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The 8 Best uninterrupted power supply ups of 2024

Are you trying to find uninterrupted power supply ups among various brands on the market but aren’t sure where to begin? To assist you in finding the right one, we’ve put together a list of the 7 best to help you pick the perfect one!

We investigated and evaluated a number of the top-selling uninterrupted power supply ups on the market in order to create our list of the best. Making a decision among the many options available is never simple. There are an infinite number of models available, each with a distinct price. And as you’ll find out, the best options aren’t usually the ones you imagine! This comparison is rich and relevant because of the numerous factors that were employed. You will find products featured in this ranking not only based on their pricing but also on their features and other customers reviews. To write this review, we completed 19 hours of research and did 23 uninterrupted power supply ups tests. You won’t need to pick products at random any more. If you’re unsure of what to look for, browse our list and consult the buying guide!

An overview of our top picks

Table of contents

The best uninterrupted power supply ups you can buy today

SaleNo. 1
CyberPower ST425 Standby UPS System, 425VA/260W, 8 Outlets, Compact, Black
  • 425VA/260W Standby Battery Backup Uninterruptible Power Supply (UPS) System uses simulated sine wave output to safeguard home office and entertainment needs, including computers, gaming consoles, and broadband routers
  • 8 NEMA 5-15R OUTLETS: Four battery backup & surge protected outlets; Four surge protected outlets; INPUT: NEMA 5-15P plug with five foot power cord
  • ADDITIONAL FEATURES: LED status light indicates Power-On and Wiring Fault, transformer-spaced outlets
  • GREENPOWER UPS HIGH EFFICIENCY DESIGN: Reduces power consumption by utilizing a compact charger and power inverter to create an ultra-efficient backup power system for home and office use
  • 3-YEAR WARRANTY – INCLUDING THE BATTERY; $75,000 Connected Equipment Guarantee
No. 2
APC UPS Battery Backup and Surge Protector, 600VA Backup Battery Power Supply, BE600M1 Back-UPS with USB Charger Port
  • Uninterruptible power supply (UPS) with 600VA / 330W battery backup power
  • 7 Outlets (NEMA 5-15R): 5 Battery Backup & Surge Protector; 2 Outlets with Surge Protection Only
  • 1 USB Charger Port (1.5A) for cell phones, small portable electronics
  • 5' Power Cord, right-angle 3-prong wall plug (NEMA 5-15P), wall-mountable. Plus free power-management software for Windows (Mac OS uses native "Energy Saver" Settings)
  • Replaceable Battery: Easily replace the UPS battery with a genuine APC replacement battery, model APCRBC154 (sold separately)
No. 3
Amazon Basics Standby UPS 400VA 255W Surge Protector Battery Power Backup, 6 Outlets - Black
  • Standby uninterruptible power supply (UPS) with 400VA / 255W battery backup; ideal for home networks, IoT devices, and home entertainment devices
  • 6 outlets total (NEMA 5-15R), consisting of 3 surge-protected outlets and 3 surge-protected/battery-backup outlets
  • Protects electronic devices during a power surge; provides reliable power, keeping devices powered during short outages and powered for long enough to shut down properly during extended outages
  • Small compact size integrates easily into any home or office environment; 5-foot cord with NEMA 5-15P right angle and 45-degree offset plug (120V - 50Hz / 60Hz)
  • Note: Power management software is available for download in the "Product guides and documents" section of this page
  • Note: Please check the total device power consumption when applying battery backup outlet; for optimal system performance, keep the load below 80% of the unit's rated capacity
SaleNo. 4
APC UPS Battery Backup Surge Protector, 425VA Backup Battery Power Supply, BE425M, Black
  • 425VA / 225W battery backup power supply
  • 6 Outlets (NEMA 5-15R): 4 UPS Battery Backup and Surge Protection; 2 Outlets with Surge Protection only
  • 5' Power Cord, right-angle 3-prong wall plug (NEMA 5-15P); Wall mountable
