|
Greetings,
Reposting this topic the new group location with some photos. Hopefully some feedback or suggestions.,
Looking for advice on a 15kW 48V electric motors to fit to a Yanmar SD25 sail drive (new model of the SD20).
Application is an under construction 52' sailing catamaran.
Some broad boat parameters:
Ocean going world cruising catamaran – composite epoxy structure.
L 52’, Draft 2’ Weight approx. 8500kg / 19,000lb
Full electric propulsion, galley and other services including hot water.
Motors retractable: 2 x 15kw 48v + regen
Battery bank: circa 16kw 48v
House loads: 24V DC – Estimated peak approx. 3kw
Solar: circa 3kW.
16kW 48v DC gen set.
The plan is to fit motor to a Yanmar sail drive SD25 and complete unit be retractable. This involves a wet lower tube and a watertight inner tube with hull closure plate below the prop – motor and sail drive leg fitted to this at their join. We should be able to couple motor shaft to SD25 upper gear box shaft with a coupler and bolt units together without too many modifications. Be great to hear of others experience with this.
We are trying to limit motor voltage to 48V – makes batteries & solar easier plus ability to share bank via DC C converters & battery for house loads at 24V.
The boat will be light and shallow draft = easily driven. A similar 62’ catamaran was fitted with 2 x OV SD15s and achieved over 9 knots in flat water so we believe 12 to 15kW motors will be adequate.
According to Vic Prop boat specs, twin 12kW (16hp) motors with RPM max of 2200 (2:1 gear reduction on SD25 so prop speed 1100 max.) & 3 blade 15" x 13" prop will yield a top speed of 8.92 kts which is fine.
We have looked at turn-key offerings from Bell marine, Oceanvolt & Electric yachts but none tick all our boxes so would like to have a crack at customizing our own solution.
Some motor options Ive stumbled across include:
1. Motenergy ME1302 or ME1616 Liquid cooled
2. Parker GVM210-100-DPW
3. Go cart or Elec motorcycle motors: Revolt, Zero, ???
Bearing in mind 48V supply and max RPM of around 2400, be grateful to get your thoughts on best motor and associated controller and any tips or constructive suggestions for our project.
|
Hi Rob, Not sure this will help you much but first off I envy your obvious budget. The boat pictures look great and I love the lifting concept. ? My Wife Monika and I bought a 1990 Catana 42 in 2013. The survey showed the boat was structurally sound but everything was very dated and neglected. I’ve helped build, worked on, and done deliveries on boats for over 40 years so I knew we could fix what needed to be done. We’ve had some surprises along the way but now after a 6+ year refit (1 winter in the water at Tampa Florida and 5.5 years on the hard in Saint Marys GA.(We do take summers off)), We are on our shakedown cruise in the Florida Keys. Timing sucked but It is a great place for us to be during this craziness. ? During the trip from The Georgetown Yacht Basin on the Chesapeake (where we bought her) to Tampa Bay FL, ?I caught a crab pot Off the tip of FL. and ended up breaking a CRANKSHAFT on the Port engine. During the research of looking for a replacement I came across Thunderstruck. After a bunch of emails, pricing, looking at the budget, and advice from some very knowledgeable friends, I decided to go with an electric motor for a Port side engine anyway. As this side is also the master stateroom side, getting diesel, oil, heat, and noise out seemed like a good thing. Even with AGM Lead acid batteries the estimated cost for the replacement was a bit less than a Beta Diesel. All up when finished I came in about even with the Beta cost and about 100 lbs. lighter. If I can ever afford LI Batts the weight will be even better. ? With The current system that ignored any attempt at getting more efficiency (budget project) the current 100 Amp hour bank will move the boat at about 4 knots for close to ? hour. More than enough to anchor, maneuver a bit, etc. We currently use the Starboard rust bucket 27 HP (when new) VP for longer distances as it will push us at 4 knots until it says enough for today, let me rest. The current draw for the electric to do that is over 100 amps per hour and I cannot put enough power back into the batteries with the chargers I have to keep that level of use happy. I can push the boat (we need to go on a couple thousand pound diet) at just over 2 knots with the Generator running without depleting the batteries. We’ve done this a couple times when the wind died and it seems to work well. Plus the NL Gen just sips fuel. ? So far I am extremely pleased with how things are working. ? The attached document shows the engine room. ? Good luck with your project. Cheers, Ric Sanders ? ? ? Ric Sanders Rsandersemail@... 1+562.505.7920 ?
