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ALCAD Battery Size Calculation

This document provides a battery sizing proposal and technical specifications for a stationary nickel-cadmium battery. The proposed battery consists of 1 unit containing 96 cells of type MC110P, with a rated capacity of 110 Ah. The load profile consists of a 40A load for 59 minutes followed by a 140A load for 1 minute. Calculations using the IEEE 1115 sizing method determine that a 106.17 Ah battery is required, so a 110 Ah MC110P cell is recommended.

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2K views3 pages

ALCAD Battery Size Calculation

This document provides a battery sizing proposal and technical specifications for a stationary nickel-cadmium battery. The proposed battery consists of 1 unit containing 96 cells of type MC110P, with a rated capacity of 110 Ah. The load profile consists of a 40A load for 59 minutes followed by a 140A load for 1 minute. Calculations using the IEEE 1115 sizing method determine that a 106.17 Ah battery is required, so a 110 Ah MC110P cell is recommended.

Uploaded by

mrtabieh
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Date : 06/01/2011

Stationary NiCd battery sizing

Battery proposal
Proposed battery 1 x 96 x MC110P

Electrical data Rated capacity 110 Ah


Fast charge voltage 139.20 V
Floating charge voltage 134.40 V
Final voltage/cell 1.000 V
Short-circuit current 1862 A
Topping-up interval 4.0 Years

Physical data Battery weight 693.1 kg

Technical specifications
Sizing method IEEE I

Voltage window Minimum system voltage 96.00 V


Maximum system voltage 140.00 V
Nominal system voltage 125.00 V

Charge method Dual rate

Load profile Current / Power Time(hh:mm:ss)


1 40.00 A 0:59:00
2 140.00 A 0:01:00

Options Nominal temperature 20 °C


Minimum temperature 5 °C
Maximum temperature 40 °C
Design margin 1
Aging factor 1

This document becomes contractual only after written confirmation


V4.4 06/07 Visit our website alcad.com
Date : 06/01/2011

Stationary NiCd battery sizing


Load profile

Amperes
140

120

100

80

60

40

20

0
00mn 10mn 20mn 30mn 40mn 50mn 60mn

This document becomes contractual only after written confirmation


V4.4 06/07 Visit our website alcad.com
Date : 06/01/2011

Battery calculation worksheet


IEEE 1115

Range : MC
No. of cells : 96
Final voltage/cell : 1.000 V
Nominal temperature : 20.0°C
Minimum temperature : 5.0°C
Maximum temperature : 40.0°C

(1) (2) (3) (4) (5) (6) (7) (8)


Period Load Changes Duration End Kt Temp Required
(Amperes) in of of Factor * Derating Section
Load Period Section Factor Size
(Amperes) (minutes) (minutes) (3)x(6)x(7)
=Rated Ah

Section 1 - First 1 Periods Only - If A2 > A1, go to Section 2 - Yes


Section 2 - First 2 Periods Only - If A3 > A2, go to Section 3 - No
1 A1=40.00 A1-0=40.00 M1=59.00 t=M1+M2=60.00 1.34 1.13 60.26
2 A2=140.00 A2-A1=100.00 M2=1.00 t=M2=1.00 0.37 1.23 45.91
Total 106.17
Random Equipment Load Only (if needed)
R AR= AR-0= MR= t=MR= 0.00
(*) In this calculation, constant potential charging effects are included in our Kt factors

Maximum Section Size 106.17 + Random Size 0.00 = Uncorrected Size 106.17
Uncorrected Size 106.17 x Design Margin 1.00 x Aging Factor 1.00 = 106.17
When the cell size is greater than a standard cell size, the next larger cell is required.
The required cell size is 106.17 Amperes-hours. Therefore cell MC110P is required

This document becomes contractual only after written confirmation


V4.4 06/07 Visit our website alcad.com

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