Battery Power Supply
Uninterruptible Power Supply – External Battery Testing
Batteries provide the lifeblood of most uninterruptible power supplies (UPS) and power protection solutions (some are powered by flywheel energy storage devices but most contain batteries). They provide protected loads with continuous energy in the event of a mains failure, which will support loads whilst a generator or alternative power source starts up or provide enough time to gracefully shut down equipment or ride through short duration power cuts.
Often, external battery ‘strings’ or ‘sets’ (a collection of additional UPS batteries, in blocks, providing extended runtime – runtime over and above that supported by the UPS’s own internal battery) constitute a large part of an uninterruptible power supply. A whole battery string, however, is only as good as its weakest battery. It is, therefore, imperative to regularly test UPS batteries and battery strings for ‘weak links’, which should be immediately replaced – even if they have not quite fulfilled their design life, which for UPS batteries is five to ten years.
There are various methods for electrically testing UPS batteries:
- Automatic battery set testing (by the UPS itself).
- Load bank discharge testing or battery set, string and individual cell testing.
- Electro-chemical testing.
Many uninterruptible power supplies are designed to test their batteries every 24 hours and will sound an audible alarm if a battery fault or condition is detected. How it works is that the test places a load on the battery set and the discharge performance is monitored. This is a basic type of test, however, and cannot be relied upon to give detail – other than an overall indication of the state of a battery set. Battery sets usually age uniformly but individual blocks of batteries can fail earlier than others and be rendered unable to sustain a reasonable level of charge, which can bring the whole set down under load conditions.
A more accurate and reliable way to test batteries or battery sets is to use a load bank, which places a load on the set from which measurements can be taken intermittently to assess its discharge performance. But even this has its limitations. The disadvantages of load bank testing are that it reduces resilience whilst the system is being tested, which for critical applications like hospitals or financial processing is unacceptable.
For large battery sets, individual block testing is much more reliable and need not take up additional man-hours as it can be incorporated into a routine maintenance visit. It should include a visual inspection to check that battery casings are not damaged or showing signs of aging such as buckling and emission of electrolyte discharge, which can sometimes be seen around terminals and valves.
Sulphating Batteries:
Because UPS batteries employ an electro-chemical process, they can deteriorate over time (months and even years). When batteries sulphate, Lead Sulphate crystals form within their electrolyte and at plate terminals, which will reduce charging performance and prevent normal operation. They can be recovered from this state (if caught early and their degree of sulphation is not great) by being charged at a higher current for around 12 hours. But care must the taken as this process itself can generate heat. If the battery does not recover through this means, it must be immediately removed and disposed of (by a licensed engineer) and replaced.
Impedance Testing:
Impedance testing can identify battery blocks that are about the fail. As batteries age, internal resistance (restriction to the flow of ions between the positive and negative plates) increases. Impedance testing consists of applying an ac voltage, suitable for the Ah size of battery, through probes attached to the battery block terminals. Impedance (in milliohms) is measured and recorded and compared to published data from manufacturers and/or previous recordings.
Electro-Chemical Testing:
Electro-chemical testing relies on measuring the frequency response to voltage and current signals passed into the battery using probes placed on the positive and negative terminals.
Electro-chemical testing is a non-invasive method that uses the principle of Frequency Response Analysis (FRA) to compare measured data to algorithms of known battery conditions, specifically sulphate and electrolyte dry-out. This problem is the principle cause of UPS battery failure and poor performance. Although originally only available in laboratories, electro-chemical testing can now be applied to uninterruptible power supply batteries using a specially designed, portable hand-held testing unit.
As batteries are so important to an uninterruptible power supply and monitoring and testing them relatively quick and easy, care must be taken to ensure it is done with precise regularity to ensure reliability of power protection solutions. This article was compiled using information available in The Power Protection Guide – the design, installation and operation of uninterruptible power supplies (ISBN: 9 780955 442803). By Robin Koffler and Jason Yates of Riello UPS.