|
Wow, What a project. If the motor end is watertight then it is airtight as well? I like the retractable drive concept. I manufactured submersible hydraulic systems for deep-sea construction. The electric power was a modified AC motor encased inside of an SS capsule. The cooling effect of beinf submerged allowed for very excessive over powering of the motor without over heating. The capsule was filled with a refrigeration oil used in sealed refrigeration systems. Yes, the oil does warm up while the motor is under a load. I used an air spring bladder as an accumulator that was caged so that a spring could preload the pressure and still allow for some expansion of the heated oil and then retract with a positive pressure when oil was cooling so there was never any negative pressure inside of the capsule. The motor drove a hydraulic pump that was also inside of the capsule with just a pressure outlet to the hydraulic tools and a low-pressure return inlet back to a reservoir and then back to the pump. You would need to think about using a brushless motor. Carbon brushes cast off carbon as they age which contaminates the oil. I guess the point is that sealing a motor for submersed use is pretty straight forward and does have the benefit of running a cool motor as well as beating the normal destruction of sea air and water and wet bilges. Electric boats are almost a cool as sailboats and then all in sleek composite Multihull. You got going for you man.?
another Rob
|
uhmm, forgive my intrusion here, but your criteria sound a bit optimistic.? Sorry if this view is off. I appreciate the optimism though.? I'll gladly sit back now and watch the other armchair engineers add their 2-cents worth, pro and con.? Love to see the discussion though.
Cheers,? ?
----- Original Message ----- From: Rob Cave <rob@...> To: [email protected]Sent: Sun, 19 Apr 2020 20:52:27 -0400 (EDT) Subject: [electricboats] 15kW electric motors for Sailing Catamaran
Greetings,
Reposting this topic the new group location with some photos. Hopefully some feedback or suggestions., Looking for advice on a 15kW 48V electric motors to fit to a Yanmar SD25 sail drive (new model of the SD20). Application is an under construction 52' sailing catamaran. Some broad boat parameters: Ocean going world cruising catamaran – composite epoxy structure. L 52’, Draft 2’ Weight approx. 8500kg / 19,000lb Full electric propulsion, galley and other services including hot water. Motors retractable: 2 x 15kw 48v + regen Battery bank: circa 16kw 48v House loads: 24V DC – Estimated peak approx. 3kw Solar: circa 3kW. 16kW 48v DC gen set. The plan is to fit motor to a Yanmar sail drive SD25 and complete unit be retractable. This involves a wet lower tube and a watertight inner tube with hull closure plate below the prop – motor and sail drive leg fitted to this at their join. We should be able to couple motor shaft to SD25 upper gear box shaft with a coupler and bolt units together without too many modifications. Be great to hear of others experience with this. We are trying to limit motor voltage to 48V – makes batteries & solar easier plus ability to share bank via DCC converters & battery for house loads at 24V. The boat will be light and shallow draft = easily driven. A similar 62’ catamaran was fitted with 2 x OV SD15s and achieved over 9 knots in flat water so we believe 12 to 15kW motors will be adequate. According to Vic Prop boat specs, twin 12kW (16hp) motors with RPM max of 2200 (2:1 gear reduction on SD25 so prop speed 1100 max.) & 3 blade 15" x 13" prop will yield a top speed of 8.92 kts which is fine. We have looked at turn-key offerings from Bell marine, Oceanvolt & Electric yachts but none tick all our boxes so would like to have a crack at customizing our own solution. Some motor options Ive stumbled across include: 1. Motenergy ME1302 or ME1616 Liquid cooled 2. Parker GVM210-100-DPW 3. Go cart or Elec motorcycle motors: Revolt, Zero, ??? Bearing in mind 48V supply and max RPM of around 2400, be grateful to get your thoughts on best motor and associated controller and any tips or constructive suggestions for our project.
