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Radio/EPIRB Battery - 6 h Autonomy

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Formula, assumptions, and limits

CAh,req=ItkTC_{Ah,req} = \frac{I \cdot t}{k_{T}}
SymbolMeaningUnit
IIReserve loadA
ttRequired autonomyh
kTk_TTemperature de-rating

Source: SOLAS IV Reg. 13

In short

Check reserve-source battery capacity for VHF / MF-HF radio and EPIRB per SOLAS IV Reg.

Learn the theory LSA Code: International Life-Saving Appliance Code