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Y1-03-0212-1 Rev D 57
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.
Equipment
I-max
(A)
I-standby
(A)
Total (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
= Total consumption x 1,25 =58,73 Ah
K1
-30°
= K1 x 1 / 0,30 106,78 Ah
K5 =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.