Running diesel to Charge Batteries - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > General Interest Forums > Gear & Maintenance
 Not a Member? 
  #1  
Old 09-25-2009
LarryandSusanMacDonald's Avatar
SaltwaterSuzi/CapnLarry
 
Join Date: Apr 2005
Location: Permanent Vacation
Posts: 600
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 10
LarryandSusanMacDonald will become famous soon enough
Running diesel to Charge Batteries

This has probably been talked about, but I'm too lazy to look it up.

Today, we started the diesel engine again to charge up the batteries. Saltwater Suzi (an order of magnitude smarter than I) softly asked, "I thought we bought the Honda Generator to do that."

I answered, "It's a hassle and makes too much noise."

She countered, "I thought you told me that it wasn't good for the diesel to run it just to charge the batteries."

I pondered a response that wasn't going to get me into a lot of hot water, and failing same said, "I've heard that, too. But I can't imagine why."

And I can't. So I ask, is it so and if so why? Not too technical please, I can't afford to risk spraining my brain again. (Had a thought the other day and it laid me up for hours.)

As usual, thanks in advance for your input.
__________________
Saltwater Suzi and Cap'n Larry


"A sailboat is a fickle mistress. You’ve got to buy her things. You’ve got to understand everything about her. What you don’t know she’ll use against you." -Captain Larry


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



Reply With Quote Share with Facebook
  #2  
Old 09-25-2009
deniseO30's Avatar
Lies about her age
 
Join Date: Nov 2006
Location: Bristol pa
Posts: 5,450
Thanks: 50
Thanked 53 Times in 45 Posts
Rep Power: 9
deniseO30 will become famous soon enough deniseO30 will become famous soon enough
Now if you had even 10watts of solar the batteries would stay topped off. so there's a 3rd option . giggles
__________________
Denise, Bristol PA, Oday 30. On Tidal Delaware River, Anchor Yacht Club. New Website!
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

my current "project"!
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #3  
Old 09-25-2009
priscilla's Avatar
Member
 
Join Date: Mar 2000
Location: Marblehead, Ma.
Posts: 83
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 15
priscilla is on a distinguished road
The engine is just happy to be running....it likes a little load and your alternator provides that.
__________________
Priscilla
Reply With Quote Share with Facebook
  #4  
Old 09-25-2009
GeorgeB's Avatar
Senior Member
 
Join Date: Dec 2004
Location: Alameda, San Francisco Bay
Posts: 1,277
Thanks: 1
Thanked 23 Times in 22 Posts
Rep Power: 10
GeorgeB is on a distinguished road
You have a Morgan 41? What size is your engine and how big is your alternator? I imagine that your engine is somewhere around 50 horse? A 120 amp alternator is barely going to put a load on the engine. Over time, you run the risk of the exhaust elbow “coking up” with un burnt hydrocarbons because there isn’t sufficient pressure to blow them out. They build up over time, restricting the exhaust flow, resulting in higher pressures and temperatures. Ultimately causing elbow cracking or burn-through. Diesels are happiest running WOT. Is your alternator an externally regulated one?
Reply With Quote Share with Facebook
  #5  
Old 09-25-2009
JohnRPollard's Avatar
Moderator
 
Join Date: Mar 2007
Location: Chesapeake
Posts: 5,680
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 10
JohnRPollard is a jewel in the rough JohnRPollard is a jewel in the rough JohnRPollard is a jewel in the rough
Quote:
Originally Posted by LarryandSusanMacDonald View Post
"I thought we bought the Honda Generator to do that."
For that kind of money, you could have avoided all the noise and hassle and bought a few linear miles of extension cord.
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Pacific Seacraft Crealock 31 #62

NEVER CALLS CRUISINGDAD BACK....CAN"T TAKE THE ACCENT
Reply With Quote Share with Facebook
  #6  
Old 09-25-2009
BarryL's Avatar
Senior Member
 
Join Date: Aug 2003
Location: Long Island, NY
Posts: 1,538
Thanks: 3
Thanked 17 Times in 16 Posts
Rep Power: 11
BarryL is on a distinguished road
Hello,

Engines, especially older engines, do not like to idle. The engine does not get hot enough to burn off impurities in the oil. The fuel injection is not designed to be very accurate at idle, so the fuel burn is not complete and the exhaust will be sooty. This leads to build up in the exhaust system.

