Extended Runtime
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From an entry-level desktop or wall-mounted unit to an 80kVA n+1 installation supporting a major data centre, batteries are at the heart of every UPS (uninterruptible power supply) system. They provide the required runtime and a source of dc supply to the inverter in the event of a mains power failure; when more runtime is needed, it can be extended by adding extra battery packs or battery extension packs.
For a given UPS battery installation the following factors ensure that, when needed, a battery will give its rated runtime: correct operation (following the UPS manufacturer’s instructions), a suitable operating environment (especially ambient temperature), regular battery maintenance and timely battery replacement.
Ideally, a UPS battery will be sized to provide a specified runtime at a specific load, with the runtime being sufficient to do the following: keep loads running, allow start-up of standby generators (automatic and manual if necessary) and allow sufficient time for completion of automatic server shutdown routines.
Battery runtime and orderly system shutdown. Whatever the rated battery runtime, there should be sufficient duration for protected systems to be shutdown in an orderly manner using appropriate proprietary software such as Riello UPS’s PowerShield.
To ensure a required battery runtime, battery size is dictated by load size (measured in kW) and the amount of back-up time required in the event of a mains failure. Most UPS are designed to offer up to ten minutes runtime – enough to cover the most common power interruptions and safely shutdown non-critical loads.
Determining required battery runtime. The required UPS battery runtime, even the decision to specify battery extension packs, will be determined by factors including the following: site power history and existing UPS equipment, availability of a maintained standby generator on site, length of time required for load-shedding and orderly system shutdown, environmental aspects (space, temperature and humidity) and overall cost of long battery runtime versus a standby generator or fuel cell.
Correct operation, maintenance and battery replacement can ensure that a given UPS battery installation performs to the best of its ability. From the smallest UPS (typically used for power protection of small to medium sized file servers, PBX systems and point-of-sale or back-office systems), to the largest industrial series power protection units, UPS battery runtime can be extended by simply adding more batteries.
Battery extension packs for extended runtime. At their simplest, plug-in UPS battery extension packs can extend the shortest (typically ten minutes) internal battery runtime to an hour or more. On larger uninterruptible power supplies, where an inverter is rated for continuous operation, the UPS can be used to support large loads for long runtimes up to and exceeding several hours. This is normally achieved with battery extension packs that connect to the rear panel connector on the UPS (and/or a generator) in series, a configuration also referred to as ‘daisy chaining’.
Designed to match the UPS aesthetically. UPS up to around 30kVA have capacity for internal battery sets. Where this is not the case, or where additional power protection runtime is required, external battery extension cabinets or rackmount battery trays are used; as far as is reasonably practical, these are designed to match the UPS aesthetically.
An alternative is to use clad or unclad battery stands; this is more common for large UPS battery sets due to their size and weight. They can also provide better access for testing.
Few line-interactive UPS below 2kVA support extension packs. In terms of extended runtimes, few line-interactive UPS below 2kVA have the capability for external battery extension packs. Some 2kVA UPS, have a battery extension pack connector and can be used to support loads (without oversizing) for up to several hours. Others don’t, and must be oversized for the load at the UPS system design stage if longer runtime is required.
Major UPS manufacturers bring you a wealth of experience. Whether the answer to runtime requirements lies in UPS oversizing or the specification of UPS battery extension packs, one thing is certain. It is always best to deal with manufacturers of UPS equipment, such as Riello UPS, who have a wealth of experience as well as the range of battery extension products that can help users get the maximum battery runtime out of their UPS protection.
Robin Koffler is the co-author of The Power Protection Blog and the General Manager of Riello UPS Ltd, the UK subsidiary of Riello UPS (RPS S.p.A). For more information visit the Riello UPS – uninterruptible power supplies website.
