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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Danger when using UPS with static

I just bought a UPS Neo 650A, I managed to install it and it works correctly, but I have a doubt, sometimes I have static and I usually get electrocuted with the keyboard or the mouse, so if I touch ...
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Switchover delay in my UPS circuit

I previously posted a question regarding my circuit. I was having a delay in my circuit releasing the relay when the power was down. Some people suggested to try out some stuff and I did that but, I ...
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Can I directly connect four lead acid batteries for UPS (MeanWell ADD-155C)? Which voltage should I set?

I want to power my Mikrotik HEX POE switch which accepts up to 57V DC through a DIY UPS. I want to build it from a MeanWell ADD-155C which haa battery connector (<...
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Can anyone help me with this delay problem in my UPS circuit?

I am trying to build an UPS for my laptop. My laptop doesn’t have a battery and battery port is damaged, only way I can power my laptop is from the DC port. But the problem is where I live power ...
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How to calculate the power of an uninterruptible power supply (UPS)

I was looking at the datasheets of some UPSs and I noticed some oddities: https://www.durantesrl.it/assets/files/serie-compact.pdf For example, the COMPACT 1000 model claims to have a capacity of 600W,...
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Will a leisure (camper, caravan) battery work fine with a UPS to a home pellet stove or does it need to be a high-end AGM sealed battery?

I have just bought a standalone UPS for my pellet stove home heating system as we live in a rural area so we get a lot of blackouts. It's the type that you add a large deep cycle battery to externally....
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Battery drain on a simple UPS circuit

I've got a question about this very simple 2 diode UPS circuit, using a non-rechargeable battery. Basically, the battery takes over the circuit when the external mains power supply is removed (...
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Help understanding audio interference from laptop when using UPS device

I have no Electrical engineering experience and would appreciate a layman's explanation on what my issue is (if possible). My laptop battery became swollen a few months back so I removed it and have ...
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Powering Arduino from Li-ion Battery

I am trying to make a emergency button with Arduino Nano. it should work with and without input voltage. So that I made this circuit. if there is a input voltage 5 volt NANO should directly suppling ...
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single core vs multicore LV power cables

For a three-phase UPS system of 400 V, disregarding the cost, is it better to install for 3 phases plus 1 neutral plus 1 ground five single-core cables. One 3-C cable plus two cables each is 1-C. ...
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Adding 12V DC jacks to desktop UPS in order to connect ONU and router

I get a backup of only about 10 minutes when my FTTH ONU and WiFi router are connected on the 220V ports of my desktop UPS. So, in order to avoid the conversion loss, I want to install two 12V DC ...
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Double conversion UPS off a modified sine input?

I have a 2000W modified sine wave inverter running from 12V bank in a tractor-trailer. It’s company owned, so no changing or adding equipment. Only viable solution I can see to achieve a sine wave is ...
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Laptop running on house inverter adds flickering to lights, was wondering if a capacitor can help [closed]

I recently installed a pure sine wave inverter system (Exide GQP 24V 1450VA) capable of delivering a 1000 watts to combat frequent power cuts. The inverter is wired at the mains input of the house and ...
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Can I use direct 12V batteries to power PCs/cameras/Raspberries instead of converting to AC and then back to DC?

I'm planning on building a new house. One of the things I want to do is to set a special powerline for all high priority electronics like cameras, PCs, Raspberries (for domotic system.) My idea is to ...
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Relay is not switching in time

My circuit is very simple: it is a 12 VDC battery, a 14.4 VDC charger, 12 VDC power supply and finally devices on load. What I intended to do is to make a UPS system here on DC between the battery and ...
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Online UPS ground question [closed]

A very simple question before I purchase an online UPS. I have a ground loop problem with an audio workstation, I temporarily removed the earth (to test only) and the noise went away, so I am ...
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unexpected power loss in double conversion ups

I have picked up a 6kva (4000w) online ups made by MGE (now eaton). It is a used otherwise it functions correctly. The AC input and output rating is 220v. The battery pack is 240v DC the charging is ...
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UPS for WiFi router (automatic switching between battery and DC adapter )

I want to make a UPS for a WiFi router. Following is the schematic I am thinking to implement. My idea is to implement the following: The input DC adapter will provide power to the two converter ...
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Would a simple UPS catch power dips?

