Installation Manual Nauticast V1.0.3

Sample for battery calculation
GMDSS Reserve Battery Calculation ( 24 V DC )
According to IMO Regulation COMSAR/Circ.16 4. March 1998
A: with Emergency Generator ( SOLAS IV 13.2 )
The GMDSS equipment shall be able to operate one (1) hour on reserve power
With 50% of time in transmission mode and 50% in receiving mode.
B: without Emergency Generator ( SOLAS IV 13.2 )
The GMDSS equipment shall be able to operate six (6) hours on reserve power
with 50% of time in transmission mode and 50 % of receiving mode.
Equipment Type Transmitting Receiving Additional
MF/HF STR 2000 R 15 A 4 A incl.DSC
Inmarsat C STR 1500 CN 5 A 1,8 A incl.EGC
VHF 1 with DSC VHF1000DSC 6,5 A 0,65 A incl.DSC
VHF 2 with DSC VHF1000DSC 6,5 A 0,65 A incl.DSC
AIS AIS - Unit 5,0 A 1,0 A
Emergency Light 2,5 A
Total 38 A 8,1 A 2.5 A
Calculation:
Case A:
1h x ( 0.5 I TX + I RX + I Add ) x 1.4 = 41.44 Ah
recommend battery capacity is 86 Ah
Charger:
I Charge x 0.1 I Batt/h = 8.6 A
recommend charger is type 20 A
Case B:
6h x ( 0.5 I TX + I RX + I Add ) x 1.4 = 248.66 Ah
The battery calculation should not be used for uninterruptible power supply (UPS)
configuration