Shore Power Charging for Marine Lithium Batteries
Understand lithium shore charging, charger profiles, inverter-chargers, marina power and AC safety on Australian boats.
Check charger profile, maximum DC charge current, BMS compatibility, remote enable/disable, temperature behaviour, AC input current, generator compatibility and communication with the battery system.
Charge-time estimate
Charge time = energy to replace / effective charge power
If 4kWh must be replaced and the charger can sustain 1.5kW into the battery:
4 / 1.5 = 2.7 hours
Real charging usually takes longer because system loads, charger limits and battery controls continue operating.
AC safety
Shore-power wiring, RCD protection, earthing, galvanic issues, inverter transfer switching and neutral-earth arrangements are not DIY details to copy from a house diagram.
Use appropriate marine electrical design and qualified electrical work where required.
Check the whole charging path
A charger setting is only one part of the result. On the boat, charging performance depends on the source, regulator, cable path, temperature, battery limits and what happens when the BMS asks the source to stop.
- Record sustained output after the alternator, controller or charger is hot—not only its nameplate rating.
- Verify voltage limits, temperature sensing and shutdown behaviour against the battery manufacturer’s instructions.
- Compare daily energy used with energy that can realistically be replaced in the available charging window.