  • During a power outage, this APC UPS provides battery backup power for WiFi routers and other small, critical electronics
  • This BE425M APC battery backup comes with a 3-year warranty, plus 75,000 dollars connected-equipment policy
SaleNo. 5
Liebert PST5 UPS - 850VA/500W 120V, LCD Monitoring Screen, Standby Power, 8 Outlets, USB Charging, 3 Year Warranty, Uninterruptible Power Supply, Battery Backup with Surge Protection (PST5-850MT120)
  • UPS offers protection during damaging surges, spikes or power outages and USB communications for notifications and controlled shutdown with free software download
  • With 8 outlets (4 surge only and 4 battery & surge outlets, 2 for transformer-block plugs) and 1 USB Charging Port
  • Surge protection for RJ45/11 and Coax data line surge protection
  • Included Components: Ups Unit, Usb Type A To Usb Type B, 2 Meter (~6.5 Ft) In Length
SaleNo. 6
CyberPower CP1500AVRLCD3 Intelligent LCD UPS System, 1500VA/900W, 12 Outlets, 2 USB Ports, AVR, Mini Tower, Black
  • 1500VA/900W Intelligent LCD Battery Backup Uninterruptible Power Supply (UPS) System uses simulated sine wave output to safeguard workstations, networking devices, and home entertainment equipment
  • 12 NEMA 5-15R OUTLETS: Six battery backup & surge protected outlets; six surge protected outlets; INPUT: NEMA 5-15P plug with 6-foot power cord; USB charge ports (1 Type-A, 1 Type-C) quickly charge mobile phones and tablets
  • MULTIFUNCTION, COLOR LCD PANEL: Displays immediate, detailed information on battery and power conditions; Color display alerts users to potential issues before they can affect critical equipment and cause downtime
  • AUTOMATIC VOLTAGE REGULATION (AVR): Corrects minor power fluctuations without switching to battery power, thereby extending the life of the battery
  • 3-YEAR WARRANTY – INCLUDING THE BATTERY; $500,000 Connected Equipment Guarantee and FREE PowerPanel Personal Edition Management Software (Download)
SaleNo. 7
APC UPS 1500VA UPS Battery Backup and Surge Protector, BX1500M Backup Battery Power Supply, AVR, Dataline Protection
  • APC UPS 1500VA / 900W battery backup power supply.Input Frequency : 60 Hz +/- 3 Hz. Switching current capacity : 15 A. Output Frequency (sync to mains) : 60 Hz sync to mains..Operating Temperature : 0 to 4°C (32 to 104°F)
  • 10 Outlets (NEMA 5-15R): 5 surge protector with battery backup; 5 outlets with Surge Protection Only
  • 1 GB network dataline protection, 6' Power Cord, right-angle 3-prong wall plug (NEMA 5-15P), and free Windows PC power-management software (Mac OS uses native "Energy Saver" Settings)
  • Automatic Voltage Regulation (AVR): instantly corrects low/high voltage fluctuations without discharging the battery, and is Active PFC compatible
  • Replaceable Battery and Energy-Star Certified: The battery can be replaced with APC replacement battery model APCRBC124 (sold separately). This UPS meets the Energy Star Requirements for product specification: Uninterruptible Power Supplies (UPS)
SaleNo. 8
CyberPower CP1500PFCLCD PFC Sinewave UPS System, 1500VA/1000W, 12 Outlets, AVR, Mini Tower,Black
  • 1500VA/1000W PFC Sine Wave Battery Backup Uninterruptible Power Supply (UPS) System designed to support active PFC and conventional power supplies; Safeguards computers, workstations, network devices, and telecom equipment
  • 12 NEMA 5-15R OUTLETS: Six battery backup & surge protected outlets, six surge protected outlets; INPUT: NEMA 5-15P right angle, 45 degree offset plug with five foot power cord; 2 USB charge ports (1 Type-A, 1 Type-C) quickly charges mobile phones and tablets
  • MULTIFUNCTION, COLOR LCD PANEL: Displays immediate, detailed information on battery and power conditions; Color display alerts users to potential issues before they can affect critical equipment and cause downtime; Screen tilts up to 22 degrees
  • AUTOMATIC VOLTAGE REGULATION (AVR): Corrects minor power fluctuations without switching to battery power, thereby extending the life of the battery
  • 3-YEAR WARRANTY – INCLUDING THE BATTERY; $500,000 Connected Equipment Guarantee and FREE PowerPanel Management Software (Download)
SaleNo. 9