About the Author
Robin Koffler is the General Manager for Riello UPS Ltd the UK subsidiary of Riello UPS (RPS S.p.A) a leading European manufacturer of Uninterruptible Power Supplies and a co-author of The Power Protection Guide(ISBN 978-0-9554428-0-3)- available from Amazon.com
Make a 12 VDC power supply for RC LiPo Battery Chargers.
|
|
2 “AA” CELL BATTERY HOLDER-LOOK! $5.00 |
|
|
65w Laptop AC Battery Charger for HP G60t g60-120us g61 g71 Power supply $7.15 |
|
|
DIGITAL POWER SUPPLY 120-240 INPUT/ 5.1, 12, 24 OUT $19.99 |
|
|
NEW Radio Shack Battery case box holder for 4 x D size cells (6V) 270-396A $3.99 |
|
|
New Trojan T 875 Golf cart Battery FREE DELIVERY TO MOST LOCATIONS IN LOWER 48* $149.99 |
|
|
ALLEN BRADLEY 1747-BA SERIES A LITHIUM BATTERY FOR SLC 500 NEW $57.00 |
|
|
NEW Radio Shack Battery case box holder for 4 x D size cells (6V) 270-389B $3.99 |
|
|
AC Adapter for HP Compaq G G70t g50 g60-100 Laptop Battery Charger Power Supply $0.49 |
|
|
ENERGIZER ER-HM450 BACK UP BATTERY 12 VOLT $20.00 |
|
|
Trojan T-145 Deep Cycle Battery FREE DELIVERY TO MOST LOCATIONS IN LOWER 48* $194.99 |
|
|
65W AC ADAPTER CHARGER 4 Acer Aspire 3610A 3620A Battery Charger Power Supply $10.99 |
|
|
New educational Solar Energy Power-Supply Mini Car , no Battery Require $2.90 |
|
|
New Trojan T-125 Deep Cycle Battery Free Ship* EPBS $154.99 |
|
|
4x Plastic Battery Holder 3-cell AAA PC 2479 $5.96 |
|
|
12cm DC Power Supply Male Plug to 9V Battery Clip 2 Pcs $6.94 |
|
|
Power Supply USB Port Battery Wall Charger for LG P970 $5.54 |
|
|
PAG 9752 2-Position Compact Battery Charger PAGlok Batteries Power supply XLR BP $392.97 |
|
|
Spark Plug Wires Ford Pinto or Tractor Fiber Core NEW $9.99 |
|
|
Keystone 233k 9 Volt Battery Snap 6″ Lead Lot of 959 ea $94.99 |
|
|
POWER SUPPLY DEVELCON ELECTRIC DS530PS 25V 2 AMPS $99.99 |
|
|
☆OEM Dell PA-4E AC Adapter Power Supply Battery JU012 DA130PE1-00 130W PA-4E☆ $27.50 |
|
|
90w AC Adapter for Dell Inspiron 1520 1525 1526 Battery Charger Power Supply $0.49 |
|
|
Lot Broken 16 PC Parts RAM Power Supply Cell Batteries $19.99 |
|
|
10x Power Driver F 1x 3 Watt LED Light Lamp 12V MR16 Y $0.90 |
|
|
Portable Solar Panel Power Supply Charger for 4x AA/5 Rechargeable Battery 1.5V $20.99 |
|
|
New AC Adapter for Dell Inspiron E1705 E1405 E1505 Battery Charger Power Supply $0.49 |
|
|
Astec LPS155, 24 to 28 V, 6.2A, 150W switching power supply, NEW $19.99 |
|
|
VICOR VI-FKE6-CQX OFFLINE FRONT END $50.00 |
|
|
A175 7.5V Alkaline Battery 100mAh 1501M, 5LR44, EN175A $2.32 |
|
|
Belkin Residential Gateway Battery Backup – 12 Volt Power Supply , BU3DC001 $0.99 |
|
|
Black & Decker EHC650 2-Speed Food Chopper with 3-Cup Bowl $18.78 This electric food chopper accomplishes a food processor’s principal function of chopping and mincing without having to haul out the big machine. It’s just 8 inches high and 4-3/4 inches in diameter, and its 3-cup bowl is ample for many chores in a family household and most chores in a one or two-person household. At 150 watts, the motor is powerful enough to chop or mince vegetables, fruits, herb… |
|
|
Black & Decker HC306 1-1/2-Cup One-Touch Electric Chopper $13.99 You’ll use this handy 1-1/2 cup, 70 watt chopper to quickly chop onions without shedding a tear, as well as for chopping many other recipe ingredients. With one speed and pulse and a safety lock, the bi-level stainless steel blade makes quick work of each task. The parts are dishwasher safe for easy clean-up…. |
|
|
