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Good morning, Group Does anyone know of a reasonable source for an azimuthing thruster in the 50hp range? I’m investigating adding an electric azimuthing thruster to a 100+/- ton canal barge. primary hull cross-section is flat bottom, bluff sides. LWL is about 27m (88-feet). Goal is to achieve 6-8 km/hr (say max 4.5 knots) under electric but to also provide the functionality of a stern thruster. She’s a cruiser, not a commercial venture, so 30km runs under electric would be enough; but that a battery bank sizing issue, not a thruster procurement issue... Currently have a 60 hp genset on board. If this plays out, would need to add a large battery bank as well. Vessel is in Northern Europe. Local-ish supply would be handy. Thanks! -Rob

i am a marine service company in mexico wishing help in converting a 40 foot trimaran from diesel to electric propulsion. Garth Jones. I need some help and advice

My first time on this wonderful info site. I thought my project would be easy. Mothership sailboat has 1k solar power with a 3k Victron inverter Charger powering the usual refer, autopilot, dc water maker and the like. House bank is 800 Ah. She has a Honda 2000 generator but I would dearly want not have to use it. With typical use and southern California/Mexico daylight and uniaxis pv tilt I hit float usually by mid day or so. I want my house bank to never dip below 50% DOD. I want componentry to see the house floating and send remaining power to a separate dedicated inverter??? To power the 120 v charger to drive 200 Ah lithium battery onboard the ding?... Echo charger relay??? I want rapid as possible charging of the dingy battery so I might use the 800 watt dingy motor for 2 hours every day. Any ideas ladies and gentlemen?

Does anyone have any idea how I could find out what plugs come on the Torqeedo 2R and 4R motors? Thanks! John

The following scenario is a "what ifffff" for a "trawler" class cruising boat. These boats are generally powered by old diesel engines - typically 120-275HP each (twin engines). If the diesel engines died for whatever reason, could I replace them with some kind of electric motors, and run the electric motors from the still working generator? I'd still be burning some kind of fuel, but I'd be rid of two large diesel engines (that I might not be able to get repaired). Here are the specs for the boat: Length: 38' Beam: 13.6' Draft: 3.6' Weight: 21,000 pounds Semi-displacement hull. Props: 2, bronze, 24"x26" Gear ratio (if the transmission was kept) - 2.5 Hull speed for the boat should be about 9.5mph Here are the readings that were taken during a survey of the boat (RPM's for both motors): 700 RPM 3.3MPH 1000 RPM 5.6MPH 1500 RPM 7.5MPH 2000 RPM 8.8MPH 2500 RPM 9.25MPH The current generator on the boat was a 7.6KW. If I wanted to be able to attain a max speed of 7.5MPH, at about 1500RPM for each motor, with 24"x26" props, how big would the electric motors need to be? Can I drive each motor on 3KW or less? Can this be done practically?? Thanks, John

The early Electric Paddle outboards used model airplane propellers, and the current models use props very like those on model airplanes: http://www.electricpaddle.com/ Company founder Joe Grez did the entire 2019 Salish 100 using nothing but solar power: https://flic.kr/p/2gB9w6t https://flic.kr/p/2gGQwZm The trouble with putting better props on trolling motors is that the submerged motor blocks a big part of the center of the prop... A friend of mine got a couple of these plastic emergency props to try on his twin 80 lb. thrust trolling motor drive, but the clearance under his boat is so small he'll have to trim the diameter quite a bit: https://www.ebay.com/p/10017019564 I think Merc has discontinues these... -- John <jkohnen@...> Winter, a lingering season, is a time to gather golden moments, embark upon a sentimental journey, and enjoy every idle hour. (John Boswell)

Hi I've recently finished my conversion of a 29 Roberts 4.5 ton yacht. 1200 watt panels 270 Ah batteries at 48 volt 15s3p Batrium BMS My usage stats are Rpm. Amp. Knots 530. 57 500. 44. 3.5 475. 38. 3.2 450. 31. 3.2 400. 25 420. 30 410. 28. 2.4 250 rpm 6 amp 400 rpm 24 amp 450 rpm 35 amp 580 rpm 63 amp 680 rpm 95 amp We replaced a 20hp bukh diesel and left the prop and shaft as is. Max rpm of the diesel was 2500 with a 2.5:1 reduction ratio, so max1000 rpm on the 2 bladed 400mm diameter prop. Direct drive, no gear reduction. Good shaft alignment can be easily rotated by hand. Easy to get cavitation if you rev up too fast. After 20 min at 500 rpm the 120 frame AC motor reaches 80 degrees Celsius and after 40 min 120 degrees Celsius. There is sufficient ventilation. The KAC 600 amp max 72 volt Kelly controller 8080I reaches 92 degrees after 30min and reduces high rpm to around 500 rpm and keeps them there remaining at 92 degrees Celsius. Has anybody had a similar problem and found a good solution? I'm not interested in cooling. I want to understand why the motor overheats at 2.5kW when it is designed to run at 4kW all day. Thank you all for your awesome inspiration over the years. Your posts have been really helpful. Cheers Mich

Hi there, I don't think I have posted before so I thought I would post with my thoughts on solar electric boats which I have one of. It is a 18' wood strip based on an old design from the last century called a "Disappearing Propeller boat". My experience with my solar electric boat has been that solar electric powered boats make perfect sense if you want to go more on the slow side such as 6 m/hr (10km'hr). I have found the optimal speed for my boat is 5m/hr (8 km/hr) but my boat design is a displacement hull with a hull speed of about 6.8 m/hr (11 km/hr). As I start to increase the speed from slow to fast the current draw goes up exponentially. If I maintain my cruising speed of 5 m/hr I can travel all day if it is sunny. I have a Torqeedo 2.0 Cruise motor, 221 amp hr battery bank (lead acid golf cart batteries) and 860 watts of flexible solar panels on the canopy. I can travel for 8 hours, stop for the night and while I am stopped the batteries keep charging so in the morning I am at least in the 95% state of charge. If I have a cloudy day I simply reduce my speed and I will draw exponentially less power. I have used this management of battery power for some major trips, one of which I was out for 16 days and solely relied on solar power. I am now building a catamaran 18' long and the plan is to power it by a 20HP motor. I am thinking of an Elco which is just under 9KW. For this configuration I would be into a very large battery bank minimum 16 KW and I could put 1800 watts of solar power to assist. But the solar production for this arrangement would no longer do very much and to recharge the bank would take a couple of days at least. So my thinking is still cruise at a slow speed perhaps 7.5 to 8.5 m/hr (12 to 14 km/hr) but have the option to go fast when required. It all will come down to battery management. Here is a link to my channel where I have documented my trips. Regards Phil Hi there, my experience with my solar electric boat has been that solar electric powered boats make perfect sense if you want to go more on the slow side such as 6 m/hr (10km'hr). I have found the optimal speed for my boat is 5m/hr (8 km/hr) but my boat design is a displacement hull with a hull speed of about 6.8 m/hr (11 km/hr). As I start to increase the speed from slow to fast the current draw goes up exponentially. If I maintain my cruising speed of 5 m/hr I can travel all day if it is sunny. I have a Torqeedo 2.0 Cruise motor, 221 amp hr battery bank (lead acid golf cart batteries) and 860 watts of flexible solar panels on the canopy. I can travel for 8 hours, stop for the night and while I am stopped the batteries keep charging so in the morning I am at least in the 95% state of charge. If I have a cloudy day I simply reduce my speed and I will draw exponentially less power. I have used this management of battery power for some major trips, one of which I was out for 16 days and solely relied on solar power. I am now building a catamaran 18' long and the plan is to power it by a 20HP motor. I am thinking of an Elco which is just under 9KW. For this configuration I would be into a very large battery bank minimum 16 KW and I could put 1800 watts of solar power to assist. But the solar production for this arrangement would no longer do very much and to recharge the bank would take a couple of days at least. So my thinking is still cruise at a slow speed perhaps 7.5 to 8.5 m/hr (12 to 14 km/hr) but have the option to go fast when required. It all will come down to battery management. Here is a link to my channel where I have documented my trips. Regards Phil https://www.youtube.com/channel/UCPOQj6FzLWQRB9zLOnFYmIg/playlists?view_as=subscriber

Since the day before yesterday I'm no longer able to open the Website electricboatassociation.org "No connection with the server". Is this my experience only? Günter

I would like to retrofit a higher pitch propeller on my 86# thrust trolling motor for a light weight (165# hull) semi-planing boat that is designed to go about 2X hull speed with very low thrust. I have seen reference to the RC plane pusher props, but I am not convinced that the surface area and strength is robust enough for water applications. The Navy 3.0 two bladed propeller, N3-LU05-00, is within 0.1" of the diameter of my trolling motor and probably a little more than twice the pitch (10.2 × 6.73 inch). The trolling motor RPM is 1,800 with no load, which is 500 less than the Navy 3.0 specification. Examing the pictures, it looks like a good candidate. Prior to spending the $50 plus shipping, it would be helpful to know if the propeller will fit. The key measurements are the maximum hub diameter, shaft diameter, and the shaft length inside the hub from the pin to the front face. I am also interested in alternative solutions or ideas... The trolling motor is a brushed DC motor, so I believe there is no change in performance for clockwise vs counterclockwise rotation. The wires are easily reversed on the output of the speed selector switch and the speed resistors are not sensitive to polarity. I will also compare the current draw with the stock propeller vs the retrofitted propeller to prevent damage to the trolling motor.

