Batteries & Energy Storage on Ships
Lead-Acid, Lithium-Ion, and Why Stored Energy Is a Fire Waiting for a Trigger Introduction — batteries don’t fail gently Batteries onboard ships are no longer limited to small UPS banks. Modern vessels carry: These systems store enormous energy in confined spaces. When something goes wrong, the failure is rarely electrical alone — it becomes thermal, […]
UPS Systems on Ships
Why “Emergency Power Available” Is Not the Same as “Emergency Power Useful” Introduction — UPS failures don’t look dramatic, but they end ships’ options Uninterruptible Power Supplies on ships are assumed to be invisible heroes. They sit quietly behind navigation equipment, control systems, communication racks, DP consoles, and automation cabinets. When they work, nobody notices. […]
Thrusters on Ships
High Inertia Loads, Drive Trips, and Why Position Is Lost in Seconds Introduction — thrusters fail when ships need them most Thrusters are high-power, high-inertia electrical loads used during: They operate precisely when: Thrusters are therefore one of the highest-risk electrical consumers on board. Why thrusters are uniquely stressful electrically Thruster systems combine: Starting, stopping, […]
Electric Propulsion on Ships
Why Power Electronics Decide Whether a Ship Can Move at All Introduction — propulsion is no longer mechanical On electrically propelled ships, propulsion is not a shaft connected to a diesel engine. It is a control problem, an electrical stability problem, and a power electronics problem. When propulsion is electric, torque exists only as long […]
Motor Starting Methods on Ships
DOL, Soft Starters & VFDs — Why Starting Philosophy Shapes Blackout Risk Introduction — starting a motor is when ships lose control Most electrical disturbances on ships occur during motor starting, not steady operation. Starting draws high current, collapses voltage, stresses generators, and exposes weaknesses in PMS coordination. Starting philosophy determines whether: Poor starting decisions […]
Electric Motors on Ships
How Induction Motors Actually Fail — and Why Protection Often Comes Too Late Introduction — motors are the workhorses that quietly decide survivability Electric motors drive almost everything that keeps a ship alive: cooling water pumps, lubricating oil pumps, steering gear auxiliaries, ballast systems, ventilation fans, cargo gear, and thrusters. When a motor fails, the […]
Rectifiers & Inverters
6-Pulse, 12-Pulse, AFE — Harmonics, Heat, and System Instability Introduction — DC systems destabilise AC ships Rectifiers and inverters sit at the boundary between AC and DC systems. They are essential for: They are also one of the largest sources of harmonic pollution onboard. Many “mysterious” voltage problems start here. Rectifier basics — what pulse […]
Marine Transformers
Voltage Conversion, Fault Containment, and Why Fires Start Quietly Introduction — transformers rarely trip, they just burn On ships, transformers are often treated as passive, reliable components. They have no moving parts, make little noise, and usually sit untouched for years. This is precisely why they are dangerous. Transformers fail silently: When a transformer finally […]
Energy Management on Ships
Efficiency, Stability, and Why “Saving Fuel” Can Create Blackouts Introduction — efficiency without context destroys resilience Modern ships are under intense pressure to: Energy management systems promise optimisation. But efficiency-driven operation can quietly erase redundancy, leaving ships fragile under disturbance. Many blackouts occur not because power was unavailable — but because it was intentionally minimised. […]
Shore Power / Cold Ironing
Why Plugging In Is One of the Highest-Risk Electrical Operations on a Ship Introduction — shore power looks simple until it isn’t Cold ironing is often presented as a clean, environmentally friendly upgrade: shut down generators, connect shore power, reduce emissions. In practice, shore connection is one of the most technically complex and failure-prone power […]