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AQUA4GEN OWNERS MANUAL CE
LVM AQ412 : 12 Volt LVM AQ424 : 24 Volt
1 : Generator
1 : Drive Coupling
1 : Dee Shackle (8mm)
1 : Turbine Shaft Assembly
4 : Turbine Blades (2 off 115mm, 2 off 90mm)
1 : M6 x 20 Stainless Steel Cap Head
4 : M6 x 20 Stainless Steel Button Head Screws
1 : M6 Stainless Steel Spring Washer
2 : M6 Stainless Steel Washers
2 : M6 Stainless Steel Washers (18mm Dia.) Aqua4gen performance with 115mm
1 : Tow Rope 15 Metres long turbine blades fitted
2 : Cable/Rope Clamps
1 : Mounting Rope 3 Metres long 12
Amps output @12v
1 : Allen Key 5 mm A/F
1 : Allen Key 4 mm A/F
1 : 80mm length of Seizing wire 8
Guarantee 0 1 2 3 4 5 6 7 8 9 10
Thank you for purchasing this product. It has been manufactured to
exacting standards and LVM Products guarantees that should any Boat speed (knots)
defect in materials or workmanship occur within ONE YEAR of the
date of purchase we will repair or replace the defective part free of
charge. Aqua4gen performance with 90mm
Damage caused by misuse, failure to follow instructions, negligence, turbine blades fitted
and modification or transit damage will not be warranted.
LVM Products will not be liable for any loss of revenue or any 12
Amps output @12v
consequential loss or damage to property or persons from any cause
Retain your purchase invoice, as it will be needed in the event of a 8
warranty claim. 6
What is Not Covered 2
· Damage due to improper installation
0 1 2 3 4 5 6 7 8 9 10
· Damage due to improper wiring
Boat speed (knots)
Note: Amps output of a 24v
model will be half shown above.
Please read the manual thoroughly. If you have any questions
please contact us at
The Aquagen is designed to mount onto the pushpit, using the 3M x12mm
Dia. braid on braid rope supplied. It is VERY IMPORTANT to use the rope
mounting method as shown in photos 1 3 this keeps the unit balanced
and allows the Aquagen to swivel and pivot correctly to track the turbine.
Failure to use this exact method of mounting will cause vibration and
excessive wear on the bronze bushes in the drive coupling. Ensure the
knots shown in photo 2 are made on the front face of the unit and the rope
goes back through the lower mounting holes of the unit, then tied off to the
bottom rail as shown in photos 2 3. If only one rail is available fit a deck
mounted eyebolt to retain the lower section of the mounting rope.
Fit the plastic propeller blades onto the turbine
hub using the M6 X 20 Button Head Screws, M6
Stainless steel washers using the Allen key
supplied. Note: the large diameter washers are
used on the thinnest section of the blade. Photo 4.
Photo 5. ATTACHING THE DRIVE COUPLING TO THE AQUAGEN MAIN SHAFT
Align the M6 clearance hole in the drive coupling with the M6 tapped hole in the main shaft. Fit the M6 spring washer under
the head of the M6 x 20 Allen bolt. Insert the bolt through the M6 clearance hole in the drive coupling and fully tighten it into
the main shaft using the Allen key supplied.
Photo 6. ATTACHING THE TOW ROPE TO THE TURBINE AND DRIVE COUPLING
The Aquagen is supplied with 2 off cable/rope clamps these should be used as shown in Photos 5 & 6
Aqua4gen output cable colour Code - The Brown output wire is POSITIVE (+) The Blue output wire is NEGATIVE (-)
Wire Rating - The output wires of the Aqua4gen will require extending. Electrical systems lose energy from the resistance of
the wire size used. The larger the wire size the smaller the loss, however larger cross sectional area wire can be costly and
in some cases more difficult to source. The following table shows recommended wire sizes, they are based on a 3% and
5% energy loss at an average boat speed of 7 knots. It is recommended a minimum wire size of 2.5 sq mm be used.