Thinking more about it - connecting a power supply to a battery (especially a high current lithium battery) could be bad from both directions: 1) If the battery voltage is LOW, then there would be potential for a huge "spark" when they're connected. 2) Depending on the design of the power supply - if the battery voltage is still HIGHER than the power supply, would you blow up the final stage of the power supply. Maybe at least a fuse, a BIG diode, and possibly even a current limit resistor? But then you're getting back to something that might look a little more like a dumb charger? So, what's the best way to set up a hybrid configuration with a generator, a charger, battery, and motor? Option 1) Are there good 10-20A 48V battery chargers available at a reasonable price (no more than $300? is that unrealistic?) so that the generator could drive the battery charger, and the battery charger would charge the battery while powering the motor? Can the charger handle having a motor draining the battery as fast as the charger is dumping current into it? Option 2) A different way to run off the generator might be to run the generator into a 20A 48V switching power supply, and drive the motor directly from the switching power supply, with no battery connected. In that configuration - when you went from battery power to generator, the motor would switch entirely to run off the generator; the battery would be switched out, and charged (maybe in parallel to the power supply driving the motor) separately. Option 3) Would it work to have the generator drive the 20A switching power supply into a MPPT charge controller that fed the battery - then leave the motor connected to the battery? Thoughts? John

Haven't had much of a change to go full throttle yet except pier side. Previous owner passed away and the boat was for sale about 4.5years. I've been going through it and tending to a hit list of stuff. With that being said I have gone full throttle pier side and rocked the boats next dock over. I did see /hear some cavitation. Not sure if it's effected by being tied up and boat not moving. FYI I have a 13x14rh prop. It's shot, replacing with 14x12rh. No reasoning behind different sizing other than it in new old stock and cheap..? John

Amazing new electric boat motor based on fish fins - Plugboats https://plugboats.com/amazing-new-electric-boat-motor-based-on-fish-fins/ Ken G. Brown

Does anyone have the results of the Wye Island Challenge for 2018 and 2019? Thanks! -Terry

G'day All: I was reminded that I had been a member of this group when I saw the notification of the move to groups.io. I had browsed the original Yahoo group a while back when contemplating building a solar boat. We did build "River Snail (notopala solaris)" and I can report that we cruised her successfully down the navigable length of the Australia's Murray River during November / December 2017, a distance of just over 1900km taking us 6 weeks, completely under solar power. If anyone is interested, further details are available in the blog at www.riversnail.wordpress.com <http://www.riversnail.wordpress.com> . Have fun, Dave

Yeah, now you have a taste of what Moses must have felt like when they formed up to leave Egypt. I am a member of several groups bailing on Yahoo. Looks to me like they are going to loose a lot more than what they thought they thought they were going to gain. On one of my groups, there were 80+ moves in one day. Now imagine that times the thousands of groups they were hosting. Sure glad I don't own stock in that company... Dan H

I’m pretty sure the 18” diameter two bladed pitch 9 prop that the 16hp diesel turned on my 30’ O’day is not ideal for my 10KW Thunderstruck motor and 2:1 reducer. Does anyone have advice for what will work? thanks to all those more technically adept who maintained the Yahoo site and moved it here. Tom Stein Santa Rosa Beach, Fl

I've been involved in intense discussions with the Electric Boat Association today, and we have unanimously agreed to back the migration of this group into Io groups, if that is what you all want. The advantage we have is that we are the oldest not-for-profit electric boat groups around, and we have proper official stuff like a bank account and so on: so it will be in safe hands. This has all been a bit of a rush, but the EBA absolutely supports this group, and we will help all we can , including with hard cash. However, we do need to form a group of moderators to run it: this is YOUR group, not ours, so I am looking for volunteers willing to help run the new group to stand forward. In the long run we need a sustainable business model, but that can wait for now. Lets just do it! I do need you to put your name on the line below if you want to help with this process. We need a volunteer team of Mods. More about us here: https://www.electricboatassociation.org/

The move to eba may make it possible for me to again access the group. I cancelled my yahoo email account several years ago because I had a really bad feeling about yahoo which now seems to be justified.. Luckily I've been able to see the topics forwarded to my gmail account. Facebook is even worse than the complaints mentioned BUT.. some of the groups are quite good. I've made friends and found lost friends. If we value privacy above all else, we shouldn't even be online. Best wishes for the entire project and hats off to the migration squad.

One thing that I notice when I visit the EBA site is that there is absolutely noting relating to sailing which kind of surprises me considering the interest in this list. Am I missing something?