--
Dan Hennis CTR Services P.O. Box 254 14237 FR 1155 Cassville, MO? 65625-0254 417-396-0228
|
Have you talked to thunderstruck motors in ca?
On Sunday, April 26, 2020, 05:17:24 AM PDT, DAN HENNIS <dhennis@...> wrote:
uhmm, forgive my intrusion here, but your criteria sound a bit optimistic.? Sorry if this view is off. I appreciate the optimism though.? I'll gladly sit back now and watch the other armchair engineers add their 2-cents worth, pro and con.? Love to see the discussion though.
Cheers,? ?
----- Original Message ----- From: Rob Cave <rob@...> To: [email protected]Sent: Sun, 19 Apr 2020 20:52:27 -0400 (EDT) Subject: [electricboats] 15kW electric motors for Sailing Catamaran
Greetings,
Reposting this topic the new group location with some photos. Hopefully some feedback or suggestions., Looking for advice on a 15kW 48V electric motors to fit to a Yanmar SD25 sail drive (new model of the SD20). Application is an under construction 52' sailing catamaran. Some broad boat parameters: Ocean going world cruising catamaran – composite epoxy structure. L 52’, Draft 2’ Weight approx. 8500kg / 19,000lb Full electric propulsion, galley and other services including hot water. Motors retractable: 2 x 15kw 48v + regen Battery bank: circa 16kw 48v House loads: 24V DC – Estimated peak approx. 3kw Solar: circa 3kW. 16kW 48v DC gen set. The plan is to fit motor to a Yanmar sail drive SD25 and complete unit be retractable. This involves a wet lower tube and a watertight inner tube with hull closure plate below the prop – motor and sail drive leg fitted to this at their join. We should be able to couple motor shaft to SD25 upper gear box shaft with a coupler and bolt units together without too many modifications. Be great to hear of others experience with this. We are trying to limit motor voltage to 48V – makes batteries & solar easier plus ability to share bank via DCC converters & battery for house loads at 24V. The boat will be light and shallow draft = easily driven. A similar 62’ catamaran was fitted with 2 x OV SD15s and achieved over 9 knots in flat water so we believe 12 to 15kW motors will be adequate. According to Vic Prop boat specs, twin 12kW (16hp) motors with RPM max of 2200 (2:1 gear reduction on SD25 so prop speed 1100 max.) & 3 blade 15" x 13" prop will yield a top speed of 8.92 kts which is fine. We have looked at turn-key offerings from Bell marine, Oceanvolt & Electric yachts but none tick all our boxes so would like to have a crack at customizing our own solution. Some motor options Ive stumbled across include: 1. Motenergy ME1302 or ME1616 Liquid cooled 2. Parker GVM210-100-DPW 3. Go cart or Elec motorcycle motors: Revolt, Zero, ??? Bearing in mind 48V supply and max RPM of around 2400, be grateful to get your thoughts on best motor and associated controller and any tips or constructive suggestions for our project.
--
Dan Hennis CTR Services P.O. Box 254 14237 FR 1155 Cassville, MO? 65625-0254 417-396-0228
|
First of all, wow, what an incredible daunting project. ?Do you have a website or info on the progression of your project?
Not really able to offer advice, however, I am working on the planning aspect converting my 44’ FP from ICE to electric. I’m now about 1 yr from conversion. But looking at around 10-12kw motors connecting to my existing sail drive. Based on conversations,
considering 20-25kwh bank. I also am planning around a 3kw solar array.?
