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Stationary Ni-Cd Battery Sizing: Sizing After Charge at Constant Current

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Dileep Reddy

1) The document provides sizing specifications for a stationary nickel-cadmium battery system to support a new project called "New Project 1". 2) It is proposed to use one 173-cell KPM 1200P battery with a rated capacity of 1200 Ah. 3) A warning is given that the battery sizing was done after full charge at constant current and does not include floating effect, as specified in the IEEE standard.

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Stationary Ni-Cd Battery Sizing: Sizing After Charge at Constant Current

Uploaded by

Dileep Reddy
180 views4 pages
1) The document provides sizing specifications for a stationary nickel-cadmium battery system to support a new project called "New Project 1". 2) It is proposed to use one 173-cell KPM 1200P battery with a rated capacity of 1200 Ah. 3) A warning is given that the battery sizing was done after full charge at constant current and does not include floating effect, as specified in the IEEE standard.

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1) The document provides sizing specifications for a stationary nickel-cadmium battery system to support a new project called "New Project 1". 2) It is proposed to use one 173-cell KPM 1200P battery with a rated capacity of 1200 Ah. 3) A warning is given that the battery sizing was done after full charge at constant current and does not include floating effect, as specified in the IEEE standard.

Copyright:

© All Rights Reserved
Download as PDF, TXT or read online from Scribd
Download as pdf or txt
180 views4 pages

Stationary Ni-Cd Battery Sizing: Sizing After Charge at Constant Current

Uploaded by

Dileep Reddy
1) The document provides sizing specifications for a stationary nickel-cadmium battery system to support a new project called "New Project 1". 2) It is proposed to use one 173-cell KPM 1200P battery with a rated capacity of 1200 Ah. 3) A warning is given that the battery sizing was done after full charge at constant current and does not include floating effect, as specified in the IEEE standard.

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© All Rights Reserved
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Friday, April 24, 2020

Stationary Ni-Cd battery sizing


Sizing after charge at constant current

project name New Project 1


project reference P_24Apr20_Dileep_a
System name SYS_00001 - IEEE/UPS
System reference SYS_00001
Customer
Customer reference

Battery proposal

Proposed battery 1 x 173 x KPM 1200P

Electrical data Rated capacity 1200 Ah


Fast charge voltage 252.58 V (1.46 V/cell)
Floating charge voltage 242.2 V (1.4 V/cell)
Final voltage/cell 1.14 V
Short-circuit current 23,348 A
Topping-up interval 12.5 years

Physical data Battery weight 11,591.0 Kg

Warning: The proposed battery solution has been sized after full charge at constant current and does not include
floating effect as specified in the IEEE 1115-2000 sizing standard.

Technical specifications

Sizing method I

Minimum system voltage 197.22 V


Voltage window
Maximum system voltage 252.58 V
Number of cells 173
End voltage per cell 1.14 V

Charge method Dual rate

Load profile Time


Number Current
(hh:mm:ss)
1 1400 A 00:01:00
2 131.5 A 00:58:00
3 145.64 A 00:01:00
Options Nominal temperature 20 °C
Minimum temperature 0 °C
Maximum temperature 50 °C
Design margin 1.1
Aging factor 1.25

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(376241) Version: 2.9, Last updated on 02/2020 P 1/4
Friday, April 24, 2020

Stationary Ni-Cd battery sizing


Sizing after charge at constant current

Load profile

Amperes

Minutes

Visit our website at www.amcosaft.in


(376241) Version: 2.9, Last updated on 02/2020 P 2/4
Friday, April 24, 2020

Stationary Ni-Cd battery sizing


Sizing after charge at constant current

Battery calculation worksheet


Range KPM
No. of cells 173
Final voltage/cell 1.14 V
Nominal temperature 20 °C
Minimum temperature 0 °C
Maximum temperature 50 °C

(7) (8)
(3) (4)
(2) (5) Temp Required
(1) Changes in Duration of (6)
Load End of Section Derating Section Size
Period Load Period Kt Factor
(Amperes) (minutes) Factor (3)x(6)x(7)
(Amperes) (minutes)
** =Rated Ah
Section 1 - First 1 Periods Only - If A2>A1, go to Section 2-No
A1-0=
1 A1=1,400.00 M1=1.00 t=M1=1.00 0.4868 1.2738 868.12
1,400.00
Total 868.12
Section 2 - First 2 Periods Only - If A3>A2, go to Section 3-Yes

Section 3 - First 3 Periods Only - If A4>A3, go to Section 4-No


A1-0= t=M1+...
1 A1=1,400.00 M1=1.00 1.6238 1.1494 2,612.95
1,400.00 +M3=60.00
A2-A1=
2 A2=131.50 M2=58.00 t=M2+M3=59.00 1.6100 1.1509 -2,350.47
-1,268.50
A3-A2=
3 A3=145.64 M3=1.00 t=M3=1.00 0.4868 1.2738 8.77
14.14
Total 271.25

Maximum Section size 868.12 + Random size 0.00 = Uncorrected Size 868.12.
Uncorrected Size 868.12 x Design margin 1.1 x Aging factor 1.25 = 1,193.67.
When the cell size is greater than a standard cell size, the next larger cell is required.
The Required cell size is 1,193.67 Amperes-hours. Therefore cell KPM 1200P is required.
The Kt factor is a way to present the performance of a cell.
Kt=Nominal capacity (Ah)/Performance (A)
It is valid for a specific cell type, discharge time and final voltage.

Temperature compensated charge voltage


Not mandatory. If used the value to apply is -3 mV/°C (-1.7 mV/°F) starting from +20°C to +25°C (+68°F to +77°F).

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(376241) Version: 2.9, Last updated on 02/2020 P 3/4
Friday, April 24, 2020

Stationary Ni-Cd battery sizing


Sizing after charge at constant current

Storage
Store the battery indoors in a dry, clean, cool location (0°C to +30°C / +32°F to+ 86°F) and well ventilated space.
Do not store in direct sunlight or expose to excessive heat.
Cells filled and charged
• If cells are stored filled, they must be fully charged prior to storage.
• Cells may be stored filled and charged for a period not exceeding 12 months from date of dispatch from factory. Storage of
a filled battery at temperatures above +30°C (+86°F) can result in loss of capacity. This can be as much 5% per 10°C (18°F)
above +30°C (+86°F) per year.
Cells empty and discharged
• The cells are recommended to be stored empty and discharged.
• Cells can be stored like this for many years.
For cells operated below -20° C a higher gravity electrolyte is normally required, please check product information or contact
your local representative for guidance.

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(376241) Version: 2.9, Last updated on 02/2020 P 4/4

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