A 12V marine desalination unit is one of the simplest ways to produce freshwater on smaller boats without a generator. Here’s how they work and what you can realistically expect on the water.
How Reverse Osmosis Works
All portable watermakers follow this sequence:
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A high-pressure pump draws seawater.
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The pump forces water through a reverse osmosis membrane.
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Salt is rejected.
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Freshwater flows into your tank.
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Brine is discharged back overboard.
The process is simple, reliable, and ideal for small boats with limited power.
Real-World Power Draw
A typical 12V unit draws 10–25 amps, depending on design.
This pairs well with:
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Solar setups
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AGM or lithium house batteries
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Alternator charging
A system like the Scout SW20 is designed specifically for this power profile.
https://lediwatermaker.com/products/scout-sw20
Water Output Expectations
Factors influencing output include:
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Water temperature
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Membrane health
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Pump efficiency
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Salinity levels
Expect ~20 L/hr from compact 12V systems in warm Australian water.
Noise, Heat, and Durability
Quality units minimise pump noise and vibration. Look for stainless steel pumps and marine-rated seals — essential for long-term reliability.
When to Choose a 12V Unit
Choose 12V desalination if you want:
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No generator requirement
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Low power consumption
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Lightweight gear
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Portable freshwater production
FAQ
Can I run a 12V watermaker on solar only?
Yes, with sufficient panel and battery capacity.
How often should I flush the membrane?
After every use for best longevity.
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