Anyways looking forward to following the progress and direction you go.
toggle quoted message
Show quoted text
On Apr 19, 2020, at 5:23 PM, Rob Cave via groups.io <rob@...> wrote:
? Greetings,
Reposting this topic the new group location with some photos. Hopefully some feedback or suggestions.,
Looking for advice on a 15kW 48V electric motors to fit to a Yanmar SD25 sail drive (new model
of the SD20).
Application is an under construction 52' sailing catamaran.
Some broad boat parameters:
Ocean going world cruising catamaran – composite epoxy structure.
L 52’, Draft 2’ Weight approx. 8500kg / 19,000lb
Full electric propulsion, galley and other services including hot water.
Motors retractable: 2 x 15kw 48v + regen
Battery bank: circa 16kw 48v
House loads: 24V DC – Estimated peak approx. 3kw
Solar: circa 3kW.
16kW 48v DC gen set.
The plan is to fit motor to a Yanmar sail drive SD25 and complete unit be retractable. This
involves a wet lower tube and a watertight inner tube with hull closure plate below the prop – motor and sail drive leg fitted to this at their join. We should be able to couple motor shaft to SD25 upper gear box shaft with a coupler and bolt units together
without too many modifications. Be great to hear of others experience with this.
We are trying to limit motor voltage to 48V – makes batteries & solar easier plus ability
to share bank via DCC
converters & battery for house loads at 24V.
The boat will be light and shallow draft = easily driven. A similar 62’ catamaran was fitted
with 2 x OV SD15s and achieved over 9 knots in flat water so we believe 12 to 15kW motors will be adequate.
According to Vic Prop boat specs, twin 12kW (16hp) motors with RPM max of 2200 (2:1 gear reduction
on SD25 so prop speed 1100 max.) & 3 blade 15" x 13" prop will yield a top speed of 8.92 kts which is fine.
We have looked at turn-key offerings from Bell marine, Oceanvolt & Electric yachts but none
tick all our boxes so would like to have a crack at customizing our own solution.
Some motor options Ive stumbled across include:
1. Motenergy ME1302 or ME1616 Liquid cooled
2. Parker GVM210-100-DPW
3. Go cart or Elec motorcycle motors: Revolt, Zero, ???
Bearing in mind 48V supply and max RPM of around 2400, be grateful to get your thoughts on
best motor and associated controller and any tips or constructive suggestions for our project.
<20200420_090143.jpg>
<Elec Sail Drive - retraction system.jpg>
<20200420_085913.jpg>
<20200420_085941.jpg>
<20200420_085951.jpg>
<20200420_090015.jpg>
<20200420_090102.jpg>
|
It’s telling how many people are considering, planning or actually making the move to hybrid or pure electric! ?We are planning 2 x 12kW continuous, prob 48V, as parallel hybrids to our two 135hp diesels on straight shafts, 15+ kW lithium bank, 7-10kW solar array. This is on a 50’ x 16’ power catamaran displacing about 15 tonne.? If we can find someone to assist we’ll use the help, but otherwise will go DIY.
Always looking forward to hearing the progress of others!
toggle quoted message
Show quoted text
On 27 Apr 2020, at 1:24 pm, Steven Chmura <contact@...> wrote:
?
First of all, wow, what an incredible daunting project. ?Do you have a website or info on the progression of your project?
Not really able to offer advice, however, I am working on the planning aspect converting my 44’ FP from ICE to electric. I’m now about 1 yr from conversion. But looking at around 10-12kw motors connecting to my existing sail drive. Based on conversations,
considering 20-25kwh bank. I also am planning around a 3kw solar array.?
Anyways looking forward to following the progress and direction you go.
Steve
On Apr 19, 2020, at 5:23 PM, Rob Cave via groups.io <rob@...> wrote:
? Greetings,
Reposting this topic the new group location with some photos. Hopefully some feedback or suggestions.,
Looking for advice on a 15kW 48V electric motors to fit to a Yanmar SD25 sail drive (new model
of the SD20).
Application is an under construction 52' sailing catamaran.