CyberPower EC850LCD Ecologic Battery Backup & Surge Protector UPS System, 850VA/510W, 12 Outlets, ECO Mode, Compact, Uninterruptible Power Supply
  • 850VA/510W Ecologic Battery Backup Uninterruptible Power Supply (UPS) System uses simulated sine wave output to safeguard workstations, networking devices, and home entertainment equipment
  • 12 NEMA 5-15R OUTLETS: Six battery backup & surge protected outlets; Six surge protected outlets (Three ECO controlled); INPUT: NEMA 5-15P right angle, 45 degree offset plug with five foot power cord
  • MULTIFUNCTION LCD PANEL: Displays immediate, detailed information on battery and power conditions
  • ECO MODE: When the UPS detects a computer is off or in sleep mode, it will automatically turn off power to computer peripherals connected to ECO mode outlets, reducing power usage and lowering energy costs
  • 3-YEAR WARRANTY – INCLUDING THE BATTERY; $100,000 Connected Equipment Guarantee and FREE PowerPanel Personal Edition Management Software (Download)
No. 10
Tripp Lite SMART1500LCDT 1500VA 900W UPS Battery Back Up, AVR, LCD Display, Line-Interactive, 10 Outlets, 120V, USB, Tel & Coax Protection, 3 Year Warranty & Dollar 250,000 Insurance Black
  • Work though short blackouts & maintain a network connection/ save files safely during longer blackouts: 1500VA / 900W Smart LCD Battery Backup Uninterruptible Power Supply (UPS) provides up to 90 minutes of runtime for an entry level PC system, and 10 min of half-load runtime
  • 10 Outlets protect desktops & all peripherals: 5 Outlets provide UPS Power Backup & Surge Protection (for desktop, monitor, LCD, keyboard, external hard drive, wireless router, IoT device); 5 Outlets offer Surge Protection Only (ideal for printers and other electronics that are not essential in a blackout)
  • Avr corrects brownouts & overvoltages without using battery power: Otherwise known as Automatic Voltage Regulation, this conserves battery power for critical blackouts. Also features TEL/DSL/Ethernet protection
  • Free management software / user replaceable batteries: USB port & free software enable unattended system shutdown and power management. Batteries are fully hot-swappable / user-replaceable
  • Operating temperature range: 32 to 104 degrees fahrenheit / 0 to 40 degrees celsius
SaleNo. 11
1500VA/900W Ups Battery Backup and Surge Protector,Computer Uninterruptible Power Supply Units,SKE Ups Power Supply
  • ★Protect your work and life:Protect desktop computers,workstations,networking devices,and home entertainment devices(e.g.Modem&Router,Smartphone,PC Desktop Computer,Network-attached Storage).
  • ★AVR and Sockets:Automatic Voltage Regulation protects connected devices by stabilizing incoming voltage levels.6 Outlets provide battery backup and surge protection(Battery is charged),2 outlets provide surge protection only(Mains electricity is connected).
  • ★Multi-functional intelligent LCD:Displays real-time detailed information about battery and power condition,including input voltage,output voltage,battery capacity,load capacity,etc.And can automatically extinguish the screen(Boot 30 seconds,in the state of power automatically extinguish the screen;Touch the switch and the backlight will turn on automatically).
  • ★Eliminate noise:When the UPS is in battery mode,the beeping sound will be emitted after 6-10 seconds,which means that the UPS is in on-load state.As long as you touch the on key lightly to turn off the sound,the display screen will display silent state.When the battery is about to run out,the UPS will continuously emit the beeping alarm until the power off.
  • ★Free management software:The software can realize unattended system shutdown and power management.With Cooling fan,high power cooling requirements are solved.
SaleNo. 12
APC UPS 1500VA Sine Wave UPS Battery Backup, BR1500MS2 Backup Battery Power Supply, AVR, 10 Outlets, (2) USB Charger Ports
  • APC 1500VA / 900W battery backup power supply
  • 10 Outlets (NEMA 5-15R): 6 surge protector with battery backup; 4 outlets with Surge Protection Only
  • Sinewave UPS with Automatic Voltage Regulation (AVR), designed for high-end electronics; an ideal battery backup for computer
