Running diesel to Charge Batteries - SailNet Community
Reply
 
LinkBack Thread Tools
post #1 of 30 Old 09-25-2009 Thread Starter
SaltwaterSuzi/CapnLarry
 
LarryandSusanMacDonald's Avatar
 
Join Date: Apr 2005
Location: Permanent Vacation
Posts: 604
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 11
 
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.



LarryandSusanMacDonald is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 30 Old 09-25-2009
me at 67!
 
deniseO30's Avatar
 
Join Date: Nov 2006
Location: Bristol pa
Posts: 6,925
Thanks: 55
Thanked 125 Times in 114 Posts
Rep Power: 10
   
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.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


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

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


My boat is sold!
deniseO30 is offline  
Quote Quick Reply Share with Facebook
post #3 of 30 Old 09-25-2009
Member
 
priscilla's Avatar
 
Join Date: Mar 2000
Location: Marblehead, Ma.
Posts: 85
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 16
 
The engine is just happy to be running....it likes a little load and your alternator provides that.

Priscilla
priscilla is offline  
Quote Quick Reply Share with Facebook
post #4 of 30 Old 09-25-2009
Senior Member
 
GeorgeB's Avatar
 
Join Date: Dec 2004
Location: Alameda, San Francisco Bay
Posts: 1,819
Thanks: 1
Thanked 52 Times in 51 Posts
Rep Power: 11
 
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?
GeorgeB is offline  
Quote Quick Reply Share with Facebook
post #5 of 30 Old 09-25-2009
Moderator
 
JohnRPollard's Avatar
 
Join Date: Mar 2007
Location: Chesapeake
Posts: 5,680
Thanks: 0
Thanked 3 Times in 3 Posts
Rep Power: 10
     
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
JohnRPollard is offline  
Quote Quick Reply Share with Facebook
post #6 of 30 Old 09-25-2009
Senior Member
 
BarryL's Avatar
 
Join Date: Aug 2003
Location: Long Island, NY
Posts: 1,806
Thanks: 4
Thanked 46 Times in 41 Posts
Rep Power: 12
 
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
Deep Blue C, 2002 C&C 110
Mt. Sinai, NY

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
BarryL is offline  
Quote Quick Reply Share with Facebook
post #7 of 30 Old 09-25-2009 Thread Starter
SaltwaterSuzi/CapnLarry
 
LarryandSusanMacDonald's Avatar
 
Join Date: Apr 2005
Location: Permanent Vacation
Posts: 604
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 11
 
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.



LarryandSusanMacDonald is offline  
Quote Quick Reply Share with Facebook
post #8 of 30 Old 09-25-2009
Senior Member
 
Join Date: May 2007
Posts: 551
Thanks: 3
Thanked 3 Times in 3 Posts
Rep Power: 9
 
Here's a short article on the subject...

Bore glazing
SteveInMD is offline  
Quote Quick Reply Share with Facebook
post #9 of 30 Old 09-25-2009
Moderator
 
JohnRPollard's Avatar
 
Join Date: Mar 2007
Location: Chesapeake
Posts: 5,680
Thanks: 0
Thanked 3 Times in 3 Posts
Rep Power: 10
     
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
JohnRPollard is offline  
Quote Quick Reply Share with Facebook
post #10 of 30 Old 09-25-2009
Senior Member
 
Join Date: Apr 2008
Posts: 476
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
 
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.
negrini is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



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

Posting Rules  
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome