Check reserve-source battery capacity for VHF / MF-HF radio and EPIRB per SOLAS IV Reg. 13 - minimum 6 h (or 1 h if ship has emergency generator running > 36 h).
Formula
$$ C_{Ah,req} = \frac{I \cdot t}{k_{T}} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $I$ | Reserve load | A | GMDSS equipment list |
| $t$ | Required autonomy | h | SOLAS IV Reg.13 |
| $k_T$ | Temperature de-rating | - | battery maker |
Sources
- SOLAS IV Reg. 13.