SCW-30 vs SCW-50 Comparison

Seacraft's 12V DC range offers two main capacity options: SCW-30 (30 L/hour) and SCW-50 (50–60 L/hour). Both share the same voltage group; the difference is hourly output and current draw from the battery. SCW-50 produces more water in less time; SCW-30 draws significantly less current.

This comparison is based on technical data from our product pages. For daily need calculations see how much capacity for a yacht; for power and batteries see 12V vs 230V and 12V watermaker and solar panels.

At a Glance

SCW-30: Small crew, low current (8–10 A), ≤10 m boats

SCW-50: Higher demand, 43 A, 10–14 m boats

Technical Comparison

Values taken from the technical specifications table on each product page.

Specification	SCW-30	SCW-50 PRO
Hourly output	30 L/hour	50–60 L/hour
Catalogue daily capacity	720 L/day	1200 L/day
Voltage	12V DC / 24V DC	12V DC / 24V DC
Current (12V)	8–10 A (15 A fuse)	43 A
Current (24V)	4–5 A (7.5 A fuse)	—
Power	120 W	550 W
Operating pressure	45/69 Bar	55 Bar
Membrane	2521 × 1	2540 × 1
Sound level	45–55 dB	25 dB
Target vessel (as listed on site)	Small yacht, sailboat (≤10 m), RIB, boat camper	Mid-size sailboat (10–14 m), small motor yacht
Product page	SCW-30	Compact · Modular

Catalogue daily capacity (720 / 1200 L) assumes continuous 24-hour operation. In practice you typically run the unit for a few hours per day.

Same Daily Need — Different Run Time

Hourly capacity directly affects how long the unit must run. The table below uses nominal 30 and 50 L/hour values; where SCW-50 delivers 60 L/hour, run times are even shorter.

Daily need	SCW-30 (30 L/hour)	SCW-50 (50 L/hour)
90 L	~3 hours	~1.8 hours
120 L	~4 hours	~2.4 hours
150 L	~5 hours	~3 hours
200 L	~6.5 hours	~4 hours

Our capacity guide suggests aiming for 2–5 hours of run time per day. At 200 L/day, SCW-30 exceeds that range; SCW-50 fits better or daily consumption should be reviewed — final choice is made during survey.

Battery Draw — The Decisive Difference

SCW-30 — 120 W / 8–10 A

The product page describes SCW-30 as a highly energy-efficient unit at 10 DC Amper on 12V. Three hours of operation expects roughly 24–30 Ah draw. For boats at anchor on limited battery or solar, this low current is a major advantage.

See our solar panel guide — SCW-30 profiles are generally easier to balance.

SCW-50 — 550 W / 43 A

SCW-50 draws roughly four times more current for the same duration. Three hours means ~130 Ah for the watermaker alone. With fridge, autopilot and other loads, a strong battery bank and backup charging (alternator, marina) are needed.

If daily need justifies SCW-50, battery and charging infrastructure must be planned accordingly.

Equipment and Control Differences

Summary from the equipment specifications table on each product page.

SCW-30

Remote control panel with gauges and buttons
Analog flow meter (output monitoring)
Product water test outlet on panel
Automatic backwash and timed re-flush
Super compact design with single 21-inch membrane
Clark pump: 30.7 × 63 × 21.3 cm (14 kg); feed unit: 24.7 × 17 × 34.5 cm (6.6 kg)

SCW-50 PRO (Compact / Modular)

5'' touchscreen control panel
Pressure, flow, water quality and run-hour monitoring
Automatic product water rejection (salinity)
Low / high pressure protection, safety system
Dual automation — manual buttons independent of touchscreen
Compact case: 1150 × 750 × 390 mm (25 kg) · Modular case: 400 × 350 × 165 mm

SCW-50 is offered as PRO COMPACT and PRO MODULAR with the same technical capacity; the difference is installation layout. Available space is assessed during survey.

SCW-30 or SCW-50?

Signals toward SCW-30

Boat ≤10 m (sailboat, RIB, boat camper)
1–3 people, low–medium water use
Daily need around 120 L or less
Limited battery or solar capacity
Low current draw is a priority

SCW-30 product page →

Signals toward SCW-50

10–14 m mid-size sailboat or small motor yacht
4–6 people, more comfortable shower and galley use
Daily need in the ~150–200 L range or above
Adequate battery bank and alternator / marina charging
5'' touchscreen automation and salinity rejection wanted

SCW-50 product group →

Borderline cases — e.g. 130 L/day with limited battery — are resolved during survey: whether SCW-30 is enough or infrastructure must be upgraded for SCW-50.

Frequently Asked Questions

No. Both SCW-50 versions share the same specs: 50–60 L/hour, 43 A, 550 W. The difference is case layout and installation only. On-board space is the deciding factor during survey. See Compact and Modular pages.

If daily need is met with SCW-30 in 2–5 hours, yes — the low current advantage applies. If need is 150 L+ and SCW-30 would run over 5 hours/day, SCW-50 or reduced consumption should be considered. SCW-30 cannot cover demand beyond its capacity.

Both product pages list 12V DC / 24V DC support. SCW-30 specifies 4–5 A at 24V (7.5 A fuse). Fuse line and cable sizing are checked during survey.

Product tables list 45–55 dB for SCW-30 and 25 dB for SCW-50 PRO. Mounting location and hull structure affect perceived noise.

Options are reviewed during survey: upgrade battery bank and charging, add solar support, reduce daily consumption habits, or accept longer run times on SCW-30. There is no single phone answer.

SCW-30 or SCW-50 — Let's Decide at Survey

Model recommendation based on your electrical setup and daily need

Book an Appointment Call: +90 252 412 90 78