Single Wire Length
0 5 Metres 6 10 Metres 11 20 Metres
Voltage Drop (%) 3% 5% 3% 5% 3% 5%
12 volt Aqua4gen 6.0 mm2 4.0 mm2 10 mm2 6.0 mm2 25 mm2 16 mm2
24 volt Aqua4gen 2.5 mm2 2.5 mm2 4.0 mm2 2.5 mm2 6.0 mm2 4.0 mm2
Useful wire cross sectional area mm2 conversion to AWG
2.5 mm2 = 14AWG, 4.0 mm2 = 12 AWG, 6.0 mm2 = 10 AWG,
10.0 mm2 = 8 AWG, 16.0 mm2 = 6 AWG, 25.0mm2 = 4AWG
If the Aqua4gen is connected directly to the battery terminals
we recommend a 15 Amp fuse for 12V Models and a 7.5 Amp
fuse for 24v Models is fitted in the brown (positive) wire from
the generator to the battery, so that if a dead short occurred it
would prevent serious damage to the wiring and the generator.
The BROWN OUTPUT WIRE output is connected to the
POSITIVE + terminal of the battery. The BLUE OUTPUT
WIRE to the NEGATIVE terminal of the battery.
Thread the Aquagen output cable carefully through a deck
gland, attach the push - on connectors and covers supplied
to the end of the output cable and the end of your extension
cable. Observing polarity plug them together. The output wires
are then connected to the battery. See Diagram 5. opposite.
The BROWN WIRE is connected to the POSITIVE + terminal
and the BLUE WIRE to the NEGATIVE - terminal.
VERY IMPORTANT. BE CAREFUL, AS INCORRECT CONNECTION WILL DAMAGE THE RECTIFIER. WARRANTY
WILL BE DISCLAIMED.
WARNING : THE AQUAGEN MUST NEVER RUN OPEN CIRCUIT AS HIGH VOLTAGES CAN BE PRODUCED AND THE
SUPPRESSION CAPACITORS MAX. VOLTAGE MAY BE EXCEEDED.
The output wires of the Aqua4gen can be connected directly to the terminals of the battery that requires charging, as shown
in diagram 5., however, if the terminal voltage of the battery is not continually monitored for over voltage (14.2v for 12v
batteries) and (28.4v for 24v batteries) the battery can be seriously damaged. Fitting an LVM voltage regulator will protect
the battery from becoming over charged. You may well have chosen a voltage regulator when purchasing the Aqua4gen,
but we would recommend you look at page 9 SELECTING THE CORRECT LVM VOLTAGE REGULATOR to make sure
you have purchased the correct unit.
You may also consider installing an ammeter, voltmeter or an amphour meter all are available from I LVM Products part
number as follows - (LVM67) 0 20A Ammeter, (LVM69) 0-15v dc Voltmeter, (LVM200) Digital Amp Hour Meter.
If you do not intend to use a LVM voltage regulator with the Aquagen it is extremely important that a similar type of
regulator is used ie. It must be a shunt diverting type regulator that always keeps the Aquagen on load.
YOU MUST NEVER USE A REGULATOR THAT SIMPLY TURNS OFF AND ON THE OUTPUT OF THE AQUAGEN
WHEN THE BATTERY IS FULLY CHARGED. (THIS CAN LEAVE THE AQUAGEN IN AN OPEN CIRCUIT CONDITION
WHICH WILL ALLOW THE TURBINE TO ROTATE AT VERY HIGH SPEED AND DAMAGE THE UNIT)
The towrope with the turbine attached should be stored in a neat coil close to the Aquagen.
Once under way in deep water the turbine/tow rope can be payed out. It is safer to do this at around 1-2 Knots as the
rope will start to turn as soon as it enters the water. The turbine is designed to surface at the following speeds
Standard 115mm turbine blade - 9 Knots Small 90mm turbine blade - 11 knots
Retrieving the turbine/tow rope can be achieved in two ways
1. Slow yacht/boat to 1-2 Knots, then pull in towrope.
2. Make a tack to turn the yacht/boat at 90 Deg. to slow it down and bring along side the turbine/tow rope.
When pulling in the towrope it is very important that it is untwisted and coiled neatly ready to use again.
Note: If for any reason the turbine surfaces before 9 knots when using the 115mm blades or 11 knots using the 90mm
(this may be caused by your particular hull shape of the yacht creating an underwater wash effect) add one or two
25mm propeller shaft anodes to the turbine shaft close to the turbine hub, or increase the length of the towrope.
