9Appendix

9.1Samples for battery calculation

9.1.1Typical Installation

GMDSS Battery size calculation for 1 hour (Battery size calculation based on the IMO regulations Chapter IV - Reg.13)

Ship Name

 

QMIII

 

 

 

Battery capacity

230Ah

 

 

 

Battery Type

 

2x (12V / 135)

 

 

 

 

 

 

Area A1, A2, A3

 

 

 

 

 

 

Battery located in battery chest on observation deck

Pos

Qty.

 

Equipment

I-max

I-standby

Total (A)

 

 

 

 

(A)

(A)

(I-max/2 + I-standby)*Qty.)

1

1

Skanti TRP 8751D Radiotelephone

45,00

3,00

25,50

2

1

Debeg 3818 DSC Controller

 

0,21

0,21

3

2

T&T 3020 Inmarsat-C Transceiver

3,20

0,40

4,00

4

2

Inmarsat-C Monitor

 

0,85

1,70

5

2

Inmarsat-C Printer

1,00

0,20

1,40

6

1

CI 8501 Navtex Receiver

 

0,50

0,50

7

2

Skanti USE 300 VHF Radiotel.

2,80

0,05

2,90

8

2

Debeg 3817 VHF DSC Controller

 

0,21

0,42

9

1

Sailor RT2047 VHF Radio Tel.

6,50

1,00

4,25

10

1

Simrad GN 33 GPS

 

0,63

0,63

11

1

Koden KGP 900 GPS

4,00

0,63

2,63

12

1

Koden LR 771 Loran C

 

0,42

 

13

1

Emergency light

 

2,00

2,00

14

1

AIS NAUTICAST™ Inland AIS

7,00

0,75

0,84

 

 

 

 

 

Total

46,98

K1 partly discharged battery

K1-30°

K5

= Total consumption x 1,25 =58,73 Ah

= K1 x 1 / 0,30

106,78 Ah

=K1-30° / 0,65

164,28 Ah

Selected Battery (K5) =

230,00 Ah

K1 partly discharged battery =

correction factor taking care that the battery might not be fully charged (we assume that in worst case the battery is only at 80% fully charged)

K1-30° =

correction factor taking care that the battery may be used at ambient temperature of - 30 degress

(at -30 degrees the battery has only 30% of nominal capacity)

K5 = correction factor taking care of that the battery is defined by manufacturer for 5 hours discharge time Calculation for AIS =

transmit pulse length 26,6ms with a maximum repetition rate of 2 seconds results in a maximum of 30 pulses/minute 1800 pulses/hour x 26,6 ms 47880 ms 47,88 seconds transmit time during one hour 47,88 seconds 0,8 minutes 0,0133 hours transmitting time during one hour operation

Up-Rounded to 0,02 hrs transmitting time

Above mentioned calculation assumes that all equipment is in operation which is normally not valid, that means that the actual consumption is lower.

Y1-03-0212-1 Rev D

57

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ACR Electronics Y1-03-0212-1 manual Appendix Samples for battery calculation, Typical Installation, 230,00 Ah