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Battery Sizing Calculation For Ups Application: Need Constant Power Discharge Characteristics Undersized

This document outlines the calculation for sizing batteries for a 200 KVA UPS system requiring a 10 minute backup time. It determines that a battery bank with 1 set of 150 Ah batteries across 35 blocks would be undersized based on the calculated minimum required capacity of 556.947925369 Ah. The calculations take into account factors like inverter efficiency, temperature, aging effects, and design margin to determine the appropriate battery sizing for the given UPS application and backup requirements.

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AamirMalik
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10K views2 pages

Battery Sizing Calculation For Ups Application: Need Constant Power Discharge Characteristics Undersized

This document outlines the calculation for sizing batteries for a 200 KVA UPS system requiring a 10 minute backup time. It determines that a battery bank with 1 set of 150 Ah batteries across 35 blocks would be undersized based on the calculated minimum required capacity of 556.947925369 Ah. The calculations take into account factors like inverter efficiency, temperature, aging effects, and design margin to determine the appropriate battery sizing for the given UPS application and backup requirements.

Uploaded by

AamirMalik
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as XLSX, PDF, TXT or read online on Scribd
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BATTERY SIZING CALCULATION FOR UPS APPLICATION

APPLICATION Back up for UPS


UPS RATING 200 KVA
POWER FACTOR 0.8
BACKUP TIME 10 min
INVERTER EFFICIENCY 95% (Considered)
MINIMUM DC VOLTAGE 357 V DC (Considered)
MAXIMUM DC VOLTAGE 454 V DC (Considered)
END CELL VOLTAGE 1.80 Volts/cell (Considered)
NO. OF CELLS 384 cells
MAXIMUM CHARGING VOLTAGE PER CELL 2.30 Volts/cell (Considered)
DESIGN MARGIN 1
AGEING FACTOR 0.8
TEMPERATURE CORRECTION FACTOR 1 (For 25 Deg Celcius)

Watts/Cell = KVA x 1000 x P.F


No.Of Cells X Inverter Efficiency

Watts/Cell = 200 x 1000 x 0.8


384 x 0.95

Watts/Cell = 438.59649122807

Watts/Cell [With Factor] = 438.596 x Aging Factor x Design Margin x


Temp.Derating

Watts/Cell [With Factor] = 548.245614035088


Watts/Battery [With Factor] = 3289.47
Need Constant Power Discharge
Characteristics
BATTERY OFFERED: -
1 Sets of 150 Ah, 35 blocks for 30 min back up- UNDERSIZED
Idc = KVA x 1000 x P.F
No.Of Cells X ECV X Inverter
Efficiencyx No. Of Battery

Idc = 445.5583403 Ah

Idc [With Factor] = 556.947925369

Qanta Catalogue 12AL150 delivers 148 Ah for 30 mins upt 1.70 ECV,
which is less than Idc = 176.91 Ah. Therefore, undersized battery bank.

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