Black & Decker EK700 9-Inch Electric Carving Knife, White $12.92 Slimgrip Electric Knife In White. Includes 9 Stainless Steel Blade Trigger Lock Non-Slip Blade Removal Tabs Non-Slip Grip And Flush Cut Blade Design…. |
|
|
HP Pavilion DV2135br Battery Replacement $11.18 While the tempos on Groove Armada’s Vertigo vary from Fatboy Slim-ish party rockers to Air-like downtempo ambient grooves, the songs themselves are downright simple, sample-laden, and sugary sweet. And though those adjectives would be fightin’ words in many contemporary dance subgenres, it is not meant as anything other than praise here. The sophomore full-length by London duo Tom Findlay and Andy… |
|
|
Black & Decker AF-100-3ZP 30-Feet 0.065-Inch Line String Trimmer Replacement Spool, 3-Pack $11.50 Black & Decker String Trimmer Auto Feed System Replacement SpoolThe Black & Decker string trimmer Auto Feed System replacement spool provides a 30-foot replacement line for use in your auto feed string trimmer. This factory wound spool offers maximum reliability and eliminates the hassle of having to wind the spool yourself. The exclusive Black & Decker Automatic Feed Spool (AFS) system automatica… |
|
|
Belkin Mini Surge Protector Dual USB Charger $13.30 Protect your electronic devices while traveling…. |
|
|
Black & Decker Pivot Vac 18V Cordless Pivoting Hand Vac, PHV1810 $40.58 Exclusive 10 position pivoting nozzle provides ultimate vacuuming accessability up high, down low, and in between. Integrated extension nozzle for 50% more reach in tight areas. 18V of power and strong motor provides 35% more suction power. Cylonic action filter stays clean so that suction power stays longer. EZ Clean wheel system instantly improves suction power. 3 stage filtration provides clean… |
|
|
Learn Sun Power:(DVD) How to Set up Batteries, Inverter, Charge Controller, and Panels for a Complete Off-grid Solar Energy System $39.95 If you want to put together a solar power system yourself this DVD is for you. Although it covers an off-grid system it is just as helpful for someone who wants to be partially on grid but would rather set up the system themselves. This is not an overview but rather programmed instruction. This DVD shows, step-by-step, how a 650-watt, off-grid, do-it-yourself solar-panel system was set up. The sys… |
|
|
Behringer BAT1 Replacement Battery Power Supply for EPA40 $14.99 The Behringer BAT1 Replacement Battery Power Supply is specifically designed for your EPA40 device. |
|
|
Cac Power SUPPLY/BATTERY Charger 0030116 $163.5 Cac Power SUPPLY/BATTERY Charger 0030116 |
|
|
Power Supply $47.7 Power SupplyWHRPS-2406 Power Supply is 24 VDC, 600 mA to power the WHSA-H5. It is fully regulated and filtered and includes a 6 ft. AC power cord. “A” Battery. Comparable to Valcom V-624B |
|
|
1175043L3 – Adtran Ac Power Supply / Battery Charger – Ac Power Supply $183.03 [2404507] UPC: 607565012082 UNSPC: 39121004 12.5L x 6.1W x 3.4H 2.9 LB 1.14 Cubes |
|
|
Adtran AC Power Supply / Battery Charger $179.99 110 V AC 115 V AC 1175043L3 Total Access Chassis: 750 850 AC AC Power Supply / Battery Charger Adtran Proprietary Power Supply www.adtran.com |
|
|
Prs48 – Bogen Prs48 Ac Power Supply – 24W Plug-In Module – Ac Power Supply $61.35 the Prs48 AC Power Supply is Designed to Supply Power to Battery-operated, Other Low Voltage DC Equipment. Rugged, Versatile, And Dependable, Making Them Suitable For Many Types of Applications. [GF9159] UPC: 765368200454 UNSPC: 39121004 3.5L x 3.5W x 3.5H 1 LB |
|
|
Pro Co Rps-1 Rat Battery Eliminator Power Supply $15.95 Pro Co RPS-1 RAT Battery Eliminator Power Supply |
|
|
