Electric Galley, Laundry and Watermaker Lithium Configurations

These are the loads that separate a comfortable cruising system from a genuine liveaboard energy system. They share a characteristic that makes them easy to misjudge: high peak power for short periods, which drives inverter and BMS sizing far more than it drives bank capacity.

Four configurations

Starting ranges to investigate, not recommendations.

Configuration	Daily energy	Battery bank	Solar
Induction, microwave, kettle, toaster, coffee, refrigeration	1.5–4 kWh attributable to galley use	8–15 kWh for a serious liveaboard setup	1,200–2,000W plus strong backup charging
Compact washing machine plus normal loads	Add roughly 0.3–1.5 kWh per wash	6–12 kWh or larger depending on other loads	1,000W plus
Watermaker, 12V, 24V or AC	Commonly 0.3–2.0 kWh depending on litres produced	5–12 kWh	800–1,500W plus
Induction + laundry + 24-hour Starlink	5–9 kWh/day before air conditioning	10–18 kWh	1,500–2,500W plus controlled engine or generator charging

Electric cooking

Electric cooking creates high peak loads that may run for only short periods. The inverter and BMS therefore need enough power capacity even when daily kWh remains moderate. Staggering kettle, microwave and induction use avoids unnecessary inverter oversizing — a habit change that can save thousands of dollars of hardware.

Laundry

A cold-water wash is dramatically easier on the electrical system than electrically heating wash water. Where possible, run laundry during strong solar or during engine or generator charging, so the load is supported by generation in real time rather than drawn from the bank.

Watermakers

Compare watermakers in watt-hours per litre, not pump wattage. A larger unit that produces water quickly can use less energy per litre than a small unit running for many hours, and it gives you the option of making water when generation is strongest.

The combined liveaboard profile

Induction cooking, regular laundry and continuous communications together represent a realistic modern liveaboard. Schedule the largest flexible loads when solar production is strongest, and use the battery mainly to bridge between generation periods rather than to carry the whole day.

Peak current, not just capacity

For every appliance in this group, check the DC current the bank must supply, not only the energy consumed. A 3,000W inverter on a 12V system can require well over 250A once losses are counted. That figure — not the kWh figure — determines the BMS rating, cable size, busbar rating and fuse selection.

Configuration logic

Start with a 24-hour load table. Separate loads into continuous, short high-power, and critical groups. Then model at least one poor-generation day and decide how much reserve should remain.

Questions to ask

1. Can the BMS support the largest simultaneous load, and its peak as well as continuous rating?
2. Can the charging system replace a normal day's energy?
3. What happens after one cloudy or rainy day?
4. Which loads can be delayed until strong solar is available?
5. Is the inverter sized for genuine simultaneous use, or for every appliance at once?
6. Can the engine still start independently?