecting low voltage on UPS

Scraping together some parts, I managed to build a 22AH 12V battery pack, but I don't want to damage the batteries. I am using 4x 12V 5.5AH UPS batteries wired in parallel. I have an Arduino Uno, ...
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100 views

UPS for ESP32 Microcontroller [duplicate]

I have two e-bike batteries. One of which i am using to power my ESP32. Now i want to switch to other battery when my batt-1 is low. I am switching battery using relay. But doing so, I suspecting i ...
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48 views

3 phase to single phase UPS 10 kva [closed]

I have a 3 phase to single phase ups 10kva. The Input voltage required is 332v to 444v/ 3 phase voltage with an output of 220-240v single phase. I have an external battery bank of 2v x 12 connected in ...
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731 views

Why shouldn't two AC sources be connected in parallel?

In data centers, servers usually have redundant power supplies, which makes it possible to plug them to two different UPS units. This way, the server continues to function correctly if one of the PSU ...
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53 views

Connecting a multi-PSU server on different lines with different earthing

I am currently preparing to set up a new server which has two PSUs (for supply redundancy). Of course it would be logical to connect them to different sources, but the situation I'm dealing with ...
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4answers
74 views

How to know how much energy storage has powerbank? [closed]

I just looked to this question and I don't understand how to know how much Wh this powerbank has (click "Specifications" tab), because it has different output voltages and I don't know how to ...
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123 views

DIY UPS for Home Automation/Energy Management system

OK, the original post asked too many questions and I was asked to rewrite the post question. So after reviewing the old post and rethinking the project here it is. So, as requested, I will ask 1 ...
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62 views

Use an Powerbooster 1000c as an ups for an RPi

I'm a pre-newbie hoping to some day reach newbie status. These questions are probably stupid but I would appreciate your input. EDITEDITEDITEDITEDITEDITEDITEDITEDITEDITEDITEDITEDITEDIT I'll try to ...
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43 views

UPS For Mac Mini-based laptop - Sanity Check

My project is home-brewing a laptop that uses a Mac Mini and a small ~7" LCD display. To make it truly portable, I'd like the power system to work like a commercial laptop - ie, powers and charges off ...
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75 views

Switch between 2 AC sources for a DIY Arduino-based UPS

I want to build a UPS that when the main AC source is under-voltage or not available, it will automatically switch to the inverter's AC output and when the main AC source is available again, it will ...
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32 views

Bottom solder on the UPS PCB [duplicate]

Today i was looking at PCB of an old ups system. I noticed that there is a bottom solder pattern on the back side of the PCB, right under the IGBTs I believe that soldering the high power line on the ...
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31 views

Surge Protector Life Span

I work for a small office that is relocating. Recently all new computers have been purchased for staff. In preparation for the move, I noticed that virtually all the surge protectors in the office ...
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1answer
184 views

Poor Man's UPS for a Microcontroller

I'm planning to create a Control Box for my Home Solar System which will involve using a microcontroller (STM32F103C8T6) as my control system. This uC will handle my current sensing for power ...
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71 views

Can I use an h-bridge as a changeover circuit?

I have solar controller which outputs battery voltage when available. I also have a switching psu as backup. What I would like to do: Use an h-bridge, connecting its battery negative terminal to my ...
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138 views

Does return path need a diode?

The following circuit contains an Uninteruptable Backup System (UPS). So if the main battery fails, the UPS auto-switches on to power the essential instruments. (The UPS senses the voltage drop.) ...
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199 views

Unexplained amperage spikes

IT guy here - I have a device called a WattBox in one of my networks so I can remotely cycle power on an outlet. It also provides me with alerts when something falls outside set parameters. I've ...
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45 views

What can I do on the bench to determine if a power supply does or does not add back a PFC (Power Factor Correction)?

I'm given a AC to DC power supply with only the inputs and output specified. It was probably made after 2000, and the ENERGY STAR program mandate to add PFC correction to power supplies may or may ...
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311 views

Should a UPS transformer heat up on no load? [closed]

I have a ups, APC-1100BX whose transformer heats up so much that the top of the body of the UPS gets heated up too. It gets hot to the touch when there is no load. The UPS is ventilated and when the ...
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74 views

high current UPS ish design

This is my latest attempt to try building a ups ish system for my 3D printer the printer is custom-designed with 5 meters (no, it's not a typo) on each axis. we use MKS Gen v1.1 with custom marlin ...

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