Who Needs a 12V Watermaker?

Seacraft's 12V range runs directly from your existing 12V (or 24V) battery bank: SCW-30 (30 L/hour) and SCW-50 (50–60 L/hour). No generator or shore power is required — which is why cruisers who anchor independently look at this segment first.

12V is not right for every boat. Daily water need, crew size and battery capacity must be assessed together. Compare power supply in our 12V vs 230V guide and models in SCW-30 vs SCW-50.

12V Fit Checklist

12V/24V battery system only
No generator, or rarely used
Daily need around 200 L or less
Small–mid sailboat or RIB profile

When Does a 12V Watermaker Make Sense?

Based on our product selection guide and product pages:

Power infrastructure

Battery bank only — no 230V generator or regular marina shore power. The unit runs from batteries at anchor. Powering a 230V model through an inverter drains batteries quickly; the 12V range is built for this scenario.

Cruising style

Bay hopping, long anchoring, independence from marina water. Engine alternator charging or solar can supplement — solar panel guide.

Consumption level

Small–medium crew; daily need met in a few hours on SCW-30 or SCW-50. Use our capacity guide to calculate.

Which Boat Profiles Fit the 12V Segment?

Profile	Typical length	Seacraft 12V direction	Source
Small sailboat, RIB, boat camper	≤10 m	SCW-30	SCW-30 product page
Small sailboat / tender	8–15 m	SCW-30, SCW-50	Product selection guide
Mid-size sailboat, small motor yacht	10–14 m	SCW-50	SCW-50 product page
Mid sailboat / catamaran	15–20 m	SCW-50 or 230V SCW-100*	Product selection guide

* In the 15–20 m band, SCW-100 may apply if you have generator or shore power; if you anchor on batteries only, the 12V limit still applies. Final model is set during survey.

When Is a 12V Watermaker Not Enough?

Our product selection guide lists these segments where SCW-30 and SCW-50 are not recommended — 230V or 380V models apply:

Segment	Typical length	Recommended alternative
Motor yacht / gulet	18–25 m	SCW-100, SCW-150, SCW-350
Large motor yacht / superyacht	25 m+	SCW-350, SCW-500
Commercial vessel / large fishing boat	25 m+	SCW-500, SCW-1000

Reason: capacity. The 12V range produces at most 50–60 L/hour. Gulets with 8+ people or heavy shower use can need 400 L+ per day — 230V models with generator or shore power are the practical solution.

Within 12V: SCW-30 or SCW-50?

Same voltage group — choice depends on daily litres and battery capacity. SCW-50 produces more in less time; SCW-30 draws much less current.

	SCW-30	SCW-50
Output	30 L/hour	50–60 L/hour
Current (12V)	8–10 A	43 A
Power	120 W	550 W
Target vessel (product page)	≤10 m, RIB	10–14 m sailboat

Starting match

Toward SCW-30: 1–3 people, low use, limited battery/solar

Toward SCW-50: 4–6 people, ~150–200 L/day, adequate bank and charging

Full comparison →

Battery System — The Deciding Factor for 12V

A 12V watermaker draws from the bank at anchor. Per product specs, SCW-30 draws about 8–10 A, SCW-50 43 A. Three hours on SCW-50 means ~130 Ah for the watermaker alone; fridge and other loads add more.

Boats choosing 12V usually plan alternator, solar or occasional marina charging as backup. Bank capacity (Ah), bank type (AGM, gel, lithium) and breaker lines are reviewed during survey — we assess the existing system rather than declaring “enough” by phone.

See 12V watermaker and solar panels for charge balance.

Example Profiles

Illustrative only — final model is confirmed during survey.

Couple liveaboard — 9 m sailboat

No generator, solar + alternator at anchor, ~80 L/day.

12V fits. Consider SCW-30 for low current draw.

Family cruiser — 12 m, 4 crew

Weekend bay hopping, ~140 L/day, 400 Ah AGM bank.

12V fits. SCW-50 or SCW-30 with longer run time.

Catamaran — 17 m, generator onboard

~250 L/day, generator 2 hours daily.

12V borderline. Selection guide suggests SCW-50 or SCW-100 at 15–20 m; with generator, 230V may apply.

Gulet — 22 m, 10 people

Blue cruise, heavy showers, ~500 L/day.

12V not suitable. SCW-150 or SCW-350 — 230V segment.

Frequently Asked Questions

SCW-100 is a 230V / 50Hz AC model. Running it via inverter is technically possible but our selection guide states SCW-100 is not practical on battery-only setups — the bank drains quickly. On 12V systems, Seacraft offers SCW-30 and SCW-50.

The SCW-30 product page lists small yacht, sailboat (≤10 m), RIB and boat camper as target vessels. Installation space and battery capacity are checked during survey.

Daily litres and battery/solar infrastructure decide. Low need and limited current budget point to SCW-30; higher need and adequate bank point to SCW-50. See SCW-30 vs SCW-50 comparison.

SCW-30 and SCW-50 product pages list 12V DC / 24V DC support. SCW-30 specifies 4–5 A at 24V. Fuses and cabling are checked during survey.

Shore power is a valid 230V source only when plugged in at the marina. If you anchor on batteries in bays by day, the 12V limit still applies. Overnight marina production on 230V may be possible — planned during survey based on your routine. See 12V vs 230V.

Is 12V Right for Your Boat?

SCW-30 or SCW-50 recommendation after survey — based on your battery system and daily need

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