And, of course, ebay is a great place to find items:
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Extended Run-Time12V 3000mA Battery for 12V Dewalt 2832K(Cordless Saws $55.99 |
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2 12V Drill Ni-Cd Extended Run-Time Battery For Dewalt DW9072 12V 12 v $76.98 |
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2 12V Drill Ni-Cd Extended Run-Time Battery for Dewalt DW9072 DC9071 $76.98 |
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Extended Run-Time Battery For Dewalt 2832K 2802K 2812K 2898K 1700mAh Ni-Cd Drill $40.99 |
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Extended Run-Time Battery For Dewalt DW970 DW979 DW980 DW981 1700mAh Ni-Cd Drill $40.99 |
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Extended Run-Time Battery For Dewalt DE9501 12V 12 volt 1700mAh Ni-Cd Drill $40.99 |
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Extended Run-Time Battery For Dewalt 152250-27 12 volt 1700mAh Ni-Cd Drill $40.99 |
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Extended Run-Time Battery For Dewalt 397745-01 12 volt 1700mAh Ni-Cd Drill $40.99 |
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2 x 12V Drill Ni-Cd Extended Run-Time Battery for Dewalt DE9037 DE9501 $63.98 |
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12V Drill Ni-Cd Extended Run-Time Battery For Dewalt DW9071 DW9072 DC9071 Tools $40.99 |
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2 Extended Runtime Battery For Ryobi 130224007 18V 1.5A $87.94 |
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2 Extended Runtime Battery For Ryobi 1322401 18V 18volt $87.94 |
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2 Extended Runtime Battery For Ryobi 130256001 18V 1.5A $87.94 |
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2 Extended Runtime Battery For Ryobi 1400672 18V 18volt $87.94 |
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Extended Run-Time Battery 1210 For 12V Makita 6011DW 6011D 5092DW 5092D 2000mAh $46.99 |
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12V Extended Run-time Battery Fit Ryobi 1400652 1400670 $39.99 |
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2 12V Drill Ni-Cd Extended Run-Time Battery for Dewalt DE9037 DE9501 $76.98 |
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12V Drill Ni-Cd Extended Run-Time Battery For Dewalt DC9071 Tools $40.99 |
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12V Drill Ni-Cd Extended Run-Time Battery For Dewalt DW9072 Tools $40.99 |
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12V Drill Ni-Cd Extended Run-Time Battery For Dewalt DW9071 Tools $40.99 |
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2 9.6V 3Ah Extended RunTime Battery Fit Makita 193889-4 $93.86 |
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2 Extended Run-Time Battery For 9.6V Makita 193889-4 $93.86 |
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Two 9.6V 3Ah Extended RunTime Battery For Makita 9033 $93.86 |
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Extended RunTime Battery Fit Dewalt DW9057 7.2V 3.0Ah Ni-MH $41.99 |
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DeWalt DS505K Extended Runtime Combo Kit $299.99 |
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Extended Run-Time Battery 1210 Fit 12V 12 volt Makita 6011DW 6011D 5092DW 5092D $46.99 |
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Extended Run-Time Battery For Makita 14.4V 3Ah 1434 $64.99 |
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Extended Run-time Battery for Dewalt DW9050 12V,2.4Amp $54.99 |
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Extended Run-Time Battery For Makita 9033 9034 6095D 6096D 9.6V 3Ah Ni-MH $51.99 |
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Extended Run-Time 9.6V 3Ah Ni-MH Battery For Makita 9033 9034 193889-4 Cordless $51.99 |
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Extended Run-Time Battery Fit Dewalt DW9062 9.6V,1.5Amp $32.99 |
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Extended Run-Time Battery For Dewalt DW9061 9.6V 1.50Amp $32.99 |
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Extended Run-Time Battery For Dewalt $32.99 |
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24volt Dewalt Batteries (Lot of Three) Professionally rebuilt EXTENDED RUNTIME $99.00 |