My question is, can a simple small UPS provide a solution for power dips? Both from before and after the UPS? I don't need the UPS to run the machine for hours, just for catching the power dips. ...
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Can a super capacitor in parallel make a power bank usable as UPS?

I want to use a power bank as UPS for my Raspberry Pi but it doesn't has pass-through power, so whenever mains power gets connected or disconnected, the power bank cuts off power supply to the Pi for ...
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Can I combine batteries and a transformer to power a device at same time? [duplicate]

Particularly i want to buy this smart lock tuya X2 (dont know if exactly the same of the link, just for reference) link and a I want to get the more possible rid of the preoccupation of getting ...
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Is this UPS isolated, and how? [closed]

I have this UPS: APC Smart-UPS SRT 2200VA RM 230V. I am not located in the UK, but the device is intended for the European market, I am linking to the UK version of the APC website so it is in English....
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Using a rechargeable LiPo/Li-ion battery as "burst" current source

For a project I'm working on, I need to run a motor for a few seconds (somewhat rarely). The motor requires 24V@1A. The rest of the circuitry runs on 3.3V@300mA. My general thought is to use a 3.7V ...
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How to attach a relay or any circuit to make a solar inverter work as UPS

I just purchased a new 2.5kW solar inverter. It has following out put functions When solar power is available it will give AC power from it if solar power is low it will get power from battery and ...
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Running a pedestal fan over UPS [closed]

I'm considering buying a UPS to power a pedestal fan during power outages. My fan is 60W. I was contemplating buying this UPS model, which is set at 360W. Will this work at all? Or are mechanic ...
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MOSFET for switching between two voltage sources

I am making a UPS for a WiFi router. My goal is to get 12V uninterrupted power at the DC jack J2. The buck converter XL4015 is used to charge the 18650 battery pack (2S or 3S) and boost converter ...
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12V with 3.7V backup battery. Which topology is better for battery life?

I have an STM32 based vehicle tracking circuit with an SIM808. I want to use it in vehicle with an LM2596 regulator and a 3.7V li-ion backup battery. I searched and found out that there are two ...
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3000VA UPS Battery advice

I am planning to upgrade my current UPS (BN1500M2, here) to a bigger 3000VA so that it can handle power outage longer (at least an hour for 300W load). I found these two UPS (SMX3000RMLV2U, SRT3000XLA)...
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Why did the transformer heat up when connected to a UPS?

I have an electromagnetic vibratory feeder with 2-phase input, 380 V, 0.35 kW. We noticed that the feeder has stable performance when it is connected to a generator because it has constant frequency ...
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An extender for the toggle button

I purchased a UPS board. As you can see from the attached image there is an on/off slider switch. I will be putting this kit inside a case. I want to let my customer move this switch, but it is ...
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Can repeated UPS failure due overload damage eletronic equipments?

I had trouble installing a laser print at home that forced me to return to the shop and change it by a new one the next day. Now, reflecting on the issue, I am in doubt over the cause of the problem. ...
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What are the multiplication factors for switching frequencies in 3 level NPC, TNPC and 5 level inverter topologies with 2 level Fsw as reference?

