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Naive newbie questions
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Hi!
I'm a new owner of a 27 foot ~4800 pounds displacement sailing boat with a struggling Yanmar 80's diesel engine. I'm already tired of the smell, leaks and continous breaking and am super keen on going electric. So this is just for feasability. I'm a total newbie to electrics, other than a little work I've done on my 12v motorcycle . While I try to keep my diesel working through the season, would it make sense to order a lets say 2000w or 3000w brushless motor kit from China? For example: Get it home and start tinkering together with a 12v battery as a learn by doing-experience. Is it possible to figure it out as you go with googling? Considering the low cost. And if I figure it out, order the right speed and reverse controller for a boat and lift out the diesel. Thanks |
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Go to ?- they are reputable dealers for everything you need. I purchased 2 sets - 48v/10kW water-cooled PMAC motors, Sevcon Gen4 controllers and their motor mount/reduction pulley system. All were easily installed and working just fine. For your application, aid-cooled motors are OK.? I’ve had good luck buying directly from China on AliExpress.com - so you may be fine buying direct.? |
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Thanks for replying
Thunderstruck looks great but I'm on a budget and the sailboat is not worth a lot. I would happily go with thunderstruck for a bigger boat I could see myself having for 5-10 years. LFP batteries would be nice but wouldn't like 20ah 48v mobility scooter lead acid batteries be fine for light use? |
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That motor and parts seems perfect for what you want to do. Good price, all installation parts supplied just mount and connect to drive shaft, plug in all the controls, connect up to battery and away you go.
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开云体育On 2021-05-09 4:26 pm, davidfornborg@... wrote:
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Dan Pfeiffer On 2021-05-09 4:26 pm, davidfornborg@... wrote:
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dfornis
On Mon, May 10, 2021 at 03:41 PM, Dan Pfeiffer wrote:
20AH lead acid (which means 10AH of usable capacity) will run your motor at 1000 watts for maybe 20 minutes?? Might be enough for your needs but stay far away from trouble (like a lee shore).??Alright! I would need to double that then at least. But I'd have to plan so that I can start out with a smaller set of batteries in paralell 48v and be able to scale up from there. Thanks for the link, it's a great resource. I wish I had a "sharp analytical approach" but realistically I have a "good enough" and learn-by-doing kind of approach. |
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There have been links to Lifepo4 batteries on this list that are effectively cheaper than lead acid when you consider you only need half the capacity. Also bigbattery.com just had some 36v packs that were incredibly cheap. I would check out those before buying lead acid. On May 10, 2021, at 9:02 AM, dfornis <davidfornborg@...> wrote: On Mon, May 10, 2021 at 03:41 PM, Dan Pfeiffer wrote: 20AH lead acid (which means 10AH of usable capacity) will run your motor at 1000 watts for maybe 20 minutes?? Might be enough for your needs but stay far away from trouble (like a lee shore).??Alright! I would need to double that then at least. But I'd have to plan so that I can start out with a smaller set of batteries in paralell 48v and be able to scale up from there. Thanks for the link, it's a great resource. I wish I had a "sharp analytical approach" but realistically I have a "good enough" and learn-by-doing kind of approach. |
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Watch that I read 72 vdc. The kw looks a little low. Let us know. Good luck
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My 2 cents: 1.? Smaller motors are more likely to overheat.? Larger motors have more mass and convert more of the energy to torque.? You can offset this limitation a little by using higher voltage.? That's a trick that manufacturers do to save money:? use an undersized motor at a higher voltage.? Since most scooter and bike motors are sized at 48VDC, this scooter motor is already probably undersized for a scooter.? Trying to?power your 27ft sailboat with it is pushing that limitation even further, and I think you are going to find out it is severely undersized. 2. Stick with 48VDC for safety reason since you are not an expert with electricity.? Even people who are experts usually go with 48VDC.?? 3.? Since you are interested in experimenting and learning, I recommend trying to find a DC electric motor in a junkyard or something from a forklift?or golf cart.? There are lots of youtube videos of people who have installed cheap used motors and lead acid batteries.? When you are on a budget you can make it work with some tinkering, but remember you don't have a parking lot out there, so make sure you do your experiments at the dock and when you go out, have a plan for what happens if you break down.?? 4.? If you decide to go with a kit, I'll share my experience about Thunderstruck:? I have a 37ft sailboat and have a 10kW Thunderstruck kit.? I had selected the motor and controller before knowing about Thunderstruck, and was pricing it all out and getting ready to order when I found Thunderstruck's website and realized they had all the same components?I was looking for in a kit that didn't cost much more than the individual parts, AND it came with the wiring harness, instructions, AND the controller was already programmed.? I've been very happy with the outcome and with the help I got from them.? For your boat you might be able to get away with the 5kW motor.? The scooter motor though is probably going to be a waste of your money and not worth it in my opinion. Good luck and let us know how it goes. Darin |
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These are all very good points! Thanks for sharing !! My system based on the go cart kit works for me because as a day sailerl I truly just use it to go in and out of the slip for the last couple of years it's works . I would definitely think about a system like thunderstruck for anything more than that. On Wed, May 12, 2021, 7:31 PM Darin <armyofpenguins@...> wrote:
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Darin:
Those are some great points. I agree with you, after doing some more research, that these motors are probably not suited for sustained 3kw output. They cheap out by providing a controller that will only do ~2kw at 48v. But still, that might be enough if it's only about getting in and out of the slip and perhaps motoring a bit in calm weather. We don't really have any tides to fight where I sail. Thanks for sharing your thoughts. Phil: Are you saying that you have a go cart-kit installed that works for you? What kind of boat do you have and what's your battery setup? :-) So theoretically if I remove my Yanmar engine, I'm guessing I will end up detaching the propeller shaft from its gearbox. The shaft is 25mm from what I can tell. What kind of sprocket would I fit on the shaft and will it have the same keyway? I've read that the gearing should be 2:1 so that if the engine sprocket is 8t I would be looking for a 16t sprocket for the propeller shaft, is that right? |
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If you'd like a little more or a little less power, push that number up or down a bit.? You now have an estimate for the power of the electric motor you'll need.? Others have commented on how some options might not be powerful enough; now that's quantified.? Next, consider the shaft rpm of your YSM8 when it's running at full tilt.? Find a motor that can deliver that speed while under full load, scheme up a gear system to speed it up or slow it down, or anticipate exchanging the propeller with one that's suitable for the new shaft speed.
As for your electricity source, I suggest you consider LiFePO4 batteries.? Bioenno Power is one vendor; they offer a lot of information that explains? LiFePO4's advantages relative to deep-cycle lead acid.? However, there are other vendors of LiFePO4 batteries that charge much less (i.e. a half or a third!) for the batteries themselves, though they might not have the customer service attitude or reputation of BP.? Compute your cost for both options, considering all factors, including what fraction of the battery's stated capacity is actually usable.? Figure out how long you want your motor to operate in normal use, and plan the battery purchase accordingly.? For emergency use, I suggest you keep a small outboard motor with fuel on hand.? That will be less expensive than sizing your battery bank for the worst emergency situation that you wish to be ready for. Let us know what you learn and how it goes! Halden |
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Yes the motor is from a go-kart kit you can get on eBay Amazon Alibaba 1800 w I did upgrade the controller so that I could get full power in reverse and for the last 2 years I've been running that to get in and out of the slip help me when I'm not quite balanced to make the turn. The initial deal card kit included the throttle controller and the motor and it was about $130. I upgraded the controller using a new Yang King model.? On Fri, May 14, 2021, 11:46 AM dfornis <davidfornborg@...> wrote: Darin: |
Reuben Trane
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