how many engine batteries? AGM's not upright? - 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 > On Board > Gear & Maintenance
 Not a Member? 
  #1  
Old 12-02-2008
Bristol 45.5 - AiniA
 
Join Date: May 2006
Posts: 3,129
Thanks: 3
Thanked 61 Times in 54 Posts
Rep Power: 9
killarney_sailor is on a distinguished road
how many engine batteries? AGM's not upright?

I have a fairly complicated battery system and I am wondering if I can simplify it at the same time that I expand the house battery capacity. I have two questions:
1. There are 2 house banks along with separate starting batteries for the engine and genset. Can I use the same battery to start both engines? I would really like to use the space where one of the starting batteries is to place a house bank battery.

2. Also, the manufacturer's info for AGMs says they can be placed in any orientation other than upside down. It would help spacewise if I could place one of these on end - well braced of course. Does anyone have experience with doing this?

Thanks for any suggestions.
Thanks
Reply With Quote Share with Facebook
  #2  
Old 12-02-2008
chucklesR's Avatar
Senior Member
 
Join Date: Sep 2007
Location: Pasadena Md - Magothy side
Posts: 5,977
Thanks: 10
Thanked 30 Times in 30 Posts
Rep Power: 9
chucklesR is a jewel in the rough chucklesR is a jewel in the rough chucklesR is a jewel in the rough
AGM's can indeed be placed in almost any orientation.

I'd go with one house bank rather than two, one large bank is better for the batteries - and since bulk charging is a matter of percentages - it will charge faster and last longer. There is a lot of discussion on that here and elsewhere.

As to starters, have one dedicated starter battery and install a switch and combiner so that if needed you can use either and or both starter/house to start the engine/genset. Make sure you put a good monitor on it (Xantrex XBM or Link 1000/2000 ) so you can keep up with the condition of your batteries and you'll be all set.
Reply With Quote Share with Facebook
  #3  
Old 12-02-2008
sailingdog's Avatar
Telstar 28
 
Join Date: Mar 2006
Location: New England
Posts: 43,291
Thanks: 0
Thanked 9 Times in 9 Posts
Rep Power: 13
sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice
Killarney-

I'd second combining the two house banks into a single one. The lower the average draw compared to battery bank size, the longer the bank can power it for. This is due to the Peukert factor. Two 100 amp-hour banks would give you less usable power than a single 200 amp-hour battery bank—given the exact same load.
__________________
Sailingdog

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

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
Reply With Quote Share with Facebook
  #4  
Old 12-03-2008
Valiente's Avatar
Senior Member
 
Join Date: Jun 2006
Location: Toronto
Posts: 5,491
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 10
Valiente has a spectacular aura about Valiente has a spectacular aura about
I agree, Bruce. My plans are for simple (and big) battery banks and more complicated switching. The idea is that multiple charge sources (alt, solar, wind, genset if needed) feed into the house banks of 4 x 8D batteries, circa 840 Ah in my "vision". This in turn feeds to 12 VDC "house" circuits, a 2000W inverter/charger, and an echo charger that feeds the start battery. A secondary charge circuit can be selected to charge a second deep cycle forward for anchor winch power, but this is not directly connected to the main bank with heavy cable.

Circuit monitoring and isolators determine when the house batteries "feed" the echo charger, and when alternator power can bypass the house bank and directly charge either the start and windlass circuits, or both.

If we are motorsailing on a sunny, breezy day say to get out to the three-mile limit to pump the holding tank, I might very well have topped-off house batteries in this scenario. Routing alternator output to the start battery is faster and more efficient and takes nothing from the house bank.

Finally, I would consider a circuit from the house bank to "jump" the diesel under emergency situations. All this makes for a fair bit of monitoring and management, but it keeps the cabling and runs short and accessible...and keeps the big "house" bank above the 80% spot that is ideal.
Reply With Quote Share with Facebook
  #5  
Old 12-03-2008
Cruisingdad's Avatar
Best Looking MALE Mod
 
Join Date: Jul 2006
Location: Washington State
Posts: 9,904
Thanks: 3
Thanked 107 Times in 53 Posts
Rep Power: 10
Cruisingdad is a jewel in the rough Cruisingdad is a jewel in the rough Cruisingdad is a jewel in the rough
You have received good information above.

- CD
__________________
Sailnet Moderator



1987 Tayana Vancouver 42, Credendo Vides, (Mom and Pops boat, F/T Mobile Live Aboards in Puget Sound)

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


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


Follow me on Facebook:

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
  #6  
Old 12-03-2008
Bristol 45.5 - AiniA
 
Join Date: May 2006
Posts: 3,129
Thanks: 3
Thanked 61 Times in 54 Posts
Rep Power: 9
killarney_sailor is on a distinguished road
Thanks for the useful suggestions

They pretty much support the inclinations that I have had about the battery system. The existing system is more complex than it needs to be I think. Now to actually get on with it (and to start figuring out the solar/wind power.
Reply With Quote Share with Facebook
  #7  
Old 12-03-2008
Valiente's Avatar
Senior Member
 
Join Date: Jun 2006
Location: Toronto
Posts: 5,491
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 10
Valiente has a spectacular aura about Valiente has a spectacular aura about
Bruce, my blog has a jpeg of my electrical system ideas that might help you to visualize this better. It really is a step-by-step thing (starting with "what are my daily needs, times three, divided by an 80% state of charge?") that goes from there to all the other things that create the juice.

In my case, I have the added element of galvanic isolation!
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
Surveying a Diesel Engine Tom Wood Buying a Boat Articles 0 01-26-2003 07:00 PM
Replacing the Diesel Engine Sue & Larry Gear and Maintenance Articles 0 06-12-2000 08:00 PM


All times are GMT -4. The time now is 06:07 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

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.