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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
AIS NAUTICAST™ Inland AIS
14
1
K1
= Total consumption x 1,25 =
partly discharged battery
K1
= K1 x 1 / 0,30
-30°
K5
=K1
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.
Y1-03-0212-1 Rev D
Equipment
106,78 Ah
164,28 Ah
/ 0,65
-30°
230,00 Ah
I-
I
Total (A)
max
-standby
(A)
(A)
(I
-max
45,00
3,00
0,21
3,20
0,40
0,85
1,00
0,20
0,50
2,80
0,05
0,21
6,50
1,00
0,63
4,00
0,63
0,42
2,00
7,00
0,75
Total
58,73 Ah
/2 + I
)*Qty.)
-standby
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
57
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