  • Two USB Charger Ports: (1) USB-C, (1) Type-A (15W shared)
  • Replaceable Battery and Energy-Star Certified: The battery can be replaced with APC replacement battery model APCRBC163 (sold separately). This UPS meets the Energy Star Requirements for product specification: Uninterruptible Power Supplies (UPS)
No. 13
Ups Battery Backup and Surge Protector,Computer Uninterruptible Power Supply Units,Intelligent LCD,SKE Back UPS,Battery Backup for Computer 425VA/240W
  • ★Protect your work and life:Protect desktop computers,workstations,networking devices,and home entertainment devices(e.g.Modem&Router,Smartphone,PC Desktop Computer,Network-attached Storage).
  • ★AVR and Sockets:Automatic Voltage Regulation protects connected devices by stabilizing incoming voltage levels.4 Outlets provide battery backup and surge protection(Battery is charged),2 outlets provide surge protection only(Mains electricity is connected).
  • ★Multi-functional intelligent LCD:Displays real-time detailed information about battery and power condition,including input voltage,output voltage,battery capacity,load capacity,etc.And can automatically extinguish the screen(Boot 30 seconds,in the state of power automatically extinguish the screen;Touch the switch and the backlight will turn on automatically).
  • ★Eliminate noise:When the UPS is in battery mode,the beeping sound will be emitted after 6-10 seconds,which means that the UPS is in on-load state.As long as you touch the on key lightly to turn off the sound,the display screen will display silent state.When the battery is about to run out,the UPS will continuously emit the beeping alarm until the power off.
  • ★Free management software:The software can realize unattended system shutdown and power management.
SaleNo. 14
APC Back-UPS 650 Battery Backup and Surge Protector Black (BVN650M1)
  • Sold as 1 Each.
  • 5 battery backup and 2 surge protection only outlets
  • Surge energy rating: 490 joules
  • Output voltage of 120 VAC to ensure adequate power supply
  • 5' cord allows you to set up your system at a comfortable distance
SaleNo. 15
Vertiv Liebert Power-UPS Lithium, 400VA/240W, 120V, Lithium-Ion, Standby UPS, (4) NEMA 5-15R outlets (3 Battery Backup), Energy Star Certified, Compact Lightweight (PUL-400LVT)
  • LONGER LIFE: Lithium-Ion technology delivers up to 3 times the life expectancy of lead-acid batteries which reduces maintenance, labor, and replacement costs.
  • PEACE-OF-MIND: 5-year warranty gives peace-of-mind that your valuable devices will remain protected and connected.
  • BUILT FOR HIGH-TEMPERATURE: Designed to endure operating temperatures of up to 104⁰ F (40⁰ C), this UPS is ideal for environments with limited airflow and high temperatures.
  • COMPACT AND LIGHTWEIGHT: The compact (W x D x H 4.7in x 8.27in x 5.51in) and lightweight (3.92 lbs) design makes the 400VA/240W Power-UPS Lithium a convenient UPS for any environment where space is limited.
  • 4 OUTLETS: Four total outlets, with 3 battery backup outlets, offer enough space and capacity to protect all your critical electronics.
No. 16
CyberPower AVRG900LCD Intelligent LCD UPS System, 900VA/480W, 12 Outlets, AVR, Compact
  • 900VA/480W Intelligent LCD Battery Backup Uninterruptible Power Supply (UPS) System uses simulated sine wave output to safeguard desktop computers, workstations, networking devices, and home entertainment equipment
  • 12 NEMA 5-15R OUTLETS: Six battery backup & surge protected outlets; Six surge protected outlets; INPUT: NEMA 5-15P right angle, 45 degree offset plug with five foot power cord
  • DATA LINE PROTECTION: Prevents power surges that travel through telephone lines from causing damage to electronics
  • AUTOMATIC VOLTAGE REGULATION (AVR): Corrects minor power fluctuations without switching to battery power, thereby extending the life of the battery
  • 3-YEAR WARRANTY – INCLUDING THE BATTERY; $200,000 Connected Equipment Guarantee and FREE PowerPanel Personal Edition Management Software (Download)
SaleNo. 17
TalentCell Mini UPS Uninterrupted Power Supply 27000mAh 98Wh Lithium ion Backup Battery with DC 12V/9V/5V Output for Wireless Router, Modem, LED Light, CCTV Camera, Smartphone and More
