Page last updated Oct 20, 2021 @ 10:11pm


aquair1.jpg (13518 bytes)   aquair-dims.gif (14230 bytes)   aquair-diagram.gif (17849 bytes)   aquair-perform.gif (15580 bytes)     
click thumbnail
image above to enlarge

Aquair UW Submersible Generator
12Vdc, 24Vdc or 48Vdc
approx 100 watts maximum

If you have a fast flowing stream that is at least 13 inches deep you can install a Submersible Generator easily without having to build a dam or install piping.   This can save a lot of money when compared to a typical piped hydroelectric system.

The Aquair UW submersible generator is a special low-speed, high output alternator, mounted in an oil-filled cast aluminum housing.  It was developed to charge lighting batteries on towed barges in the North Sea.  So it can also be used on boats or yachts where you require additional battery charging current.  It has been pressure tested successfully to a depth of 3 meters (9 feet).

When mounted in a stream flowing 9 mph, it charges a 12 volt battery at 8 amps, or 2.4 kilowatt hours per day.  It can produce 1.5 kilowatt hours per day in a stream moving 6 mph.  Three models are available--one for 12VDC, one for 24VDC, and one for 48Vdc systems.

The propeller is made of ductile aluminum, which can be hammered back into shape if it is hit by floating debris.  Replacement propellers are available in case of severe damage.

Installation requires secure mounting, such as on a vertical pole from a bridge or on a cantilever beam from one side of the stream.  If your stream is subject to violent flows due to thunder storms or flood control releases, you should have some method of raising the generator out of the way.  To avoid overcharging any connected batteries use with a non-shorting charge controller such as the C-40 that will disconnect the AQUAIR UW when the batteries are full.  A diversion load is not required for the AQUAIR UW since over-speed is not a concern as with other types of hydroelectric generators.  But due to the possibility for high open circuit (no load) voltage, the charge controller must be rated for this high voltage if no diversion load is used.

The Aquair is 14.5 inches long.  The generator is 8-3/8 inches in diameter and the propeller is 12-1/2 inches in diameter.  It weighs 30 pounds.

Electrical Specs

Parameter at all voltages 12VDC 24VDC 48VDC
Output at 6 mph * 70 Watts 6 Amps 3 Amps 1.5 Amps
Output at 9 mph * 100 Watts 8.5 Amps 4.2 Amps 2.1 Amps
Max Open Circuit Voltage
(at no load)
---- 100V 200V 400V
Recommended controller
if diversion load IS NOT used #
---- Trace C-40
Recommended controller
if diversion load IS used
---- Trace C-35 or similar Trace C-35 or similar Trace C-40 or similar
 * with standard prop
 # these controllers are rated for the maximum open circuit voltage


DC cable length and voltage drop must be evaluated carefully when laying out system.  Click here for our simple voltage drop calculator.

Options are described in spec sheets at top of this page (click thumbnail).  Select options using drop-down menus below when ordering.

May 5, 2017 UPDATE: This product was formerly made by a company called Ampair Energy Ltd. in the UK.  However, they went out of business in 2015 and this product was acquired by Seamap (UK) Ltd.  Inventory and manufacturing was then moved to Singapore.  We are now able to offer this product again to our customers.

Note that price of this item can change unexpectedly due to exchange rate fluctuations.  If price is different at time you place order we will contact you for approval before processing.


Customers who purchased this product also ordered:
(click underlined words to see product pages)
Spare propellers
Diversion load DLOAD-AIR, DLOAD-WTR
Diversion load controller of proper voltage & current rating such as C-35, C-40.
Inverter for Off-grid FX-VFX or grid-tie GTFX-GVFX operation.
Battery bank.


Are YOU ready for the next power outage?

 1 Videos
 2 Outage Archives
 3 Utility Industry
 4 Why You Need Backup
 5 Personal Stories
 6 NoOutage Configurations
 7 Safety
 8 Sizing for Your Needs
 9 Voltage Drop Calculator
10 Test Reports
11 Placing Order
12 Equipment Leasing
13 Books & Videos  
14 Financing
15 Frequently Asked
16 Future Technologies
17 Electricity Glossary
18 Help with Plug Types
19 Who We Are
20 Why Buy Here
21 Our Customers
22 Pick a Contractor
23 Privacy Promise
24 Safe Shopping Guarantee
25 Terms & Conditions
26 What's New
27 Contacting Us
28 Parts Lookup
29 Parts & Service
30 Made in USA
31 Links

We welcome your feedback or questions.  Click here to contact us.
See our Terms & Conditions before using information or ordering from this web site.
Copyright 1999-2022 LLC.  All rights reserved.