Source: SOLAS Chapter IV – Radiocommunications, Regulation 13 – Sources of energy.
Reference: imorules.com – SOLAS IV/13
Question 3 of 10
3. On a ship provided with an emergency source of electrical power that complies fully with all relevant provisions of regulation II-1/42 or 43, including the supply of power to the radio installations, the reserve source of energy must be capable of operating the required installations for a period of at least: