PSC deficiency code 05114: Reserve source of energy

Area 05 Radio communications

Code 05114 covers the reserve source of energy for the radio installation, on almost every ship a bank of batteries with its own charger. It has to run the GMDSS equipment for distress and safety traffic when both the main and the emergency switchboards are dead. The inspector writing this code doubts the batteries would carry the radios for the time the rules require.

What the inspector looks at

The officer often has the GMDSS console switched to battery.

  • the changeover, and whether the VHF and the MF/HF or satellite equipment keep working on battery
  • battery voltage with the charger on and off
  • the charger: alarms, fault lamps, automatic charging after a discharge
  • the battery space: ventilation clear, batteries secured, terminals clean, no leaking electrolyte
  • for vented lead-acid batteries, electrolyte level and specific gravity readings
  • the record of the annual capacity check and the routine battery checks in the radio log

Common findings

  • GMDSS batteries capacity test not carried out
  • Batteries not holding charge, voltage low
  • Battery charger faulty, alarm on GMDSS panel
  • Battery room ventilation blocked
  • Battery terminals heavily corroded
  • Electrolyte level low, no specific gravity records
  • Radio equipment not operating on reserve source

The rule behind it

SOLAS chapter IV, regulation 13 sets the sources of energy for radio installations. The reserve source must be independent of the propulsion power and the ship's electrical system, and able to run the VHF installation together with the MF, MF/HF or ship earth station installation for the sea area. Its capacity is one hour if the emergency source of power fully meets SOLAS chapter II-1 (regulation 42 or 43), including supply to the radio installation, and six hours if it doesn't. For rechargeable batteries, regulation 13 also requires an automatic charger able to restore minimum capacity within 10 hours, and a capacity check at intervals not exceeding 12 months while the ship is not at sea.

Action codes you are likely to see

Cleaning terminals or clearing a blocked vent during the inspection can be marked 10. A missing capacity check or a faulty charger usually gets 17. The reserve source isn't named as such on the IMO list of detainable deficiencies. The list does include failure of the radio equipment for distress and safety communication, and an officer may treat batteries that can't run that equipment as a ground for detention (30) under that heading. See action taken codes.

How to close it

Run the capacity check, by a discharge test or another method the maker and flag accept, and record the result. Replace batteries that fail it, and have a technician repair a charger that doesn't recharge automatically. Keep the test record, battery invoice or technician's report, and a radio log entry showing the installation working on battery, with the Form B. Related: emergency generator, satellite EPIRB and other radiocommunication findings.

Questions

How long must GMDSS batteries last?

One hour if the ship's emergency source of electrical power fully meets SOLAS and also supplies the radio installation, otherwise six hours.

How often must the GMDSS battery capacity be checked?

SOLAS requires a check at intervals not exceeding 12 months, when the ship is not at sea. Many ships do a discharge test in port and record the voltage over time.

Is the reserve source the same as the emergency generator?

No. The emergency generator is the ship's emergency source of electrical power under SOLAS chapter II-1 and has its own deficiency code. The reserve source of energy is the separate supply for the radio installation, used when both the main and emergency sources have failed.

Sources

Written by the SuperRonin team from the sources above. Last updated 6 Nov 2026. This page explains the rules; the regulation, the PSC officer and your flag and class have the final word. If something here doesn't match what you see on board, write to [email protected] and we'll correct it.

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