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Extended Run-time Battery Fit Dewalt cordelss DW9094 $43.99 |
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Extended Run-Time Tools Battery For 24V 3.0AH BOSCH BAT019 BAT021 Drills $111.99 |
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DeWALT DC9180C Charger and 18V NANO Li-Ion Battery Combo extended runtime New $100.00 |
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Black & Decker LBXR20 20-Volt MAX Extended Run Time Lithium-Ion Cordless Tool Ba $54.29 |
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Extended Run-Time Battery For Makita 14.4V 3Ah 1434 $64.83 |
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2X Extended Run-time Battery for Dewalt DW9050 12V,2.2A $86.98 |
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Extended Run-Time Battery For Dewalt DW9071 12V 12 volt $40.99 |
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Black and Decker LBXR20 20-Volt MAX Extended Run Time Lithium-Ion Cordless Tool $54.39 |
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12V 2.0AH Extended Run-time Battery Fit Ryobi 1400670 1400652 1400652b NEW $31.50 |
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Extended Run-time Battery for Dewalt DW9050 12V,2.2Amp $45.99 |
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Extended Run-time Battery Fit Dewalt DW9050,DW945 12V 2Ah 2AH 12V 12volt Ni-Cd $43.99 |
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DeWALT 14.4 V Extended Run -Time Battery # DW9091 & 7.2 -14.4V Charger # DW9118 $0.99 |
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2 Extended Run-time Battery Fit Dewalt DW9050 12V 2.4Ah Ni-Cd 12V 12volt new $104.98 |
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Two Extended Run-Time Battery For Dewalt DC9096 18V,3Ah DE9095 DW9095 DW9096 $115.98 |
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Two Extended Run-Time Battery For Dewalt DW9096 18V,3Ah DE9096, DE9503 DE9095 $115.98 |
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2 Extended RunTime Battery Fit Dewalt DW9061 9.6V 2.2Ah $80.98 |
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2 Extended RunTime Battery for 2.2A 24V Hitachi EB2430R $128.58 |
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2 Extended RunTime Battery for 24V Hitachi EB2430HA $128.58 |
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2 Extended RunTime Battery for 2.2AH 24V Hitachi 2433X $128.58 |
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2 Extended Run-Time Ni-MH Battery For 24V 3AH BOSCH BAT019 BAT021 Power Tools $205.98 |
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Two Extended Run-Time Ni-MH Battery For 24V 3.0AH BOSCH BAT019 BAT021 Drills $218.98 |
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Two Extended Run-Time Tools Battery For 24V 3.0AH BOSCH BAT019 BAT021 Drills $218.98 |
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2 Extended Run-Time Ni-MH Battery For 24V 3.0AH BOSCH BAT019 BAT021 Drills $218.98 |
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2 Extended Run-Time Tools Battery For 24V 3.0AH BOSCH BAT019 BAT021 Drills $218.98 |
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12V Extended Run-Time Battery For DeWALT DE9071 2.2Ah 2802K, 2812B, 2812K $49.99 |
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Extended RunTime Battery For Dewalt DW9057 DE9057 DW925K DW968K 7.2V 3.0Ah Ni-MH $41.22 |
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Extended RunTime Battery Fit Dewalt DW9057 DE9057 DE9085 7.2V 3.0Ah Ni-MH $41.22 |
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2 Extended RunTime Battery Fit Dewalt DW920K DW925K DW968K DW9057 7.2V 3.0Ah $77.44 |
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2 Extended RunTime Battery For Dewalt DW920K2 DW925K2 DW968K Tools 7.2V 3.0Ah $77.44 |
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2 Extended RunTime Battery For Dewalt DW920K-2 DW925K-2 DW968K Tools 7.2V 3.0Ah $77.44 |
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2 Extended RunTime Battery For Dewalt DW920K DW925K DW968K Tools 7.2V 3.0Ah $77.44 |
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2 Extended RunTime Battery For Dewalt DW9057 DE9057 DE9085 Tools 7.2V 3.0Ah $77.44 |
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2 Extended RunTime Battery Fit Dewalt DW9057 DE9057 DE9085 Tools 7.2V 3.0Ah $77.44 |