Chattanooga Alliance Battery Power HE Upgrade Kit $744.99 Battery Power HE Upgrade Kit for use with CHT-1900. |
|
|
Eventide PowerFactor Stompbox Power Supply $220 The Eventide PowerFactor Stompbox Power Supply will simultaneously power up to 3 Eventide stompboxes plus up to four additional pedals. Having 10 regulated and well-filtered DC outlets configured in 8 isolated sections, the PowerFactor will provide steady, clean power for best performance. With a total of 1,600mA it’s a perfect solution for bigger rigs only with pedals using a DC power source. The PowerFactor’s three powerful sections with 400mA each will power up to three Eventide stompboxes. The first 4 outlets, offering 4x100mA, are perfect for standard 9V battery operated guitar effects pedals. Eventide PowerFactor Stompbox Power Supply Features 10 outlets configured in 8 isolated sections Toroidal transformer with additional magnetic field shielding 3 powerful DC sections for Eventide stompboxes Short circuit protection of all outlets Advanced LED monitoring of each section Temperature monitoring 115V/230V mains voltage selector switch Mounting kit for pedal boards included Durable steel enclosure with 2mm thick top 5-year warranty |
|
|
Shure SBC200US Dual Docking Charger with Power Supply $249.95 The Shure SBC200US Dual Docking Charger has advanced rechargeability for 2 Shure SB900s and comes with a power supply. Shure SBC200US Dual Docking Charger Features: Dual-docking Shure battery charger for (2) Shure SB900 Lithium-Ion Rechargeable Batteries Charges either (2) Shure SB900 or (1) ULX-D Handheld Transmitter and (1) ULX-D Bodypack Transmitter, each containing an SB900 4 SBC200 can be linked together for use with a single power supply Power supply is included with the SBC200US Includes charge status LEDs for each battery The Shure SBC200US Dual Docking Charger is a dual-bay battery charger for 2 SB900 Lithium-Ion rechargeable batteries. SB900 is the rechargeable powering option for the PSM 900, PSM 1000, UR5 Portable Diversity Receiver, and ULXD Digital Wireless Systems. Lithium-Ion chemistry and intelligent Shure battery circuitry results in rechargeable batteries with zero memory effect. The battery can be recharged using the SBC200 at any time; a complete discharge is never necessary. Full charge can be achieved within three hours and a 50 percent charge within one hour. The SBC200US also features charge status LEDs for each battery. |
|
|
Rothenberger H88953 Power Supply (ROCAM) $219.75 Rothenberger H88953 Power Supply (ROCAM) Rothenberger H88953 Power Supply (ROCAM) Features: Reserve battery: Prolongs battery-powered operating time Clicks into place: Won’t fall out |
|
|
Medfusion Power Supply $142.6 Medfusion Power Supply |
|
|
Asy-0674 – Eaton 3000 Va Ac Power Supply – 3000Va – Ac Power Supply $1100.33 the Optional Battery Charger Module is Designed to Provide Additional Current For Faster Recharging of Uninterruptible Power System (ups) Battery Modules in Systems With Many Batteries. [834470] UPC: 743172001863 UNSPC: 39121004 18L x 18.5W x 8H 21.4 LB 1.49 Cubes |
|
|