1. Check drive shackle bronze bushes for wear. Apply a little marine grease
to the bronze bushes from time to time. Typical life of the bronze bushes
3,000 7,000 nautical miles.
2. Check the tow rope for wear at intervals, particularly the area around the
Dee Shackle and Eye bolt on the turbine shaft. By cutting 1 to 2 inches off
the rope a new section can be created.
3. Check tightness of the Dee Shackle pin.
The AQUA4GEN generator unit is design to give many years of reliable service as it contains really only one moving part
and one electronic component; they are the permanent magnet rotor and a 3 phase rectifier.
The only parts that can wear are the main bearing ball races.
A simple test to prove there is an output voltage from the Aqua4gen can be carried out whilst the Aqua4gen is in it's
working position. Disconnect the Aqua4gen output cable from the battery, or the TB regulator if fitted. With the towrope
disconnected turn the main shaft, it should turn freely ( Note : There will always be a slight resistance felt this is the cogging
effect of the generator) , then touch the two output leads together (shorting them) the main shaft should now be noticeably
more difficult to turn. If this does not happen, check that your extension wire connection from the actual Aqua4gen output
cables are not corroded or have become disconnected. If there is a fuse fitted in the output cable check it has not blown.
The following tools and equipment will be needed to carry out tests and repairs to the Aqua4gen
A multimeter which can read 0 - 100 volts DC, measure resistance, have a diode test, and a continuity (buzzer test).
Pozi drive screwdriver.
Soldering iron and solder.
Piece of hardwood, and a brass rod 12mm diameter X 250mm long or similar.
For pivot bearing replacement, a bench vice will be required.
MEASURING OUTPUT VOLTAGE
If you have a lathe or some other means of turning the main shaft at a known RPM a 12v model produces 0.06v per rev.
and a 24v model 0.12v per rev.
If no voltage is present, check that your extension wire connection from the actual generators output cables are not
corroded or have become disconnected. If there is a fuse fitted in the output cable check it has not blown. Check output
voltage again at the generators actual output cable. If there is still no voltage output, go to the instructions and tests listed
under heading NO OUTPUT.
1. Check turbine blades are not damaged.
2. Check towrope is not kinked and twisted.
3. Check main shaft of Aquagen turns freely. Note : There will always be a slight resistance felt this is the cogging effect of
4. If the output from the Aquagen has been connected to the battery the wrong way round (reverse connection) the rectifier
will be damaged, but still may give a reduced output. (Replace rectifier).
1.Using a multimeter check continuity of output extension cable, and connectors.
2. Check fuse.
3. Remove the generator from mounting,. Remove the rear cover (6 off screws) and hinge back cover. A component called
a rectifier that converts the 3 Phase A/C output voltage of the stator into D.C volts is mounted on the inside of the cover.
(Note later models have also suppression capacitors soldered to the rectifier.)
Disconnect the 3 push fit connectors (output wires from stator) which are attached to the centre terminals of the rectifier. No
need to remember which order or terminal they come from, as they can fit on any of the 3 centre terminals.
Using a multimeter set on resistance measurement (ohms) check the resistance in turn of the of 3 output wires (in pairs)
from the stator. They should read 1.6 ohms 12v model, 6.5 ohms 24v model.
CHECKING A/C OUTPUT VOLTAGE OF STATOR
Set the multimeter to read A/C volts, attach test leads to the 3 off stator output wires (in pairs) then turn the main shaft of
the generator by hand (any direction) small voltage should be indicated on the multimeter.
Check the stator and suppression capacitors do not look burnt or overheated. Check tightness of stator retaining screws.
If at any time the generators output leads have ever been connected to battery terminals the wrong way round, or the
generator has been struck by lightening then the rectifier may be have been damaged.
Readings taken of a Good Rectifier.
Set a multimeter to diode test, then check: -
1. Disconnect all connectors from the rectifier.
2. Attach the red test lead from multimeter to the + plus terminal of the rectifier, attach the black test lead to the - negative
terminal. RESULT No Reading.
3. Reverse the test leads i.e. attach the red test lead to the - negative terminal of the rectifier then the black test lead to the
+ plus terminal. RESULT 0.8 - 0.9 volts
4. Connect the test leads to the 3 centre terminals of the rectifier in pairs. RESULT No Reading.
Readings taken of a Faulty Rectifier.
