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9 Appendix
9.1 Samples for battery calculation
9.1.1 Typical 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.
1
1
Skanti TRP 8751D Radiotelephone
2
1
Debeg 3818 DSC Controller
3
2
T&T 3020 Inmarsat-C Transceiver
4
2
Inmarsat-C Monitor
5
2
Inmarsat-C Printer
6
1
CI 8501 Navtex Receiver
7
2
Skanti USE 300 VHF Radiotel.
8
2
Debeg 3817 VHF DSC Controller
9
1
Sailor RT2047 VHF Radio Tel.
10
1
Simrad GN 33 GPS
11
1
Koden KGP 900 GPS
12
1
Koden LR 771 Loran C
13
1
Emergency light
14
1
AIS Nauticast
K1
= Total consumption x 1,25 =
partly discharged battery
K1
= K1 x 1 / 0,30
-30°
K5
=K1
-30°
Selected Battery (K5) =
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.
Installation Manual
Equipment
I-
max
(A)
45,00
3,20
1,00
2,80
6,50
4,00
7,00
58,73 Ah
106,78 Ah
164,28 Ah
/ 0,65
230,00 Ah
48
I
Total (A)
-standby
(A)
(I
/2 + I
)*Qty.)
-max
-standby
3,00
0,21
0,40
0,85
0,20
0,50
0,05
0,21
1,00
0,63
0,63
0,42
2,00
0,75
Total
25,50
0,21
4,00
1,70
1,40
0,50
2,90
0,42
4,25
0,63
2,63
2,00
0,84
46,98
Y1-03-0204 Rev.K
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