Some broad boat parameters:
Ocean going world cruising catamaran – composite epoxy structure.
L 52’, Draft 2’ Weight approx. 8500kg / 19,000lb
Full electric propulsion, galley and other services including hot water.
Motors retractable: 2 x 15kw 48v + regen
Battery bank: circa 16kw 48v
House loads: 24V DC – Estimated peak approx. 3kw
Solar: circa 3kW.
16kW 48v DC gen set.
The plan is to fit motor to a Yanmar sail drive SD25 and complete unit be retractable. This
involves a wet lower tube and a watertight inner tube with hull closure plate below the prop – motor and sail drive leg fitted to this at their join. We should be able to couple motor shaft to SD25 upper gear box shaft with a coupler and bolt units together
without too many modifications. Be great to hear of others experience with this.
We are trying to limit motor voltage to 48V – makes batteries & solar easier plus ability
to share bank via DCC
converters & battery for house loads at 24V.
The boat will be light and shallow draft = easily driven. A similar 62’ catamaran was fitted
with 2 x OV SD15s and achieved over 9 knots in flat water so we believe 12 to 15kW motors will be adequate.
According to Vic Prop boat specs, twin 12kW (16hp) motors with RPM max of 2200 (2:1 gear reduction
on SD25 so prop speed 1100 max.) & 3 blade 15" x 13" prop will yield a top speed of 8.92 kts which is fine.
We have looked at turn-key offerings from Bell marine, Oceanvolt & Electric yachts but none
tick all our boxes so would like to have a crack at customizing our own solution.
Some motor options Ive stumbled across include:
1. Motenergy ME1302 or ME1616 Liquid cooled
2. Parker GVM210-100-DPW
3. Go cart or Elec motorcycle motors: Revolt, Zero, ???
Bearing in mind 48V supply and max RPM of around 2400, be grateful to get your thoughts on
best motor and associated controller and any tips or constructive suggestions for our project.
<20200420_090143.jpg>
<Elec Sail Drive - retraction system.jpg>
<20200420_085913.jpg>
<20200420_085941.jpg>
<20200420_085951.jpg>
<20200420_090015.jpg>
<20200420_090102.jpg>
|
Hi Steve/Rob,
Totally possible to use existing sail drives and add a motor on top. While doable its not trivial and at the end of the day, you may find its just better to go with something already on the market. The devil is in the details which may not be apparent at the onset. Another tricky aspect is getting the motor/reduction/prop just right for efficiency. Electric motors are most efficient near their upper rpm range, and props are most efficient when spinning slow. A typical motor may be anywhere from 4,000 to 10,000 RPM.? Once and awhile you will come across a motor designed to spin at low RPM's which are closer to prop RPM, they are generally big and heavy.?
As per the retractable drives, I'm betting you will keep them down most of the time. Regen on a cat can be significant due to the speed, if you don't need the regen and want to reduce drag, you can spin the props to match the speed of the boat and make the prop "invisible", that doesn't take much power at all.? And adding just a little more power will give you a nice little boost under sail. I find myself motor sailing most of the time, with an electric boat, there is almost no reason not to. Some may call it cheating.?
Matt Foley? Sunlight Conversions Perpetual Energy, LLC 201-914-0466
On Sunday, April 26, 2020, 11:24:49 PM EDT, Steven Chmura <contact@...> wrote:
First of all, wow, what an incredible daunting project. ?Do you have a website or info on the progression of your project?
Not really able to offer advice, however, I am working on the planning aspect converting my 44’ FP from ICE to electric. I’m now about 1 yr from conversion. But looking at around 10-12kw motors connecting to my existing sail drive. Based on conversations,
considering 20-25kwh bank. I also am planning around a 3kw solar array.?
Anyways looking forward to following the progress and direction you go.
