Reply
 
Thread Tools Display Modes
 
Old 11-10-2014, 02:03 PM   #121
Guru
 
City: gulf coast
Country: pinellas
Join Date: Jun 2014
Posts: 2,199
Quote:
Do the math. 48V, 106A, 3 phase AC can make ~12bhp.


Three phase batteries is it now?
__________________
Advertisement

bayview is offline   Reply With Quote
Old 11-10-2014, 02:06 PM   #122
Guru
 
City: gulf coast
Country: pinellas
Join Date: Jun 2014
Posts: 2,199
Anyone taking on the restoration of a classic woody deserves applause for the boat.
Your power choices are at best unclear.
__________________

bayview is offline   Reply With Quote
Old 11-10-2014, 02:49 PM   #123
Guru
 
City: North Charleston, SC
Country: USA
Join Date: Sep 2010
Posts: 4,390
Quote:
Originally Posted by Skinny View Post
.................... Being different is cool!
It's easier and a lot cheaper to do that with a weird haircut or wearing your pants backwards.
rwidman is offline   Reply With Quote
Old 11-10-2014, 02:50 PM   #124
Guru
 
ranger42c's Avatar
 
City: Maryland
Country: USA
Vessel Model: 42' Sportfish
Join Date: Aug 2013
Posts: 3,159
Quote:
Originally Posted by rwidman View Post
Recharging the batteries pretty much defeats the purpose of an electric powered boat, doesn't it?

Don't see how. Joan's intended use as she described it sounds to me to be very well matched to a battery solution.

-Chris
__________________
South River, Chesapeake Bay
ranger42c is offline   Reply With Quote
Old 11-10-2014, 03:04 PM   #125
Guru
 
Northern Spy's Avatar
 
City: Powell River, BC
Country: Canada
Vessel Name: Northern Spy
Vessel Model: Nordic Tug 26
Join Date: Feb 2012
Posts: 2,668
Quote:
Originally Posted by bayview View Post

Three phase batteries is it now?
No. I am saying (guessing) it is a three phase inverter powering an AC induction motor thru a VFD.

Such magic does exist and is quite common outside if the recreational boating world...
Northern Spy is online now   Reply With Quote
Old 11-10-2014, 03:17 PM   #126
Guru
 
City: North Charleston, SC
Country: USA
Join Date: Sep 2010
Posts: 4,390
Quote:
Originally Posted by ranger42c View Post
Don't see how. Joan's intended use as she described it sounds to me to be very well matched to a battery solution.

-Chris
I meant to say "Recharging the batteries with a generator pretty much defeats the purpose of an electric powered boat, doesn't it?"

Sorry for the confusion.
rwidman is offline   Reply With Quote
Old 11-10-2014, 03:33 PM   #127
Guru
 
City: Satsuma FL
Country: United States
Vessel Name: No Mo Trawla
Vessel Model: Hurricane SS188
Join Date: Jul 2014
Posts: 1,681
Quote:
Originally Posted by rwidman View Post
I meant to say "Recharging the batteries with a generator pretty much defeats the purpose of an electric powered boat, doesn't it?"
I thought the purpose was to silently sneak up on water fowl!
Donsan is offline   Reply With Quote
Old 11-10-2014, 03:55 PM   #128
Guru
 
City: North Charleston, SC
Country: USA
Join Date: Sep 2010
Posts: 4,390
Quote:
Originally Posted by Donsan View Post
I thought the purpose was to silently sneak up on water fowl!
This would probably work better:

rwidman is offline   Reply With Quote
Old 11-10-2014, 03:58 PM   #129
Guru
 
Ski in NC's Avatar
 
City: Wilmington, NC
Country: USA
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 3,888
It can be practical to run batts/elec propulsion with a gennie to charge. If 90% of trips are within batt range, then 90% involve NO running of the gen. That works fine. Gennie helps out on the remaining 10% of trips.

The key parameter is what are the durations of expected trips? If running all day in the ditch or bay or offshore, no good.
Ski in NC is offline   Reply With Quote
Old 11-10-2014, 04:12 PM   #130
Guru
 
City: North Charleston, SC
Country: USA
Join Date: Sep 2010
Posts: 4,390
Quote:
Originally Posted by Ski in NC View Post
It can be practical to run batts/elec propulsion with a gennie to charge. If 90% of trips are within batt range, then 90% involve NO running of the gen. That works fine. Gennie helps out on the remaining 10% of trips.

The key parameter is what are the durations of expected trips? If running all day in the ditch or bay or offshore, no good.
I think it's been established that a typical portable or "Honda" generator cannot provide the power to keep the boat moving. It will take several hours to recharge the batteries.

If you install a genset powerful enough to provide the power needed by the motor you've now designed a "hybrid" or diesel electric boat.

The April 2014 issue of PassageMaker magazine goes into this and the variations in great detail.

If this was what the OP was leaning towards, the original diesel engine could have been retained and connected to a generator and batteries to drive the motor.

