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Quick answer · updated 5 September 2026

How much power does a 12 V watermaker use?

The 12 twelve-volt systems we rank draw 108–700 W while running. For 100 litres a day that is between 31 and 106 amp-hours out of the bank.

Running draw108–700 W12 systems rated for 12 V
Energy per day367–1,270 Whfor 100 litres
Solar to match92–318 Wof array, on a clear day

Twelve volts is the practical ceiling for a modest cruising boat: no inverter, no generator, straight off the house bank. The trade is output — the highest-output systems in the table are all 48 V or mains, because the current at 12 V would be unmanageable.

The spread inside this group is what matters. Same voltage, same tank, and the difference between the leanest and the thirstiest is roughly a whole extra solar panel of daily generation.

Every 12 V system we rank, most efficient first.

SystemPowerOutput L/hrDraw WWh per litrePrice
Zen 30
Schenker
12/24V DC30110
3.7
$6,300
Zen 100
Schenker
12/24/48V DC or AC100400
4.0
$9,600
Ventura 150 Deluxe
Spectra
12/24V DC24108
4.5
$6,000
Ventura 150 Connect
Spectra
12/24V DC24108
4.5
$7,400
Newport 400C
Spectra
12/24/48V DC64288
4.5
$14,500
Zen 50
Schenker
12/24V DC50240
4.8
$7,800
D100 DUO
Dessalatorreported
12/24V DC100700
7.0
on request
D60 Freedom
Dessalatorreported
12/24V DC60550
9.2
on request
D60 DUO
Dessalatorreported
12/24V DC60550
9.2
on request
Scout SW20
LEDIreported
12V DC20200
10.0
on request
Portable 12VDC 34L
Rainman
12V DC26–37400
12.7
$4,898
Modular 12VDC 34L
Rainman
12V DC26–37400
12.7
$5,053
Under 6 Wh/L · energy recovery
6–12 Wh/L
Over 12 Wh/L
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Where this is worked through

12 volt systems in full12 V vs 24 V vs 240 V
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Where these numbers come from. Every figure on this page is computed at build time from the comparison table — rated output and rated draw as the manufacturer publishes them, with watt-hours per litre derived as one divided by the other. Nothing is typed in by hand, so nothing here can drift from the table. Where a figure is an assumption rather than a specification it is labelled as one. Methodology · the table.