1. Disconnect all connectors from the rectifier.
2. Attach the red test lead from multimeter to the + plus terminal of the rectifier, attach the black test lead to the - negative
terminal. RESULT 0 Volts
3. Reverse the test leads ie. attach the red test lead to the - negative terminal of the rectifier then the black test lead to the
+ plus terminal. RESULT 0 Volts
4.Connect the test leads to the 3 centre terminals of the rectifier in turn in pairs. RESULT 0 Volts
If in doubt about the condition of the rectifier, replace with a new one. Refit the 3 off 3 phase stator output leads to the
centre terminals of rectifier.
Set the multimeter to read DC. volts. Attach the red test lead of the multimeter onto the + plus terminal of the rectifier, then
the black test lead onto the - negative terminal. Turn the main shaft of the generator by hand (any direction) this should
indicate a voltage on the multimeter. Refit Red and Black DC. output leads from the rectifier. Refit rear cover using a new
gasket make sure all wires are clear of the rotor.
KNOCKING/SCRAPING SOUND ONCE PER REVOLUTION
Whilst the generator is in it's working position, check that the M6 allen screw which retains the drive coupling assembly to
the main shaft is fully tightened.
Remove rear cover and check the condition of the rotor, it may be rubbing on the stator.
Inner main bearing could be worn, check for axial and radial movement. Check the tightness of the 4off M5 stator retaining
screws, this can cause a noise if slightly loose.
GENERAL MECHANICAL CONTINUOUS NOISE
Remove the towrope and check axial and radial play in the main front bearing. Remove rear cover and check inner main
bearing in the same manner. If large amount of play is found replace main bearings.
Follow instructions listed REPLACING MAIN BEARINGS.
GENERAL ELECTRICAL VIBRATION NOISE
It is normal for the Aqua4gen to produce a very slight magnetic cogging vibration when rotating, and an electrical vibration
whilst charging. This noise will be greatly amplified if the Aqua4gen is mounted on a very hollow section of a yacht/boat.
INSTRUCTIONS FOR REMOVING AND REPLACING MAIN BEARINGS
Parts required: 2 off - Main bearings LVM Part No. Bearing 783
1 off Main shaft water seal LVM Part No. Seal 650
1 off - Rear cover gasket LVM Part No. Gasket 548
2 off - Circlips 15mm LVM Part No. Circlip 862
6 off - Rear cover retaining screws LVM Part No. Screw 664
1 off - Small amount of Loctite 638 in tube.
Tools required: Hammer, Circlip pliers, Pozi drive screwdriver, Piece of hardwood, and a brass rod 12mm diameter X
250mm long or similar.
1. Disconnect output leads, and remove Aqua4gen from mounting.
2. Remove the main shaft water seal (pierce seal front face with screw driver and lever out.
3. Remove the front 15mm circlip on the main shaft.
4 . Remove 6 off self-tapping screws retaining the rear cover.
5. Place a piece of hard wood on a concrete floor. Holding the Aqua4gen with the rear cover held back and main shaft
downwards, lift and force downwards the generators main shaft onto the piece of hard wood. This should displace
the main shaft inwards. Alternatively the main shaft can be pressed out, or hammered out, but take care not to bruise
the end of main shaft.
6. The main shaft/ rotor assembly should now have moved inwards into the main housing.
7. Using a piece of brass rod, or similar, so as not to damage the end of the main shaft - tap the shaft through both the
bearings and remove rotor assembly from the rear of the main housing.
8. Having removed the rotor from casting. Check the main shaft for wear, particularly the areas the main bearings are
positioned. If the shaft wear is found to be excessive a new shaft will have to be fitted. Contact LVM Products.
9. Remove the large internal circlip which is located in front of the main outer bearing, then using a brass rod and a
hammer knock out the main bearings from the casting.
10. Refit new main bearings using a little Loctite Bearing Fit smeared on the O.D. of the bearings.
11. Refit large internal circlip in front of main outer bearing (this circlip is acts as a spacer for the water seal)
12. Clean the main shaft, then clean the rotor magnet with sellotape (sticky side) to remove small pieces of steel pickup.
13. Smear a little Loctite Bearing Fit onto the main shaft close to the rotor, and in the bore of the outer main bearing.
