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Installation Manual 48 Y1-03-0204 Rev.J

GMDSS Reserve Battery Calculation (24 V DC)

for Raytheon Marine GmbH GMDSS Compact-Console Area A3 with 400 W MF/HF

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 18.75 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 RM 808 AIS 5.0 A 1,0A

Emergency Light 2,5 A

Total 41.75 A 8,1 A 2.5 A

Calculation:

Case A:

1h x ( 0.5 I TX + I RX + I Add ) x 1.4 = 44.06 Ah

recommend battery capacity is 86 Ah

Charger:

I Charg 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 = 264.39 Ah

The battery calculation should not be used for uninterruptible power supply (UPS)

configuration

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ACR Electronics Nauticast 2625 Installationshandbuch Seite 52