The bottom line is, it takes "X" amount of energy to move a particular boat through the water at a given speed (over water) no mater where that energy comes from.
rwidman is offline   Reply With Quote
Old 11-10-2014, 04:35 PM   #131
Guru
 
City: gulf coast
Country: pinellas
Join Date: Jun 2014
Posts: 2,199
If this were an electrical hobbyist it would be fun. Otherwise a small diesel would be so much simpler and im sure satisfying to own.
bayview is offline   Reply With Quote
Old 11-10-2014, 05:40 PM   #132
Senior Member
 
Starside's Avatar
 
City: Washington, DC
Country: USA
Vessel Name: Starside
Vessel Model: 1930 Elco Marinette
Join Date: Oct 2014
Posts: 172
This thread is like the Energizer Bunny! It goes on and on...

(Someone said earlier to see the humor! So there it is...)

:-)
Starside is offline   Reply With Quote
Old 11-10-2014, 06:47 PM   #133
Guru
 
City: Hotel, CA
Country: Fried
Join Date: Sep 2011
Posts: 8,328
Quote:
Originally Posted by Starside View Post
This thread is like the Energizer Bunny! It goes on and on...

(Someone said earlier to see the humor! So there it is...)

:-)
Oh yeah, you'll fit in fine around here.

We have a great setting at this forum called the "ignore user" feature. Figure if you ever get tired of the same people calling you stupid over and over again just click on their screen name and select the ignore user button from the drop down menu and you'll never have to see or hear from them again.

Nice Elco, there's a similar one 3 slips down from me. ~Craig
__________________
Craig

It's easier to fool people than to convince them that they've been fooled - Mark Twain
CPseudonym is offline   Reply With Quote
Old 11-11-2014, 06:18 AM   #134
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 16,530
>I meant to say "Recharging the batteries with a generator pretty much defeats the purpose of an electric powered boat, doesn't it?"<

There is realistically NO practical use for an electric powered recreational boat , just too limited in speed amnd range.

But BRAGGING RIGHTS , as you strut the dock might be worth an extra $25-$75K.
FF is offline   Reply With Quote
Old 11-13-2014, 06:26 PM   #135
Senior Member
 
mahal's Avatar
 
Join Date: May 2010
Posts: 436
Starside,

I came across this article today and thought of your project.
The Log Newspaper | California Boating & Fishing News - NHYC-refits-its-shore-boat-with-electric-motor

My brother owns a 22' Duffy that I get to use - I prefer it over my GB36 and my 12' Novurania center console for local cruising. No noise or vibration.
mahal is offline   Reply With Quote
Old 11-13-2014, 07:17 PM   #136
Guru
 
City: North Charleston, SC
Country: USA
Join Date: Sep 2010
Posts: 4,390
Quote:
Originally Posted by mahal View Post
Starside,

I came across this article today and thought of your project.
The Log Newspaper | California Boating & Fishing News - NHYC-refits-its-shore-boat-with-electric-motor
From the article:

Quote:
ďThe beauty of the engine is itís burning no fuel, itís no longer diesel and completely electric and probably saves us $5,000 a year in fuel,Ē .......
It's pretty sorry that an adult would say something so stupid. Where is this electricity coming from? Falling out of the sky?

Somebody, somewhere is burning something to generate electricity and while they may save $5K in fuel, they will see at least that increase in their electric bill.
rwidman is offline   Reply With Quote
Old 11-13-2014, 07:47 PM   #137
Senior Member
 
mahal's Avatar
 
Join Date: May 2010
Posts: 436
Quote:
Originally Posted by rwidman View Post
while they may save $5K in fuel, they will see at least that increase in their electric bill.
Hardly. On a Duffy, it cost around $1 in electricity to cruise all day. By the way, Marshall Duffield the yacht club member mentioned in the article is the founder and owner of the highly successful Duffy Electric Boats. So no stupid adults in this project.
mahal is offline   Reply With Quote
Old 11-13-2014, 07:55 PM   #138
Guru
 
City: North Charleston, SC
Country: USA
Join Date: Sep 2010
Posts: 4,390
Quote:
Originally Posted by mahal View Post
Hardly. On a Duffy, it cost around $1 in electricity to cruise all day. .......
No doubt but you can only cruise two hours.
rwidman is offline   Reply With Quote
Old 11-13-2014, 08:06 PM   #139
Senior Member
 
mahal's Avatar
 
Join Date: May 2010
Posts: 436
Quote:
Originally Posted by rwidman View Post
No doubt but you can only cruise two hours.
Wrong again. I get seven hours per charge. Even a Duffy without the extended battery pack option still cruises for four hours. But who owns one with just the standard battery pack when there is room to double the capacity.

It seems that you know very little about electric boats, yet seem very critical of them. Have you driven one? It might just change your opinion.
mahal is offline   Reply With Quote
Old 11-13-2014, 09:08 PM   #140
Senior Member
 
BryanF's Avatar


 
City: Astoria
Country: USA
Vessel Name: Florence A
Vessel Model: 47' Sutton
Join Date: Oct 2014
Posts: 173
These people seem to have the electric diesel hybrid boat thing worked out. Good range too.
General Dynamics Electric Boat
__________________

BryanF is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





All times are GMT -5. The time now is 10:38 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012