On Apr 19, 2020, at 5:23 PM, Rob Cave via groups.io <rob@...> wrote:
? Greetings,
Reposting this topic the new group location with some photos. Hopefully some feedback or suggestions.,
Looking for advice on a 15kW 48V electric motors to fit to a Yanmar SD25 sail drive (new model
of the SD20).
Application is an under construction 52' sailing catamaran.
Some broad boat parameters:
Ocean going world cruising catamaran – composite epoxy structure.
L 52’, Draft 2’ Weight approx. 8500kg / 19,000lb
Full electric propulsion, galley and other services including hot water.
Motors retractable: 2 x 15kw 48v + regen
Battery bank: circa 16kw 48v
House loads: 24V DC – Estimated peak approx. 3kw
Solar: circa 3kW.
16kW 48v DC gen set.
The plan is to fit motor to a Yanmar sail drive SD25 and complete unit be retractable. This
involves a wet lower tube and a watertight inner tube with hull closure plate below the prop – motor and sail drive leg fitted to this at their join. We should be able to couple motor shaft to SD25 upper gear box shaft with a coupler and bolt units together
without too many modifications. Be great to hear of others experience with this.
We are trying to limit motor voltage to 48V – makes batteries & solar easier plus ability
to share bank via DCC
converters & battery for house loads at 24V.
The boat will be light and shallow draft = easily driven. A similar 62’ catamaran was fitted
with 2 x OV SD15s and achieved over 9 knots in flat water so we believe 12 to 15kW motors will be adequate.
According to Vic Prop boat specs, twin 12kW (16hp) motors with RPM max of 2200 (2:1 gear reduction
on SD25 so prop speed 1100 max.) & 3 blade 15" x 13" prop will yield a top speed of 8.92 kts which is fine.
We have looked at turn-key offerings from Bell marine, Oceanvolt & Electric yachts but none
tick all our boxes so would like to have a crack at customizing our own solution.
Some motor options Ive stumbled across include:
1. Motenergy ME1302 or ME1616 Liquid cooled
2. Parker GVM210-100-DPW
3. Go cart or Elec motorcycle motors: Revolt, Zero, ???
Bearing in mind 48V supply and max RPM of around 2400, be grateful to get your thoughts on
best motor and associated controller and any tips or constructive suggestions for our project.
<20200420_090143.jpg>
<Elec Sail Drive - retraction system.jpg>
<20200420_085913.jpg>
<20200420_085941.jpg>
<20200420_085951.jpg>
<20200420_090015.jpg>
<20200420_090102.jpg>
|
Hi Matt, I feel I’m in the easier boat :) in that we have straight shafts not sail drives.
So it’s relatively easy to put in a pillow block to account for shaft side pull, and attach the electric motor in parallel mode onto the shaft. The reduction comes from the relative size of the wheels the serpentine belts run on and 48v seems to allow about 89-90% efficiency motors. Our gearbox also can also freewheel according to the manufacturer, meaning a clutch isn’t needed to separate the diesel - we priced the Italian one and saved the money for the oxygen and drink needed for recovery!
I’m not sure the kW a serpentine belt can take/provide, but we’ll probably limit to 8kW per motor anyway for the speed we expect from electric and I think the belt can take that based on the large alternators that use them.? The other thing is that while the gearbox can freewheel, spinning it at 1600rpm (our expected electric speed) may not be best longterm! I don’t have an answer for that problem though, so would love some help!
Everything else - battery bank size and type, solar sizing, genset size, all just then can be done based on usage needs: for 8hr travel days with a 15kW usable battery and 8kW solar, a 15kW genset need only be on for 2 out of the 8 hours at 6kn. 24hr days is much harder and the best (least use of genset/diesel) I can get at 6kn is 12 out of the 24hrs on genset. Above 7.5kn it’s diesel-only time though - the benefits of a parallel hybrid!