Midtronics Inc MPPSC550SKIT Power Supply and Battery Charger $587.71 Midtronics PSC Power Supply/Battery Chargers provide clean and reliable power for charging and maintaining battery stateofcharge during service reflash complex maintenance and in the showroom where vehicle demonstrations can require significant power from the battery. Allows for vehicles to be displayed with all electrical features and accessories activated. Great for maintaining the battery while powering aftermarket accessories that drive sales. Provides a constant clean power supply for using scan tools and reprogramming of ECMs without discharging battery. Automatically maintains the battery when performing complex mechanical service. Advanced switchmode design Provides a cleaner more reliable power source than a standard charger Fully regulated DC output prevents overcharging of the battery and provides precise control to maintain the necessary battery voltage during complex service and reflash Quiet small and compact for portability. Commercial design and heavyduty internal components ensure years of continuous use. Multiple protection features for a long troublefree life: Reverse battery polarity protection via replaceable fuses Brownout input protection Overcurrent protectioncyclebycycle peak limiting as well as rated currentlimiting to maximize the life of the converter. Overtemperature protection. Unique proportional fan control circuit Sets the fan speed directly proportional to the converter s internal ambient temperature enabling the fan to turn on and off very slowly minimizing unwanted fanstarting noise. High quality detachable cables for easy field service. Optional protective carrying case for storage or during use Power Supply Voltage Regulation: 13.6V Maximum Amps Output at Regulated Voltage: 55A On/Off: Yes with Power LED indicator Protection: Internal Breaker Removal Cable Set: 6 Clamp Set Soft Protective Carrying Case: Optional. |
|
|
World Tour AD-1 Power Supply $11.95 The World Tour WTAD1 is compatible with Casio SA39 and SA75 keyboards. Extend your battery life by using this optional AC adapter while you are at home or near an electrical outlet. |
|
|
12V 5w Solar panel back up power supply built in 1200mA rechargeable battery Alarm system power supply (ZC-S017) $39.99 Alarm system solar power supply ,solar panel ,with build in 1200mA NI-MH reacharge battery, Usually,it can supply 10day power |
|
|
Stinger SBC6A Proprietary Power Supply $111.99 110 V AC 12 V DC @ 6 A 2 Year Limited Automobile Lead-Acid Rechargeable Battery Proprietary Power Supply SBC6A SBC6A Proprietary Power Supply Stinger Stinger Electronics www.stingerelectronics.com |
|
|
Dunlop DCB10 DC Brick Power Supply $119.95 The Dunlop DCB10 DC Brick is the most reliable and consistent way to power your effects. Forget the collection of wall warts… the DC Brick will drive ten (10) pedals from the same source! More than a power supply, this box is a power conditioner as well. Unlike aging batteries, the Brick supplies a predictable voltage at all times, keeping your effects consistent from show to show. Its FCLC (Foldback Current Limiting Circuit) provides ultimate protection against power shorts and overloads. Even at full load, you’ll enjoy the quiet and cool operation of a fully regulated power supply. But since battery-powered effects rarely exceed 30 milliamps each, you’re not likely to use anywhere near the Brick’s capacity of 1000 milliamps output! Ten effects power cords are included with the DC Brick. Seven are for 9V applications, and use two different ends. The mini-phone plug end (3.5mm) plugs into the DC Brick, in one of the seven 9V jacks along the front. The other end uses a 5.5mm x 2.1mm industry standard plug for your effects. Three cords are included for 18V effects power. These have 5.5mm x 2.1mm connectors at both ends, and can be plugged in either direction. ALL included cables use the industry standard polarity of positive (+) barrel and negative (-) center. |