Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 19-04-2009, 08:23   #1
Registered User

Join Date: Nov 2008
Location: Seattle
Boat: Wauquiez Centurion 49
Posts: 667
Images: 13
Battery Question

I currently have 8 6v Interstate U2500HC batteries rated at 275 ah. They are set up as a 24v house system. What is my house bank capacity at 24v, 550?

I am limited on space, but would like suggestions on better/bigger replacements, i.e. Trojan, Rolls, etc.
CAELESTIS is offline   Reply With Quote
Old 19-04-2009, 08:52   #2
Moderator Emeritus
Pblais's Avatar

Join Date: Mar 2003
Location: Hayes, VA
Boat: Gozzard 36
Posts: 8,700
Images: 15
Send a message via Skype™ to Pblais
If you take the bank of 8 it is like 2 banks of 4 @ 24 volts so you then multiply the amp hours of one member of the bank of them by 2. You can combine the volts or the amp hours. So yes 550 amp hours would be the bank total rating at 24 volts.

Before you consider bigger replacements consider how you will recharge the bank. your bank size is limited by your daily charging capacity. You can charge it any way you like but you have to do it sometime regularly. A bank this size requires a fair amount of charging. Have you tried to compute how much power you really need.

If you size the bank too large you won't be recharging it fully and so it will not last as long. Over time you only can use a bank as large as you can charge. If it is too small you'll be deeply discharging it and shortening it's lifespan as well. In both cases you'll be wasting a lot of money. You really want the bank sized right. Replacement of the bank with Trojans is over $1,000 right now. All the cables crimped with heat shrink tubing and other assortment of posts and breakers to set up the bank properly also costs a lot.

Better is getting the size just right.
Paul Blais
s/v Bright Eyes Gozzard 36
37 15.7 N 76 28.9 W
Pblais is offline   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
another battery question motion30 Electrical: Batteries, Generators & Solar 3 09-03-2009 17:11
Battery Question JusDreaming Construction, Maintenance & Refit 2 28-01-2009 07:15
Battery Selection Question Wotname Electrical: Batteries, Generators & Solar 23 07-10-2008 06:13
Battery Question Ativa Electrical: Batteries, Generators & Solar 37 21-05-2007 08:30
battery drain question gonesail Electrical: Batteries, Generators & Solar 5 12-02-2007 15:30

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 16:03.

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.