Robert?
toggle quoted message
Show quoted text
On 27 Apr 2020, at 9:47 pm, Matt Foley <matt@...> wrote:
? Hi Steve/Rob,
Totally possible to use existing sail drives and add a motor on top. While doable its not trivial and at the end of the day, you may find its just better to go with something already on the market. The devil is in the details which may not be apparent at the onset. Another tricky aspect is getting the motor/reduction/prop just right for efficiency. Electric motors are most efficient near their upper rpm range, and props are most efficient when spinning slow. A typical motor may be anywhere from 4,000 to 10,000 RPM.? Once and awhile you will come across a motor designed to spin at low RPM's which are closer to prop RPM, they are generally big and heavy.?
As per the retractable drives, I'm betting you will keep them down most of the time. Regen on a cat can be significant due to the speed, if you don't need the regen and want to reduce drag, you can spin the props to match the speed of the boat and make the prop "invisible", that doesn't take much power at all.? And adding just a little more power will give you a nice little boost under sail. I find myself motor sailing most of the time, with an electric boat, there is almost no reason not to. Some may call it cheating.?
Matt Foley? Sunlight Conversions Perpetual Energy, LLC 201-914-0466
On Sunday, April 26, 2020, 11:24:49 PM EDT, Steven Chmura <contact@...> wrote:
First of all, wow, what an incredible daunting project. ?Do you have a website or info on the progression of your project?
Not really able to offer advice, however, I am working on the planning aspect converting my 44’ FP from ICE to electric. I’m now about 1 yr from conversion. But looking at around 10-12kw motors connecting to my existing sail drive. Based on conversations,
considering 20-25kwh bank. I also am planning around a 3kw solar array.?
Anyways looking forward to following the progress and direction you go.
Steve
On Apr 19, 2020, at 5:23 PM, Rob Cave via groups.io <rob@...> wrote:
? Greetings,
Reposting this topic the new group location with some photos. Hopefully some feedback or suggestions.,
Looking for advice on a 15kW 48V electric motors to fit to a Yanmar SD25 sail drive (new model
of the SD20).
Application is an under construction 52' sailing catamaran.
Some broad boat parameters:
Ocean going world cruising catamaran – composite epoxy structure.
L 52’, Draft 2’ Weight approx. 8500kg / 19,000lb
Full electric propulsion, galley and other services including hot water.
Motors retractable: 2 x 15kw 48v + regen
Battery bank: circa 16kw 48v
House loads: 24V DC – Estimated peak approx. 3kw
Solar: circa 3kW.
16kW 48v DC gen set.
The plan is to fit motor to a Yanmar sail drive SD25 and complete unit be retractable. This
involves a wet lower tube and a watertight inner tube with hull closure plate below the prop – motor and sail drive leg fitted to this at their join. We should be able to couple motor shaft to SD25 upper gear box shaft with a coupler and bolt units together
without too many modifications. Be great to hear of others experience with this.
We are trying to limit motor voltage to 48V – makes batteries & solar easier plus ability
to share bank via DCC
converters & battery for house loads at 24V.
The boat will be light and shallow draft = easily driven. A similar 62’ catamaran was fitted
with 2 x OV SD15s and achieved over 9 knots in flat water so we believe 12 to 15kW motors will be adequate.
According to Vic Prop boat specs, twin 12kW (16hp) motors with RPM max of 2200 (2:1 gear reduction
on SD25 so prop speed 1100 max.) & 3 blade 15" x 13" prop will yield a top speed of 8.92 kts which is fine.
We have looked at turn-key offerings from Bell marine, Oceanvolt & Electric yachts but none
tick all our boxes so would like to have a crack at customizing our own solution.
Some motor options Ive stumbled across include:
1. Motenergy ME1302 or ME1616 Liquid cooled
2. Parker GVM210-100-DPW
3. Go cart or Elec motorcycle motors: Revolt, Zero, ???
Bearing in mind 48V supply and max RPM of around 2400, be grateful to get your thoughts on
best motor and associated controller and any tips or constructive suggestions for our project.