  • High capacity: 3.7V/ 27000mAh (11.1V/ 8800mAh). This lithium ion battery is constructed from lithium ion battery cells, the 27000 mAh is the total capacity of the 12 cells.【Output: 4*DC 12V(voltage range is 9-12.6V), 1*DC 9V, 2*USB 5V】【Input: 12.6V/2A】The size of the DC output/input port is 5.5 mm x 2.1 mm.
  • Mini uninterruptible power supply back up battery pack can power for most 12V/9V/5V DC equipment, wireless routers, telephone, LED strip,monitor cameras, etc. It can provide hours of operation during power failure.
  • Provide short-circuit, over-current and over-charging/discharging protection.
  • Compatible with LED strip light products, CCTV Camera, LED Panel, Modem, Speak, Car DVR, 12v pump etc. Please confirm the size input port of your devices before you order, if it is not DC 5.5X2.1mm port, you need to buy the proper chord or adapter sperately.
  • Package content: 1x Mini UPS lithium battery. 2 pcs DC 5.5x2.1mm male to male Power Cable. 1x 12.6V/2A AC/DC Charger. ★★★Please note, if the size of your device input port is not DC 5.5X2.1mm, you need to buy the proper chord or adapter sperately.
No. 18
RGTTOTG Mini UPS Uninterrupted Power Supply 8000mAh 28Wh Lithium ion Backup Battery with DC 24V 15V 12V/9V/5V Output for Wireless Router, Modem, LED Light, CCTV Camera, Smartphone More Support Solar
  • 【Newest】 The latest product in the autumn of 2023.
  • 【Mini Portable】 Size: 105mm * 105mm * 27.5mm ; About Net weight :250g ,Color:White
  • 【Small body and large capacity] Built in 8000mah 28.68WH Lithium ion Backup Battery ,DC 24V, 15V, 12V, 9V, 5V Output and One USB Output, Support power outage and battery life for routers, light cats, LED lights, CCTV cameras, attendance check-in machines, smart phones, switches, and laptops.
  • 【Supports two way charging】supports DC12V charging and solar charging (solar charging panel needs to be purchased separately)
  • Best feature: One connection, lifelong worry free. The device is powered off for 0 seconds to switch without the need for a restart. The device has four protection functions: short circuit protection, overcurrent protection, overcharging protection, and overcurrent protection. Quality assurance and long service life.
No. 19
Forza UPS 750VA/450W Line Interactive Uninterrupted Battery Backup Supply, 12 Outlets, AVR, LCD Screen, USB, Coaxial, 3 Year Warranty 120V (HT-750LCD) | UPS interactiva
  • RELIABLE AND AFFORDABLE UPS WITH LINE INTERACTIVE TOPOLOGY - Protect your devices and data from power problems with this cost-effective UPS that extends the battery life cycle and provides clean and stable AC power without switching to battery mode.
  • CONVENIENT LCD DISPLAY, USB CHARGING PORTS, AND DATA LINE PROTECTION - Monitor the real-time status of the UPS, charge your USB devices, and protect your network/phone/coaxial lines with this user-friendly UPS that has a LCD display, two 2.1-amp USB charging protected ports, and data line protection.
  • COMPATIBLE WITH MOST DEVICES AND EASY TO USE - Connect your computers, PC, Mac, workstations, network devices, home entertainment equipment, surveillance systems, and more to the twelve (12) NEMA 5-15 outlets, six (6) of which are battery-backed and have automatic voltage regulation (AVR). The UPS has a simulated sine wave output that works with most devices
  • SLEEK AND MODERN DESIGN WITH EASILY REPLACEABLE BATTERY AND 3-YEAR WARRANTY - Fit the UPS in your desks and entertainment centers with its sleek and modern design. The UPS is constructed with fire retardant ABS material that prevents it from catching fire in case of any failures. Access and replace the battery easily from the front panel. Enjoy peace of mind with a 3-year warranty (2 years on batteries) and a free software download allows you to control the UPS from your computer.
  • FORZA UPS CON TOPOLOGÃA INTERACTIVA DE LÃNEA: PROTECCIÃN PARA SUS DISPOSITIVOS Y DATOS - Este UPS rentable ofrece una energía de CA limpia y estable, una pantalla LCD, 12 salidas, 2 puertos USB, protección de datos y más. Tiene 750VA/450W y una onda sinusoidal simulada. Tiene un diseño elegante, una batería fácil de cambiar, material ignífugo y 3 años de garantía.

