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Search took 0.00 seconds. Search: Posts Made By: Scout 30
Forum: Engines and Propulsion Systems 29-12-2015, 13:32
Replies: 241
Views: 26,660
Posted By Scout 30
Re: Tug of War - Electric vs Diesel

That doesn't sound good.
Forum: Engines and Propulsion Systems 29-12-2015, 12:11
Replies: 241
Views: 26,660
Posted By Scout 30
Re: Tug of War - Electric vs Diesel

I shot Elco an email & asked them to join in this thread. We'll see what happens.
Forum: Engines and Propulsion Systems 29-12-2015, 11:52
Replies: 241
Views: 26,660
Posted By Scout 30
Re: Tug of War - Electric vs Diesel

I believe they are basing their numbers on 9 batteries & the biggest AH batteries they sell are 255 AH so it looks like the 5 hour range on batteries alone is unrealistic. In the hybrid mode they...
Forum: Engines and Propulsion Systems 29-12-2015, 10:02
Replies: 241
Views: 26,660
Posted By Scout 30
Re: Tug of War - Electric vs Diesel

While I am clearly not an electrical expert you clearly are what is your take on Elco's EP-4000 numbers? I know there are a lot of variables but generally speaking do they make sense to you based on...
Forum: Engines and Propulsion Systems 29-12-2015, 09:47
Replies: 241
Views: 26,660
Posted By Scout 30
Re: Tug of War - Electric vs Diesel

Point taken. I'll use AH from now on.
Forum: Engines and Propulsion Systems 29-12-2015, 09:40
Replies: 241
Views: 26,660
Posted By Scout 30
Re: Tug of War - Electric vs Diesel

Good point, flashlight batteries are probably not the way to go. Seriously though, I'm not trying to design a system here. Elco has already done that. I'm just saying what their system consists of...
Forum: Engines and Propulsion Systems 29-12-2015, 07:29
Replies: 241
Views: 26,660
Posted By Scout 30
Re: Tug of War - Electric vs Diesel

I run 4 Trojan T-105s for a house bank so I get that it doesn't have to be 9 12v batteries. I've lusted after Rolls Royce batteries for many years. It looks like, as LI batteries become more...
Forum: Engines and Propulsion Systems 29-12-2015, 06:39
Replies: 241
Views: 26,660
Posted By Scout 30
Re: Tug of War - Electric vs Diesel

Elco states that the efficiency of their motors is 85% to 92%. As I understand it the loss is primarily due to heat creation. If a diesel looses 35% of it's power to heat & an electric motor loses...
Forum: Engines and Propulsion Systems 29-12-2015, 05:57
Replies: 241
Views: 26,660
Posted By Scout 30
Re: Tug of War - Electric vs Diesel

I used a conversion program.

Measurement unit conversion: gallon (https://www.convertunits.com/from/gallon+)[U.S.]+of+diesel+oil/to/horsepower+hour

This site says diesels burn 1 gallon for...
Forum: Engines and Propulsion Systems 29-12-2015, 05:43
Replies: 241
Views: 26,660
Posted By Scout 30
Re: Tug of War - Electric vs Diesel

I'm no expert but I think the voltage of the batteries has to equal the voltage of the motor. Of course different batteries provide more or less amps but if you have a 24 volt motor you would need...
Forum: Engines and Propulsion Systems 28-12-2015, 07:53
Replies: 241
Views: 26,660
Posted By Scout 30
Re: Tug of War - Electric vs Diesel

Maybe Elco's numbers are wildly inaccurate. I'm not affiliated & I'm sure no expert, I just want it to work because I think silent propulsion would be cool as hell. The size of the battery bank is...
Forum: Engines and Propulsion Systems 28-12-2015, 05:13
Replies: 241
Views: 26,660
Posted By Scout 30
Re: Tug of War - Electric vs Diesel

Based on the info on the Elco site: The Elco EP-4000 (40hp) has a max continuous rating of 17kw so you'd be using closer to 15kw than 35kw. With a 5.5 KW generator you could run for 2 days non-stop....
Forum: Engines and Propulsion Systems 19-12-2015, 13:20
Replies: 241
Views: 26,660
Posted By Scout 30
Re: Tug of War - Electric vs Diesel

