Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 04-04-2016, 20:34   #16
Gnarly Senior Cruiser
Toys_with_time's Avatar

Cruisers Forum Supporter

Join Date: May 2008
Location: Summer 1 sailing in the Aegean, summer 2 in Australia.
Boat: FP Lipari 41, Katmazu
Posts: 197
Re: Is high current draw bad for deep cycle batteries?

Originally Posted by tinkrman69 View Post
With multiple batteries run in parallel, the draw is not always equal on all batteries in the circuit. Its funny you mention plumbing, as it's very similar in many respects.

In a plumbing situation, say, you have two equal tanks sitting on a level plane. you plumb a 1/2 drain pipe from both tanks to a 1 inch pipe at the same point, one foot below the level of the tanks. one tank is two feet away and the other tank os 100 feet away. Due to the friction/resistance in the pipes the nearer tank will empty first.

in a battery bank run in parallel whilst a draw is present the last battery will contribute the least and like wise receive charge last. electricity flows the path of lest resistance or the shortest path. in essence, the successive batteries from the back foreword would drain into the previous battery. If all the batteries in a parallel circuit were wired to a single point respective of + and- with all cables the same length and size and the load taken from that point, then you would have an equal draw and recharge of the batteries in that bank

unlike plumbing, if you increased the wire size of the jumper from the back battery the resistance in the wire would increase too. A physicist might be able to figure a balance, but electrolysis in the wire would change the balance in time. Its easier and longer lasting to wire it to a central point. Say #4 jumpers coming into a #2 wire or #2 jumper wires into a 00 wire and so forth.
Understood, thank you. Does this mean that ideally I should rotate my batteries, say annually, so the one furthest from the buss bar is swapped with the one nearest the buss bar etc thus helping to equalise the work they all do over their life?


Live in the sunshine, swim the sea, drink the wild air........
Ralph Waldo Emerson, 1803-1882
Toys_with_time is online now   Reply With Quote


Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Deep-Cycle Flooded/wet lead-acid batteries used as STARTER batteries? (Trojan T-105) ErikFinn Electrical: Batteries, Generators & Solar 9 22-08-2014 17:33
Fridge high current draw Thegoodshipmagn Plumbing Systems and Fixtures 31 10-05-2013 17:02
Deep Cycle batteries Jacana Electrical: Batteries, Generators & Solar 0 01-12-2008 03:17
Ading Batteries/Starting from Deep Cycle witzgall Electrical: Batteries, Generators & Solar 4 19-08-2008 10:02
Toyota on Lithium Deep Cycle Batteries hellosailor Electrical: Batteries, Generators & Solar 4 28-10-2006 14:00

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 13:49.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.