How to choose a good uninterrupted power supply ups

Does the idea of finding a fantastic uninterrupted power supply ups make you anxious? When it comes to purchasing this product, specifically when deciding which model to select, has your head been spinning between options? You are not alone if that is the case. We are aware of the pressure involved in the purchasing process!

Your presence here indicates that you are interested in uninterrupted power supply ups. Before choosing which product would be the best for your needs after being inundated with information, locate a reliable source with genuine selections. You can get that information from a variety of sources, including buying guides and rating websites, word-of-mouth recommendations from friends and family, online discussion forums where users can share their own experiences, product reviews that can be found all over the internet, and YouTube channels. You can only get the right product through exhaustive analysis. But you realize that’s not always simple. In order to ease your concerns, we have taken the time to develop a list of the top uninterrupted power supply ups products available right now. You might be wondering how we came up with the list. How was this buying guide developed?

First, we used our algorithms to gather as much reliable data as we could about these products. To verify all the data gathered, we used both artificial intelligence and a lot of algorithms.
Then, our experts used criteria that are recognized in the business to evaluate them according to their quality to price ratio, allowing us to choose the top uninterrupted power supply ups on the market right now!

The selection of the goods is not arbitrary. Before creating a list, we take into account a number of factors. Below are some of the criteria discussed:

Brand Value: What happens if you choose a dubious brand just because it appears to be a good deal? So the likelihood of receiving a product with a short shelf life increases. That is due to the fact that well-known brands have a reputation to uphold, while others do not. Top uninterrupted power supply ups brands strive to provide some distinctive traits that set them apart from the competition. So, hopefully one or more of the items on our list will be perfect for you.

Features: Useful features are all you need, not tons of them. We consider the important aspects and select the top uninterrupted power supply ups based on those.

Specifications: Numbers always help you measure the quality of a product in a quantitative way. We try to find products with higher specifications, but with the right balance.

Quality: A product’s quality may always be quantified with the aid of numbers. We look for goods with better standards that strike the proper balance. The best quality product that gets highly appreciated and recommended by experienced users.

Customer ratings:  Would it be accurate to suggest that the uninterrupted power supply ups were used by hundreds of customers before you? Superior ratings indicate that many customers had better service.

Customer Reviews: Like ratings,  provide you with accurate and reliable information about the product from genuine customers. Customer ratings are very important to all of us because they contain accurate and reliable information about the customer service we received from several hundred customers.

Seller Rank: This is very intriguing! Not only do you need a good uninterrupted power supply ups, you also need a product with rising sales that is trendy. It accomplishes two goals. First, the expanding user base proves the quality of the product. Second, given that number, producers must be able to offer greater quality and after-sales support.

Value: You get what you pay for, they say, so consider the value. Cheap isn’t always good and expensive isn’t always bad. However, that does not imply that spending a lot of money on a product that is flashy but underwhelming is a good idea. Before adding them to the list, we make an effort to evaluate how much value you can get for your money from your uninterrupted power supply ups.

Durability: Durability and reliability are closely related concepts. You will benefit from a strong and long-lasting uninterrupted power supply ups for months and years to come.

Product availability: Products come and go, and new ones replace the old ones. Most likely, a few new features and required changes were made. What use is it to use a supposedly good product if the maker no longer supports it? We make an effort to highlight products that are current and offered by one or more trustworthy sellers, if not more.

Negative Reviews: Yes, we do take that into account as well! The goods with the majority of bad reviews are filtered out and disregarded when we choose the best-rated one on the market.

These are the standards by which we selected our uninterrupted power supply ups. Do we end our process there? Hell no. The most crucial fact about us that you should be aware of is that we regularly update our website with current and pertinent information. We have one more layer of filtration since we place the greatest importance on reader satisfaction. Please let us know if any product included here is incorrect, irrelevant, subpar, or simply out of date. We always value your opinions, and we’ll work hard to make any necessary corrections to our list in response to them.

Why should you believe us?

There are now thousands of possibilities for these products on Amazon, but choosing the best one can be difficult and time-consuming. And what uninterrupted power supply ups should you purchase in 2022?

This guide is the result of more than 10 years of experience in researching, testing and writing about many topics. Each member of our team is an authority in their area. We read every article we could find online and every consumer review on every retail website for seven hours. Additionally, we discovered a ton of websites that offered helpful resources, including buying tips and thorough information on uninterrupted power supply ups.