I am trying to compare losses of 2 level inverter topology with that of 3 level NPC, TNPC topologies. However, it may seem not a valid comparison if the switching frequencies of every topology remains ...
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Power distribution switch for auxiliary battery

I'm designing a power distribution system, for connection an auxiliary battery to my system. The idea is to use a power distribution mux, similar to TPS2124 from TI. I want to be able to control the ...
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1 vote
4 answers
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Unstable diesel generator output voltages causing irregular behaviour in uninterupted power supply (UPS) units

I am a technician for a security and access control systems company, and we are experiencing a strange interaction between the clients diesel generator and the UPS unit we installed to act as a ...
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I need to add a UPS to my power supply circuit

I am working on an ongoing project and now have the need to add a UPS or battery backup that will allow our controller to begin a shutdown safely when the power is removed. Yes I know there are plenty ...
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Selectively power peripherals on PCB

Take a look at this schematic, especially on the USB OTG part of it. It uses a SY6280 "5.5V, 2A Low Loss Power Distribution Switch" as a means to control the 5V USB-bus power. I was ...
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Missing market of high power relays?

Searching over the Internet for high power DC12V 100A-200A relay (to switch power on power shortage automatically from power adapter to battery) I have not found any device that is more powerful then ...
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Arduino system ups problem!

this is my first question in the forum because i can't find a solution on my own... i hope you can help me. Also english is not my first language so excuse my writing errors. i design an arduino ...
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2 x 90 Ah 12v deep cycle batteries in series runs 77-90w for under 20 minutes. Why?

I am trying to understand the maths here. I have 2x90Ah 12v batteries in series (24v) and they are powering my computer. The peak power is 120w while the computer is shutting down during a power loss. ...
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Mini-UPS schematic - load-sharing of battery pack and power source

I am a beginner working on a mini-UPS project for a low-power server (computer). I've made the following schematic where I'm trying to achieve the following: Charge 3S 18650 battery pack BMS with 12....
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Can you get an electric shock from a UPS output? If yes then can it be fatal?

I have an UPS of 800 watts which means its output is about 800 watt. I am installing a current leakage breaker to my main supply so that if I accidentally touch any things which produce current my ...
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Supercapacitors for transient power-out for RPi

So I found a RPi Hat (https://juice4halt.com/products) with supercapacitors as a short term UPS for RPi, however it's on the pricey side. I don't necessarily need the communication with the RPi to do ...
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Simple, cheap "Nano-UPS" for 5V/<2A/<10W load (e.g. IP camera), based on 4xAAA batteries (or similar) [duplicate]

There are many inexpensive IP cameras available these days, most of which run on 5VDC supplied via a USB2 cable. Problem: a power interruption of even a tenth of a second is plenty enough to force the ...
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3 phase 208v leg balance and observed KVA

I have a cluster computer system in a small server room, fed by an 80 kva capable double conversion (480v 3-phase in, 208v single phase out) UPS. This UPS has an LCD display showing voltage, leg ...
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Alarm system built with Raspberry Pi + Sonoff RF bridge

I am developing a personal project at the end of which I should be able to build a sort of homemade alarm system. All this should be proof against voltage drops / failures, the whole circuit will be ...
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how to make perfect UPS for Arduino?

Well I am trying to make UPS, uninterruptible power supply, for Arduino Leonardo. This is my circuit I am using for lipo chargher this ICs, it use TC4056A and DW01 . I think main problem is DW01 ...
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How should batteries for an APC SmartUPS SURTA 2000XL be connected?

TL;DR How should a set of 4 lead acid batteries (12 V, 9AH) be connected for an APC SmartUPS model SURTA 2000 XL? This afternoon I set about to replace the batteries on our server room UPS, a job I ...
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Adding a battery to my computer's PSU

Is it possible to simply add a car/truck battery to my computer's PSU output, in parallel, to make sure if there is a power outage, that the computer will seamlessly continue running, for a period of ...
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ATX PSU and offline UPS compatibility

Specifically how well can an ATX PSU and in turn the Computer it is powering cope with power loss for x miliseconds during the changeover from Grid AC to offline UPS inverter AC Can I use offline UPS ...
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Household inverter/battery array to supplement generator

I live in an area that's prone to occasional power outages (e.g., ice bringing down trees in the winter, hay landing on and blowing out transformers in the summer). Last summer we had a standby ...
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