14. Insert the main shaft/rotor assembly into the generator main bearings. WARNING! The rotor magnets are very powerful
and will quickly draw the assembly into the stator. When the main shaft/rotor assembly is fully inserted check it rotates
15. Smear a little Loctite Bearing Fit on the outer main bearing inner race to shaft. i.e. between the O.D. of the shaft and
the I.D. of the inner race. Push the main shaft in and out a little to spread the Loctite between the outer main bearings
bore and the main shaft.
16. Fit new 15mm circlip on main shaft.
17. Fit new main shaft water seal (grease well on assembly)
18. Refit rear cover using a new gasket, make sure all internal wiring is clear of the rotor.
SELECTING THE CORRECT LVM VOLTAGE REGULATOR
The output of the Aquagen can be simply connected directly to the terminals of the battery that requires charging, however,
if the terminal voltage of the battery is not continually monitored for over voltage (14.2v for 12v batteries) and (28.4v for 24v
batteries) the battery can be seriously damaged. Fitting an LVM voltage regulator will protect the battery from becoming
TEMPERATURE COMPENSATION - This additional feature is available on all LVM regulators. If the battery is located in a
building where the ambient temperature is always around 20 deg.C then standard regulators can be used. However if you
intend to locate a battery where temperatures may go down to freezing and perhaps rise to tropical temperatures then you
should install a regulator that is fitted with a temperature compensation circuit. This automatically allows the battery to be
charged at a higher voltage as the temperature drops, and a lower voltage if the temperature increases. Simply add (-T)
after the LVM Product No. ie. 4TB12 T.
The regulator suitable for the Aqua4gen
Twin battery regulator LVM product No. 4TB12, 4TB24 - These units are connected between the output of the Aquagen
or Solargen module and the battery terminals. They control the actual output voltage of Aquagen or Solargen by diverting
power to a high wattage wire wound dump resistor when their output voltage reaches 14.2v (12v systems) or 28.4 (24v
systems). They have two schottky blocking diodes built into the regulator which enables them to monitor and control the
charge to two batteries totally independent of each other, therefore making it ideal for separate charging of engine starting
and domestic batteries. The battery with the lowest terminal voltage will be charged first, then gradually when both batteries
become fully charged the Aquagen or Solargen modules output is automatically diverted to the dump resistor, this does two
things it stops the batteries over charging and keeps the Aqua4gen always on load.
Note: This regulator draws NO standby current from the battery.
Also available from LVM Products are Diode Units LVM product No. 4DU, 6DU
The 4DU when combined with a 2TB or 4TB regulator enables one additional battery to be charged.
The 6DU when combined with a 4TB regulator enables two additional batteries to be charged.
The Aqua4gen and a Solargen modules output may often be combined, the table below shows the recommended regulator
for various systems. Note: Two batteries wired in parallel are classed as one independent battery. Having selected the
recommended regulator model from the table simply add the voltage required ie. 4TB12 for a 12v system or 4TB24 for a 24v
system. Basic wiring diagram are shown on page 10. If you cannot find your particular system or application within the table
or require full wiring diagrams please check our web site www.lvm-ltd.com or call our sales office who will e-mail, fax or post
VOLTAGE REGULATOR TABLE
Number of independent batteries to be charged
SYSTEM 1 2 3 4
1 x Aqua4gen 4TB 4TB 4TB + 4DU 4TB + 6DU
1 x Aqua4gen + 5w Solargen panel 4TB 4TB 4TB + 4DU 4TB + 6DU
1 x Aqua4gen + 10w Solargen panel 4TB 4TB 4TB + 4DU 4TB + 6DU
1 x Aqua4gen + 17w Solargen panel 4TB 4TB 4TB + 4DU 4TB + 6DU
1 x Aqua4gen + 25w Solargen panel 4TB 4TB 4TB + 4DU 4TB + 6DU
1 x Aqua4gen + 25w+10w Solargen panel 4TB 4TB 4TB + 4DU 4TB + 6DU
1 x Aqua4gen + 25w+25w Solargen panel 4TB 4TB 4TB + 4DU 4TB + 6DU
1 x Aqua4gen + up to 100w Solargen panels 4TB 4TB 4TB + 4DU 4TB + 6DU