In short, diesels like to be run at cruising RPM and not idle speed. IMHO, if you need to run the engine to charge batts, put the boat in gear. That will put more load on the engine.

Barry
__________________
Barry Lenoble
Day To Remember, 1986 O'day 35 For Sale
Deep Blue C, 2002 C&C 110 For Sail
Mt. Sinai, NY

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #7  
Old 09-25-2009
LarryandSusanMacDonald's Avatar
SaltwaterSuzi/CapnLarry
 
Join Date: Apr 2005
Location: Permanent Vacation
Posts: 600
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 10
LarryandSusanMacDonald will become famous soon enough
Denise:

I guess I didn't mention that we are live-aboard cruisers. 10 watts is akin to spitting in the ocean. We've got computer, microwave, coffeemaker, TV, etc. all the comforts of home.

Priscilla,
> >
I like your answer best (for my purposes, at least, it keeps me out of trouble with Suzi)

GeorgeB.

Westerbeke 55B (about 4 years old 853 hours) with 170amp alternator, set to 100 amp output max with Link 2000r. We run at about 1400 rpm when charging batts - it runs about the same temp (~180) when we are moving the boat as when just charging batteries.


John,



Got it used - 2000 watt for only $500. I am the Frugal Mariner, you know!



So am I O.K. here? Can I run the diesel or should I go with Mr. Noisy?
__________________
Saltwater Suzi and Cap'n Larry


"A sailboat is a fickle mistress. You’ve got to buy her things. You’ve got to understand everything about her. What you don’t know she’ll use against you." -Captain Larry


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



Reply With Quote Share with Facebook
  #8  
Old 09-25-2009
Senior Member
 
Join Date: May 2007
Posts: 517
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 7
SteveInMD is on a distinguished road
Here's a short article on the subject...

Bore glazing
Reply With Quote Share with Facebook
  #9  
Old 09-25-2009
JohnRPollard's Avatar
Moderator
 
Join Date: Mar 2007
Location: Chesapeake
Posts: 5,680
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 10
JohnRPollard is a jewel in the rough JohnRPollard is a jewel in the rough JohnRPollard is a jewel in the rough
Quote:
Originally Posted by LarryandSusanMacDonald View Post


John,

Got it used - 2000 watt for only $500. I am the Frugal Mariner, you know!
Yeah, but the extension cords are so much quieter. And they can double as spare standing rigging in a pinch.

__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Pacific Seacraft Crealock 31 #62

NEVER CALLS CRUISINGDAD BACK....CAN"T TAKE THE ACCENT
Reply With Quote Share with Facebook
  #10  
Old 09-25-2009
Senior Member
 
Join Date: Apr 2008
Posts: 475
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
negrini is on a distinguished road
Send a message via AIM to negrini Send a message via Yahoo to negrini Send a message via Skype™ to negrini
Barry, me too were educated on this, including specialists observating same advice. Steve, I had red this article before, wich corroborate to people like Nigel Calder. What I couldn't explain is in a heavy traffic city like here, people spend (an average) 3 hours per day in traffic, mostly iddling the engines, but diesel cars/van/truck are still very reputable for longevity and reliability. I can understand the efficiency math (running a big beast to power tinny 500W to your DC system), where oversized generators are wasting more fuel per Watt, if compared to smaller unities) but cannot understand why marine diesels wear faster if iddling, copared to automtive diesels iddling. Should marine learn a thing or two from automotive industry ?
__________________
Nave Rara
Beneteau Oceanis 43
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Paralleling Batteries dave.verry Gear & Maintenance 79 11-27-2006 11:19 AM
house batteries seac Gear & Maintenance 9 08-23-2004 04:28 AM


All times are GMT -4. The time now is 02:26 AM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012