Great job! You may want to consider a small radiator with coolant instead of using the salt water. There will eventually be corosion and build-up within your cooling system.
What about motor speed? I tried the same with a 3000rpm 7.2kw motor on a 5hp 2 stroke outboard, but the motor is by far not running quick enough. I 3d printed another prop with a steeper pitch, but the goal is to use a belt drive
I was able to reach 5000 rpm with the steepest prop available, with a power draw of approximately 11kW ! Quite an achievement to be able to get on plane and up to 20 knots with two people on board.
i paused your video then spent 2 hours going down a google rabbit hole looking for an electric motor capable of replacing the 125hp powerhead on my boat. @746 watts = 1 hp. id need almost 90kw to reach that goal. ok so a used ev car motor off ebay...but then id need a 90kw battery also from ebay and that only lasts 1 hr at full tilt. no wonder this isnt more popular...the parts are expensive as all hell. in real life you'd need 270-300 kw battery to spend the day with the family on the water. 4 used tesla 85kw packs $6,000. used ev motor strong enough $1-3k, controller / wiring and the list goes and goes. bare minimum $10k to build a 120hp electric outboard with mostly everything. not including rigging/ steering, infrastructure to hull for batteries, machining, or freight shipping on all of the above parts. if i had to guess itd be closer to 20k than 10k all in. but heres where my theory diverges...cars are very heavy...they come from the factory with (1) 85kw battery pack. how the hell does it go all day? what kind of electric voodoo or sorcery is this?
It is useless to go electric for a speedboat, unless you spend under 45 min full speed. Energy storage solutions aren't advanced enough at this moment, but this may change in the future. Cars are very different from boats : A boat will go close from full power all the time as it has to push the water to move forward. Cars on the other hand will use most of their available engine power while accelerating, and then use only 10 to 25% of their available power to stay at a reasonable speed. Making the batteries run much longer than boats.
Great job! You may want to consider a small radiator with coolant instead of using the salt water. There will eventually be corosion and build-up within your cooling system.
Thank you ! This is what I installed in the former oil pan, an heat exchanger and a separate cooling loop with coolant for the motor and inverter.
Verry good stuff here !
Glad you like it!
Thanks for sharing! You've got it running really smooth! Can you tell us what heat exchanger you've used?
Yes ! I am quite happy with the result ! I used a plate heat exchager originally designed to cool down beer. You can see it at 3:18
Very interesting and well done ! Any idea about the overall cost ?
Thank you for your comment. For the outboard itself, overall cost is around 2.500€
What about motor speed? I tried the same with a 3000rpm 7.2kw motor on a 5hp 2 stroke outboard, but the motor is by far not running quick enough. I 3d printed another prop with a steeper pitch, but the goal is to use a belt drive
I was able to reach 5000 rpm with the steepest prop available, with a power draw of approximately 11kW ! Quite an achievement to be able to get on plane and up to 20 knots with two people on board.
Awesome what are you pulling kw around 11 knots 😎@@teyscocset
i paused your video then spent 2 hours going down a google rabbit hole looking for an electric motor capable of replacing the 125hp powerhead on my boat. @746 watts = 1 hp. id need almost 90kw to reach that goal. ok so a used ev car motor off ebay...but then id need a 90kw battery also from ebay and that only lasts 1 hr at full tilt. no wonder this isnt more popular...the parts are expensive as all hell. in real life you'd need 270-300 kw battery to spend the day with the family on the water. 4 used tesla 85kw packs $6,000. used ev motor strong enough $1-3k, controller / wiring and the list goes and goes. bare minimum $10k to build a 120hp electric outboard with mostly everything. not including rigging/ steering, infrastructure to hull for batteries, machining, or freight shipping on all of the above parts. if i had to guess itd be closer to 20k than 10k all in.
but heres where my theory diverges...cars are very heavy...they come from the factory with (1) 85kw battery pack. how the hell does it go all day? what kind of electric voodoo or sorcery is this?
It is useless to go electric for a speedboat, unless you spend under 45 min full speed. Energy storage solutions aren't advanced enough at this moment, but this may change in the future.
Cars are very different from boats : A boat will go close from full power all the time as it has to push the water to move forward. Cars on the other hand will use most of their available engine power while accelerating, and then use only 10 to 25% of their available power to stay at a reasonable speed. Making the batteries run much longer than boats.