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2 Extended RunTime Battery for 2Ah 24V Hitachi EB 2430HA DV 24DVKS C 7D $144.98 |
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2 Extended RunTime Battery for 2A 24V Hitachi EB 2433X $144.98 |
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2 Extended RunTime Battery For 24V 24 volt Hitachi EB 2430R EB 2433X Ni-Cd $144.98 |
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2 Extended RunTime Battery For 24V 24 volt Hitachi EB 2430HA EB 2430R $144.98 |
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Extended Run-Time Battery For Dewalt DW9062 9.6V,2.0Amp $39.99 |
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Extended Run-Time Battery Fit Dewalt DW9062 9.6V,2.0Amp $39.99 |
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Extended Run-time Battery for Dewalt DW9050 12V,2.2Amp $45.99 |
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Extended RunTime Battery Fit Dewalt DW9062 9.6V,2.2Ah $42.99 |
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12V Extended Run-Time Battery For DeWALT DE9071 2.2Ah $49.99 |
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Extended Run-Time Battery Fit Dewalt DW9072 12V,2.2Amp $49.99 |
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12V 12volt 1.7AH Extended Run-Time Battery For Dewalt DW9071 DW9072 DC9071 Tools $40.99 |
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New DeWalt DW9061 9.6-Volt Extended Run-Time Battery $54.88 |
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12V Extended Run-time Battery Fit Ryobi 1400652 140067 $68.44 |
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18v Extended runtime battery rebuild Dewalt, Snap On,Craftsman all brands $49.50 |
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12V Drill Ni-Cd Extended Run-Time Battery For Dewalt DW9071 Tools $31.99 |
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12V Drill Ni-Cd Extended Run-Time Battery For Dewalt DC9071 Tools $31.99 |
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12V Drill Ni-Cd Extended Run-Time Battery For Dewalt DW9072 Tools $31.99 |
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2 x 12V Drill Ni-Cd Extended Run-Time Battery for Dewalt DE9037 DE9501 $63.98 |
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Extended RunTime Battery Fit Dewalt DW9057 7.2V 3.0Ah Ni-MH $32.99 |
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12V Extended Run-time Battery For Ryobi 1400652 140067 $68.44 |
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2 Extended Runtime Battery For Ryobi 1322401,1322705,1323303,1400672 18V 18 volt $87.94 |
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Extended Run-Time Battery For 18V Makita 3Ah 1834 6347D Makita 6300 Series $77.99 |
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NEW Extended Run-Time Battery For 18V Makita 3Ah 1834 6343D 6343DBE 6347D 6347D $77.99 |
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DEWALT Heavy-Duty XRP 18 Volt Battery Pack Extended Run Time DC9096 $47.87 |
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DEWALT Heavy-Duty XRP 18 Volt Battery Pack Extended Run Time DC9096 $43.67 |
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Extended Run-Time 9.6V 3Ah Ni-MH Battery For Makita 9033 9034 193889-4 Cordless $49.43 |
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Two 9.6V 3Ah Extended RunTime Battery For Makita 9033 0934 $93.86 |
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Two 9.6V 3Ah Ni-MH Extended Run-Time Battery For Makita 9033 9034 193889-4 $93.86 |
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Two 9.6V 3Ah Extended Run-Time Ni-MH Battery For Makita 9033 9034 6095D 6096D $93.86 |
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Extended Run-Time Battery For Makita 9033 9034 6095D 6096D 9.6V 3Ah Ni-MH $49.43 |
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2 Extended Run-Time Battery For Makita 9033 9034 9.6V 3Ah $93.86 |
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2 Extended Run-Time Battery For Makita 9033 9034 193889-4 9.6V 3Ah Ni-MH $93.86 |
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Extended Run-Time Battery 1210 Fit 12V 12 volt Makita 6011DW 6011D 5092DW 5092D $41.75 |
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