Batteries keep going flat
We assess battery condition, charging sources, standing loads and whether capacity suits the boat.
Fault finding · repair · upgrades
Marine electrical diagnostics, done methodically.
We diagnose the complete system rather than simply replacing parts-then explain what is wrong and the practical route to fixing it.
Marine electricians on the River Hamble
Find the cause, not just the symptom.
Intermittent faults, flat batteries and unreliable charging can have more than one cause. Knight Marine checks the connected system: generation, storage, distribution, loads, configuration and data connections.
From our base at Universal Marina, we support boats in Hamble, Southampton and across the Solent with fault finding, repairs, rewiring and planned marine electrical upgrades.
What we can diagnose.
- Batteries that discharge unexpectedly
- Alternators and DC-DC charging
- Shore chargers and shore-power faults
- Solar charging and regulator performance
- Inverters and inverter/chargers
- Battery monitors and incorrect readings
- DC loads, cabling, protection and connections
- Charging profiles and system configuration
- NMEA networks, sensors and instrument data
- Intermittent electrical and electronics faults
Repair, upgrade or refit.
Once the fault is understood, we can complete the repair or help plan the next stage. That might mean correcting a connection, replacing unsuitable cabling, updating charging equipment or designing a wider onboard power upgrade.
Common symptoms
When to ask for a system check.
These symptoms can point to a component fault, poor configuration, a connection problem or a wider system-design issue.
Shore power is not charging
We check supply, protection, chargers, connections and the configuration between AC and DC systems.
Alternator charging is poor
We investigate alternator output, regulation, cabling, battery acceptance and DC-DC charging.
Electronics switch off
Voltage drop, weak connections, undersized cabling or distribution faults can interrupt sensitive equipment.
Monitor readings look wrong
Battery monitors depend on correct wiring, configuration, synchronisation and complete load measurement.
Network faults are intermittent
We inspect power, termination, connectors, sensors and NMEA data flow before replacing equipment.
Related expertise
One team for the connected system.
01
Onboard power
Lithium, inverter/chargers, solar, alternator charging and remote monitoring.
Explore power systems02
Navigation systems
Navigation, radar, AIS, autopilots, communications and onboard networks.
Explore navigation systems03
Calibration
Instrument setup, sensor calibration, autopilot tuning and sea-trial commissioning.
Explore calibration