ACR Electronics 2662 - Manual (Page 59)

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 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.
Y1-03-0212H 55