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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 ½ 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
1+562.505.7920
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.
--
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.
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You may not get much of an answer in this group. Yahoo Groups is shutting down some of their functionality so the group has been moved to https://groups.io/g/electricboats electricboats@groups.io.
Guess I forgot to unsubscribe from this one.
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I am a new member and am considering the build of a small wooden electric powered launch. I have in mind a 15 foot Selway Fisher design intended for steam power. Steam machinery tends to be heavy and low powered which would make it suitable for battery electric power. I am looking at Thunderstruck motors for supply of machinery. Batteries will probably be sealed gel cells unless the price of lithium cells come down a whole heap.
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