<20200420_090143.jpg>
<Elec Sail Drive - retraction system.jpg>
<20200420_085913.jpg>
<20200420_085941.jpg>
<20200420_085951.jpg>
<20200420_090015.jpg>
<20200420_090102.jpg>
|
Check out Lee Wheelbarger did an amazing job converting that trimaran to solar and has done quite a lot of cruising with it.? Several years ago he announced a solar boat challenge/race to be held in Florida, but that didn’t happen.? Looks like they have a lot of Sunpower panels now on the top. I don’t know offhand the KW, KWH or other ratings. Check it out. -MT ?
toggle quoted message
Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of Robert McArthur
Sent: Sunday, April 26, 2020 9:42 PM
To: [email protected]
Subject: Re: [electricboats] 15kW electric motors for Sailing Catamaran? It’s telling how many people are considering, planning or actually making the move to hybrid or pure electric! ?We are planning 2 x 12kW continuous, prob 48V, as parallel hybrids to our two 135hp diesels on straight shafts, 15+ kW lithium bank, 7-10kW solar array. This is on a 50’ x 16’ power catamaran displacing about 15 tonne.? If we can find someone to assist we’ll use the help, but otherwise will go DIY. Always looking forward to hearing the progress of others! Robert
On 27 Apr 2020, at 1:24 pm, Steven Chmura <contact@...> wrote:
? First of all, wow, what an incredible daunting project. ?Do you have a website or info on the progression of your project? Not really able to offer advice, however, I am working on the planning aspect converting my 44’ FP from ICE to electric. I’m now about 1 yr from conversion. But looking at around 10-12kw motors connecting to my existing sail drive. Based on conversations, considering 20-25kwh bank. I also am planning around a 3kw solar array.? Anyways looking forward to following the progress and direction you go. Steve
On Apr 19, 2020, at 5:23 PM, Rob Cave via groups.io <rob@...> wrote:
?Greetings, Reposting this topic the new group location with some photos. Hopefully some feedback or suggestions., Looking for advice on a 15kW 48V electric motors to fit to a Yanmar SD25 sail drive (new model of the SD20). Application is an under construction 52' sailing catamaran. Some broad boat parameters: Ocean going world cruising catamaran – composite epoxy structure. L 52’, Draft 2’ Weight approx. 8500kg / 19,000lb Full electric propulsion, galley and other services including hot water. Motors retractable: 2 x 15kw 48v + regen Battery bank: circa 16kw 48v House loads: 24V DC – Estimated peak approx. 3kw Solar: circa 3kW. 16kW 48v DC gen set. The plan is to fit motor to a Yanmar sail drive SD25 and complete unit be retractable. This involves a wet lower tube and a watertight inner tube with hull closure plate below the prop – motor and sail drive leg fitted to this at their join. We should be able to couple motor shaft to SD25 upper gear box shaft with a coupler and bolt units together without too many modifications. Be great to hear of others experience with this. We are trying to limit motor voltage to 48V – makes batteries & solar easier plus ability to share bank via DCC converters & battery for house loads at 24V. The boat will be light and shallow draft = easily driven. A similar 62’ catamaran was fitted with 2 x OV SD15s and achieved over 9 knots in flat water so we believe 12 to 15kW motors will be adequate. According to Vic Prop boat specs, twin 12kW (16hp) motors with RPM max of 2200 (2:1 gear reduction on SD25 so prop speed 1100 max.) & 3 blade 15" x 13" prop will yield a top speed of 8.92 kts which is fine. We have looked at turn-key offerings from Bell marine, Oceanvolt & Electric yachts but none tick all our boxes so would like to have a crack at customizing our own solution. Some motor options Ive stumbled across include: 1. Motenergy ME1302 or ME1616 Liquid cooled 2. Parker GVM210-100-DPW 3. Go cart or Elec motorcycle motors: Revolt, Zero, ??? Bearing in mind 48V supply and max RPM of around 2400, be grateful to get your thoughts on best motor and associated controller and any tips or constructive suggestions for our project. <Elec Sail Drive - retraction system.jpg>
|
Ric Sanders