Rainman 12 Volt DC Water Maker

Overview

The 12VDC system is the Rainman watermaker that consumes the least power.

It’s a very simple and highly reliable system that can make up to 34 litres (9 gallons) of fresh potable water per hour.

Options exist for this system to be run completely portable without any plumbing or fully plumbed in with a minimum footprint installation.

Our 12VDC system is a great option if you don’t have AC power available to you but want to avoid the complexities and maintenance requirements of more efficient energy recovery systems.

battery watermaker
battery operated desalinator

Two Components – One Watermaker

The system is made up of a pressure supply unit (PSU) and a reverse osmosis unit (RO). Both parts are required to make a complete watermaker.

The PSU lifts the seawater, filters out the sediment and puts the system under high pressure, while the RO unit extracts fresh water from the stream of pressurised seawater. Most of the water goes out to waste as brine output, while about 20% of the volume is extracted as fresh potable water for your tanks.

Unlike the AC (electric) or petrol (gasoline) powered Rainman Watermaker, the 12VDC is compatible only with the single 40″ RO membrane.

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Power

With recent advancements batteries, solar, and wind power, it is easier than ever to have sufficient useable amp-hours available for running your appliances.

Our 12VDC system requires 410 watts, or about 30 amps, to operate.

battery powered desalinator
installed electric watermaker

Installed or Portable

Our traditional system in the blue case can be used as either portable or installed. If you wish to install it, it becomes a two box installation. Various approaches that can be utilised include:

  • Keep it portable, pulling it out and setting it up each time you wish to use it.
  • Leave the unit in a locker, but pull out the hoses and throw overboard to make water, avoiding the need to move the system around on your deck.
  • Keep the system portable, but use a cam-lock fitting to temporarily plumb the system into a teed deck wash fitting. This gives the benefits of an installed system while using your portable unit while underway.
  • Fully plumb the system in, including the autoflush system.

It is worth noting that due to the lower output and shorter power cord of our 12VDC, most customers with this system will choose to fully install the watermaker.

rainman watermaker pickling bucket

Reverse Osmosis Unit

Due to the lower flow rate of the 12VDC PSU, only the single 40″ membrane configuration of the Economy RO unit is supported. This can either be in the traditional blue case or Naked in the easy mounting bracket.

This system will make 26-34 litres per hour (7-9gph).

More information about reverse osmosis »

reverse osmosis battery powered desalinator

Case or Naked

The system can be purchased either as the traditional blue case version or in the Naked configuration. The pricing, performance and power consumption are identical between the two options, so your specific requirements control which is best suited for your application. The table summarises the differences between the two options.

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Features common to both Cased and Naked versions

Permanent magnet TEFC DC Motor
410 watts steady state power consumption
Current draw 30 amps
Power cord length: 1.4 metres (4.5 ft) including battery connectors
Plug type: Anderson Style
Integrated flexible impeller lift pump uses non-proprietary impeller
2 metre (6 ft) maximum lift above sea level
General Pump WMR 316 stainless steel high pressure triplex plungerpump
Integrated General Pump 316SS/ceramic relief valve to prevent overpressurisation
Sound levels – 58dB at 6 metres (20 ft) – see chart

Cased version specific features

Naked version specific features

Case of sturdy injection moulded polypropyleneNo shell
PSU storage/mounting seat: fibreglass reinforced nylon with strapPSU easy mounting kit: fibreglass reinforced nylon for high rigidity and tensile strength
RO Case (mountable if desired): rotomoulded polyethyleneRO easy mounting kit: fibreglass reinforced nylon for high rigidity and tensile strength
Plumbing installation kit at extra costPlumbing installation kit included with purchase
Single 10″ x 2.5″ non-proprietary 5 micron prefilter to remove sediment mounted on PSUSingle 10″ x 2.5″ non-proprietary 5 micron prefilter to remove sediment with SS316 mounting bracket
0 – 40 lph (11 gph) product water flow meter, integrated in to RO case0 – 40 lph (11 gph) product water flow meter, with SS316 mounting bracket
Valve/gauge control assembly integrated into RO caseValve/gauge control assembly at end of 5 metre (16 ft) high pressure hose for remote mounting
5 metre (16 ft) intake hose fitted with one way valve to remain primed, with detachable strainer5 metre (16 ft) intake hose
3 metre (10 ft) brine waste discharge hose6 metre (20 ft) brine waste discharge hose
PSU weight: 24kg (53lb)PSU weight: 23kg (51lb)
PSU Dimensions: 600 x 375 x 270mm (23.6 x 14.8 x 10.6″)PSU Dimensions: 470 x 230 x 240mm (18.5 x 9.1 x 9.5″)
Related RO weight
– Economy: 11kg (24lb)
Related RO weight
– Economy: 10kg (22lb)
Related RO dimensions
Economy: 1,180 x 250 x 130mm (46.5 x 9.8 x 5.1″)
Related RO dimensions (in mounting brackets)
Economy: 1,170 x 220 x 120mm (46.0 x 8.7 x 4.7″)
rainman watermaker 12 volt accessories

Optional Accessories

While the base system will be sufficient for many customers, a number of options are available to get more out of your Rainman watermaker.

  • Our autoflush system will allow you to leave your system unused for longer, without the need to pickle your membranes.
  • The plumbing installation kit is included with the Naked Rainman systems, but can also be a very useful option if you plan to install your Cased Rainman units.
  • A hydrotester will give you indication of the total dissolved solids (TDS) so you can know how your membranes are ageing.

Rainman desalinator optional accessories »

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Spares and Consumables

Your new Rainman system will arrive with enough spares and consumables to keep you going for a while, so most customers do not need to order more with initial purchase. There are a variety of items you will need over time to keep your system running for many years.

Rainman Watermaker spare parts and consumables »

rainman watermaker spare parts

12VDC System Options Gallery

electric desalination system
Cased PSU

12VDC

high output desalination system
Cased Economy RO

1 x 40″ Membrane

12 volt dc watermaker desalination system
Naked PSU

12VDC

economy watermaker desalination system
Naked Economy RO

1 x 40″ Membrane