Marine Generators & Gensets AC Roto Diesel Brand
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Marine Generators & Gensets AC Roto Diesel Brand at Catalogue

Quality marine diesel generators.  Inexpensive replacement genset for power boats. Australian made. 

Install in One Hour!

 Roto diesel Genset installed in this petrol Riviera with twin Mercruiser stendrives.   Boat located in Melbourne.   Used for battery charging, water heating and the stove.  Note lagging over stainless 316 exhaust elbow.  A 4 amp battery charger maintains starter battery.


Completed Roto Gensets at our Sydney workshop.


"Gave generator a run today, runs very well I am pleased with it.
Had a light load running for half an hour or so than boiled an electric kettle on it, no problem! Don"

Marine Diesel
AC Gensets

With Wet exhaust.

Auto Shutdown.


CE, TUV Tested. 
Engine & Alternator meets
Australian Standards EN60204-1
Engine is EPA Certified.



Sanctuary Cove Boat Show

Queensland Boat Installation.


The "ROTO" range of Marine AC Gensets sets a new benchmark in high output and simple design.  Designed and built in Australia using the best possible Australian and international components.

We now have five years of these gensets in the marine marketplace.  Their reliability from a warranty and service perspective has been excellent.

Smaller Boats can now house a reliable source of AC power at an affordable price.   Motorboats no longer need to run larger gensets for their low load requirements. 

A new feature is the Air Charge Cooling system for the 5Kva genset reducing expelled heat from the generator to room temperature.  A 316 stainless wet exhaust elbow combines exhaust fumes with water prior to the waterlift muffler.  There is minimal latent heat build up from this motor thanks to the airflow, wet exhaust and air cooling system.

Units are now installed over the past 5 years are in Melbourne, Paynesville Vic, Sydney & Townsville. Melbourne, Cairns, New Zealand, Malaysia, Canada, Perth and a bunch of other locations.  Including many yachts of no fixed address!!!

If you want a simple, reliable generator for your boat with all the safety features, consider the Roto genset.   A Roto Genset will heat your water, charge your batteries, cook your toast, run the hotplate  and boil your kettle without fuss.

Basic Pricing:  Includes GST

5.5kva Marinised AC Genset  $4700

Great Features:

- Strong and robust 4 stroke diesel diesel engine with United States Environmental Protection Agency Certification for emissions. 

- Australian made stainless steel wet exhaust elbow.
- Oversized motor with approximately 20% % power reserve for long life.  Engine manufactured to ISO9001 standards. 
- Raw water failure alarm with engine stop.
- Separate & completely isolated "above ground" electrical system for AC Genset motor.
- Oil pressure switch with engine stop.
- Electric fuel pump.
- In built dynamo Trickle Charger dedicated to AC Genset's starter battery.... no flat starter battery!
- Continuous duty rated electric Johnson raw water pump.   Operates only when engine is running via either your boat's battery charger or from switch-mode 240 volt AC to to 12 volt DC power supply.
Heavy duty base frame with engine vibration dampeners preinstalled offering easy installation simply bolt the entire unit to the base structure.
- Remote mounted quality hinged door relay box, with 1 metre wiring loom and quick connect plugs.  Hour meter installed.
6 metre helm control wiring loom standard 3 metre and 6 metre extension control panel wiring looms available.  Simple standard industry plugs.
- Remote installed hour meter if required.
- Optional relay box start/stop switch.
- Optional continuous rated Johnson air blower (with engine shutdown) for confined spaces.  Operates only when engine is running.
- Simple 100 hour oil service with oil drain.
- Compact size. Weighs 70-80 kilos. Approximate engine base footprint 30cm x 30cm.  Physical size approximately 50 x 50 x 85cm.
- Inexpensive spare parts, simple service and parts replacement.
- One year parts only warranty. (Everything is modular......even the engine can be replaced in 30 minutes!)
CE, TUV Tested.  Engine & Alternator meets Australian Standards EN60204. Engine is EPA Certified.

Noise: Unhoused and unmuffled DC Genset 80Db at 4 metres (comparison unhoused Onan MDJE 240 volt AC Genset is 80Db at 4 metres with wet exhaust.)   70 DB in non insulated cabin approximately 3 metres from engine.  If you have a sound insulated engine room, the noise from this generator without will be around 65-67db.  These test results are an indication only.

Output: Rate for Maximum continuous output is 3Kva or 5kva.   

Exhaust Considerations:    The raw water pump will only operate when the engine is running. The waterlock muffler must be installed below the outlet of the stainless exhaust elbow to avoid any possibility of the raw water backing up into and damaging the engine.  If possible have a vertical loop in the hose after the muffler to remove any siphoning risk.   Sailing boats should always install an anti siphon valve after the muffler to ensure water is not sucked in via the exhaust hull fitting when the boat is heeled over.

Ventilation: The Roto Genset will require adequate engine room ventilation. The exhaust system is also water injection cooled. This makes the genset ideal for smaller engine room compartments.  We also offer an electric air blower option to circulate new air into the engine compartment.

Basic Installation:  Your AC Genset will arrive fully assembled.  Simply place in position.  Secure engine mounts to the structure.  Attach exhaust hose to stainless exhaust elbow.   Position fuel pump, connect wiring with quick connect plugs and connect fuel lines.  Position raw water pump, and connect wiring plugs.   Position and mount the relay box.  Connect wiring loom plugs.  Attach starter motor battery.       Turn on ignition to activate fuel pump, bleed fuel line.  Engine will then start.

Floor Space Required for mounting  cm:  3 Kva: 64L x 46W x 54H.    5 Kva: 70L x 50W x 60H.

240 Volt connections:  The AC Genset must be connected to the electrical system of your boat by a licensed electrician.  We do not provide any 240 volt distribution products and you will need to acquire these separately and have them installed by a person licensed to do so.

Ordering options:  Prices include GST.


5.5Kva AC Genset 

 Electrics & Wiring:
6 metre helm control wiring loom extension Included
Additional 6 metre helm control wiring loom extension $150
Johnson Pump Continuous 162 cu feet/minute Air Blower $145

Waterlock Muffler: Side In Top Out: $189
Sailing Boat Anti Siphon Valve: $205
1.5" Exhaust Hose "Lloyds Approved":  $75 metre.
Pack of 10 marine stainless 1.5" hose clamps: $40
Raw Water Delivery Hose 0.5" $15 metre.
Pack of 10 marine stainless 0.5" hose clamps $20
Bronze 1/2" raw water skin fitting with bronze/stainless ball valve  with  1/2" raw water strainer  Kit $150
Stainless 1.5" exhaust skin fitting $40
1/2" rubber reinforced raw water hose $15 metre.

5/16" Fuel Delivery Hose $10 metre
1/4" Fuel Return Hose $10 metre
Additional In Line 5/16" metal fuel filters (replace every 100 hours) $15 each
Diesel Fuel Tanks 40 litre $300, 40 litre $335 Click here

All specifications and information are subject to review and further updating.
Plus freight costs.  Credit card surcharge 2.5%.


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