Reply
 
Thread Tools Display Modes
 
Old 03-08-2015, 08:28 AM   #61
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 16,515
"How much money does it save if you don't need a generator?"

LOADS!

Innormal cruising you will power the reefer ( usually 100+AH /day) with ????

Air cond is out , and cabin heat may be just run O note.

Of course a propane reefer and an oil range will solve both problems , but then the batt can be tiny as it only powers toys or LED lights.
__________________
Advertisement

FF is offline   Reply With Quote
Old 03-08-2015, 05:20 PM   #62
QB
Senior Member
 
QB's Avatar
 
City: San Diego and Gabriola
Country: USA and Canada
Vessel Name: Skookum Maru
Vessel Model: Ed Monk design #1924
Join Date: Dec 2011
Posts: 215
Quote:
Originally Posted by dannc View Post
Because LiFePo batteries can take a huge amount of power quickly, I wonder if one can size the battery bank with one or two alternators that would properly load the main engine at anchor.
How much charging current capacity do you want? 800A, say? That would be a lot. (I suppose you could put together an 800A 12V system using belt-driven alternators but it wouldn't be cheap.) It would give you a 4C rate for a 200Ah LiFePO4 bank, or 2C for a 400aH bank, which they are supposed to be able to absorb. But that is only about 10 kilowatts, or around 13 horsepower... not really a load on a typical trawler propulsion engine.

The theoretical advantage of high charging rates for LiFePO4 cells is hard to realize in a marine application, IMO.
__________________

QB is online now   Reply With Quote
Old 03-09-2015, 08:09 AM   #63
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 16,515
"The theoretical advantage of high charging rates for LiFePO4 cells is hard to realize in a marine application, IMO."

The lowest cost would be a rebuilt bus alt , 300A / 24V , dual B belts or flat belt drive.

After that its a$rtonomical!!
__________________

FF 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 12:20 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