SailNet Community - Reply to Topic

   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 > Electrical Systems > Battery Bank – Parallel or Series
 Not a Member? 


Thread: Battery Bank – Parallel or Series Reply to Thread
Title:
  

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

Message:
Trackback:
Send Trackbacks to (Separate multiple URLs with spaces) :
Post Icons
You may choose an icon for your message from the following list:
 

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:

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.



Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below


Additional Options
Miscellaneous Options

Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below


Topic Review (Newest First)
04-19-2013 04:31 PM
wanttosail
Re: Battery Bank – Parallel or Series

Quote:
Originally Posted by NautiG View Post
Hey Maine,

I'm not saying I don't believe you, and I'll certainly wire my batteries up the way you suggest when my current batteries die, if only because it's just as easy as wiring up the "wrong" way.

I'm just an electrical layman, but I do like to see some evidence when someone makes an assertion. I'm not convinced by the evidence I've seen yet.

We argue seemingly nonstop on this forum about which is the best anchor, even when someone posts a video of their anchor "outperforming" other manufacturer's. Why should this be any different?

Scott
Gemini Catamaran Split Decision
Scott, seeing as your battery bank is wired the "wrong" way it would be interesting if you tested your batteries to see if you can spot the difference.

I am about to upgrade my battery bank, this thread has been very informative. Thanks
04-03-2013 06:08 PM
No Agenda
Re: Battery Bank – Parallel or Series

when I got my boat it was batteries were wired with the cables coming from one battery. I found that that battery would be low on water every week. I found mainsails info and wired it the other way. Now i very rarely need to add water.
03-31-2013 05:25 PM
slax
Re: Battery Bank – Parallel or Series

Quote:
Originally Posted by mitiempo View Post
Mixing battery ages isn't perfect but one bank is always more efficient than separate smaller banks.
since there is realistically no single space I can stow these 6 units in direct proximity to eachother, I was contemplating putting them in groups of 2 in parallel creating 3 12v units and following either #3 or #4 on this page. Seems logical if I then use matching length properly gauged connects back to both a positive and negative bus, or daisychain them in a 3 battery config from there as in #4, makes proportional sense to the eyes as my starter bank and isolator switch, is right in the middle of the 3 spaces I could use, off to do some measuring...
03-31-2013 03:28 PM
btrayfors
Re: Battery Bank – Parallel or Series

First thing I'd do would be to:

1. Charge them up fully...at least overnite on a charger;

2. Put them in one series/parallel bank and give them an equalizing charge -- 15.5-16.5 VDC for 4-6 hours (watch them carefully for loss of electrolyte and overheating);

3. Test the capacity of each battery individually, using a good resistance tester like the Midtronics series (beg, borrow or steal one for the 1/2 hour it would take to check all 6);

4. Throw out any bad ones, i.e., those testing less than 550-600 MCA; and

5. See what you've got left. Sometimes, free used batteries aren't such a bargain :-)

Bill
03-31-2013 04:26 AM
mitiempo
Re: Battery Bank – Parallel or Series

Mixing battery ages isn't perfect but one bank is always more efficient than separate smaller banks.
03-31-2013 12:39 AM
slax
Re: Battery Bank – Parallel or Series

Howdy,
Been great following this thread, has helped me make some decisions as well as aquiring a broader general knowledge and tips. Though I have a series parallel question, I recently aquired a set of used 6 6v t105's and was planning on running them in a single bank at 12v-675Ah, how should one distribute the varying grades of life/quality? Or does it matter as the system is effected by the lowest common denominator? I still need to fully test them all but was trying to do some research beforehand. Would something like breaking it into 2 banks or even 3 if there that far off eachother in a match work out to be more beneficial then using all of them in a single bank?


H
03-29-2013 07:55 PM
Maine Sail
Re: Battery Bank – Parallel or Series

Quote:
Originally Posted by NautiG View Post
Main,

I'm cool with amps, watts, volts, resistance, amp/hours and a few other high school physics/basic electronics terminology. What is cca?

Scott
Gemini Catamaran Split Decision
The Midtronics analyzers display performance as CCA, MCA etc.. They are cold cranking amps (0F), MCA (32F). My other analyzer does the same but it can also show the batteries internal resistance.

It is a very complex algorithm and test procedure all done based on internal resistance. It can be fairly closely translated to useful life left in the battery. A battery that tests at 80% or less of "new" CCA rating is technically "dead" by industry standards.

Because many batteries ship at higher than their rating, a baseline needs to be done so all future tests are accurate based on "new". Some batteries ship at exactly their rating and others are as much as 100-300 CCA more than the rating.


Because many deep cycle batteries don't display a CCA or MCA rating I have tested many of them when new and keep a file.

Also when I buy batteries I buy them as closely matched as I can..

I also use them to track before and after performance of an equalization or two...



I even used them to do long term testing on "battery desulphators"... Should probably be called de-snake oil"......

"What do you mean my battery is dead? It's only a year old."
03-29-2013 07:33 PM
NautiG
Re: Battery Bank – Parallel or Series

Main,

I'm cool with amps, watts, volts, resistance, amp/hours and a few other high school physics/basic electronics terminology. What is cca?

Scott
Gemini Catamaran Split Decision
03-29-2013 07:16 PM
Maine Sail
Re: Battery Bank – Parallel or Series

Quote:
Originally Posted by NautiG View Post
Hey Maine,

I'm not saying I don't believe you, and I'll certainly wire my batteries up the way you suggest when my current batteries die, if only because it's just as easy as wiring up the "wrong" way.

I'm just an electrical layman, but I do like to see some evidence when someone makes an assertion. I'm not convinced by the evidence I've seen yet.

We argue seemingly nonstop on this forum about which is the best anchor, even when someone posts a video of their anchor "outperforming" other manufacturer's. Why should this be any different?

Scott
Gemini Catamaran Split Decision

I am going to be uploading two videos I just made.

Bank One: Customers bank of 3 Duracell/Deka group 24 batteries. Bank approx 2 years old and was end connected. Batteries are way out of whack. Rated at 550CCA

Battery #1 = 490CCA (the end connected battery)
Battery #2 = 553CCA (the second battery)
Battery #3 = 649CCA (the last battery in the string)

159 CCA difference between battery 3 and battery one at just two years old.

Bank Two: My own bank of Wal*Mart MAAX-29/group 31 batteries. Entire bank cost me $210.00.... Bank is 7 years old and was always wired in a cross connected manner. Batteries are very well balanced for 7 years old. Rated at 675CCA.

Battery #1 = 818CCA (system positive connection)
Battery #2 = 845CCA (middle battery in string)
Battery #3 = 820CCA (system negative connection)

27 CCA difference between best battery and worst at SEVEN years old......

The videos take a while to upload.....
03-29-2013 06:33 PM
NautiG
Re: Battery Bank – Parallel or Series

Hey Maine,

I'm not saying I don't believe you, and I'll certainly wire my batteries up the way you suggest when my current batteries die, if only because it's just as easy as wiring up the "wrong" way.

I'm just an electrical layman, but I do like to see some evidence when someone makes an assertion. I'm not convinced by the evidence I've seen yet.

We argue seemingly nonstop on this forum about which is the best anchor, even when someone posts a video of their anchor "outperforming" other manufacturer's. Why should this be any different?

Scott
Gemini Catamaran Split Decision
This thread has more than 10 replies. Click here to review the whole thread.

 
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


All times are GMT -4. The time now is 12:19 PM.

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.