Do you have any evidence, or have you heard, that the Elco systems are not reliable? I'd be surprised by that considering how long they've been in business.
Forum: Engines and Propulsion Systems 18-12-2015, 16:30
Replies: 241
Views: 26,660
Posted By Scout 30
Re: Tug of War - Electric vs Diesel

Weight would not be an issue for the typical monohull but I'm not sure about cats. More batteries but less fuel. In terms of reliability the motor has it's first scheduled service at 50,000 hours. ...
Forum: Engines and Propulsion Systems 18-12-2015, 13:20
Replies: 241
Views: 26,660
Posted By Scout 30
Re: Tug of War - Electric vs Diesel

The issue is not diesel range, it's EP range.
Forum: Engines and Propulsion Systems 18-12-2015, 12:20
Replies: 241
Views: 26,660
Posted By Scout 30
Re: Tug of War - Electric vs Diesel

I was referring more to range & speed estimates. The implication has been that the range for electric power is inadequate because you can carry enough diesel to run at full power for extended...
Forum: Engines and Propulsion Systems 18-12-2015, 07:54
Replies: 241
Views: 26,660
Posted By Scout 30
Re: Tug of War - Electric vs Diesel

A lot of posts on this thread make it sound like you need to run a diesel at max hp for extended periods of time. It's been my experience that running a diesel wide open is extremely rare & I don't...
Forum: Engines and Propulsion Systems 18-12-2015, 06:49
Replies: 241
Views: 26,660
Posted By Scout 30
Re: Tug of War - Electric vs Diesel

Electric motors don't need transmissions. The Elco's come with everything you need except batteries. I think the EP4000 would be more than you need but that's up to you.
Forum: Engines and Propulsion Systems 17-12-2015, 15:23
Replies: 241
Views: 26,660
Posted By Scout 30
Re: Tug of War - Electric vs Diesel

I have the same motor & think the EP 2000 would be the way to go. $9,000 for the motor which is about the same price as a Beta. You'll need a charger & 6 12 volt batteries for the EP 2000. For the...
Forum: Engines and Propulsion Systems 16-12-2015, 12:58
Replies: 241
Views: 26,660
Posted By Scout 30
Re: Tug of War - Electric vs Diesel

If they wanted to skew the result they could just give the diesels less throttle. Who really cares anyway. We all know some tugs use electric motors. The real question is can electric be a viable...
Forum: Engines and Propulsion Systems 16-12-2015, 11:45
Replies: 241
Views: 26,660
Posted By Scout 30
Re: Tug of War - Electric vs Diesel

I'm not sure about that. Both boats should already be propped to achieve max rpms at WOT. However, it would be interesting to know how the 2 boats are propped.
Forum: Engines and Propulsion Systems 11-12-2015, 08:44
Replies: 241
Views: 26,660
Posted By Scout 30
Re: Tug of War - Electric vs Diesel

The Elco packages are "Plug n Play" meaning everything you need is included except batteries & a charger although you can get both of those from them also. It does not appear that they will sell...
Forum: Engines and Propulsion Systems 11-12-2015, 07:29
Replies: 241
Views: 26,660
Posted By Scout 30
Re: Tug of War - Electric vs Diesel

One of the biggest benefits of electric propulsion for me is the lack of noise. It just makes the whole experience more pleasant.
Forum: Engines and Propulsion Systems 11-12-2015, 07:20
Replies: 241
Views: 26,660
Posted By Scout 30
Re: Tug of War - Electric vs Diesel

I think that if you use a generator to create a hybrid system you would not need a generator large enough to run the motor by itself. It would only have to supplement the battery power to increase...
Forum: Engines and Propulsion Systems 11-12-2015, 05:31
Replies: 241
Views: 26,660
Posted By Scout 30
Re: Tug of War - Electric vs Diesel

I agree. For this system to be viable for a cruiser a generator is necessary. So it appears that electric is an economically viable option for day sailors & weekenders without a generator & cruisers...
Showing results 1 to 25 of 28
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