Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 14-05-2016, 13:48   #1
Registered User

Join Date: Mar 2016
Boat: Lagoon 440
Posts: 33
Ultracell 250Ah Gel @13.15V at rest ??

Hi, I just purchased 4x 250 Ah UCG gel batteries made by Ultracell and to my surprise they are still at ~13.15 V after 2 days resting (not connected, still in their boxes). I was expecting about 12.8 V. Is this normal for gel batteries ??
rom is offline   Reply With Quote
Old 14-05-2016, 14:09   #2
Registered User
Zanshin's Avatar

Join Date: Feb 2007
Location: Caribbean
Boat: Jeanneau 57
Posts: 1,540
Re: Ultracell 250Ah Gel @13.15V at rest ??

The exact voltage at 100% varies by chemical composition. A quick look at Ultracell's website didn't lead me to their specific documentation (which you should request to get the correct charging voltages and amperage rates) but I did find a reference to
AGM batteries which are sealed should be brought up to 2.35 volts and then discharged to a rate of 1.75 volts per cell...
so the 13.15V seems to be a reasonable open circuit voltage (2.35*6cells = 14.1V)
-Zanshin (SV Zanshin)
Zanshin 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
Electrical Design Programs - Visio and the Rest ribbony Electrical: Batteries, Generators & Solar 11 15-10-2010 15:10
To Gel or Not to Gel - That Is the Question Fishman_Tx Construction, Maintenance & Refit 137 21-12-2009 15:49
Ruining it For The Rest of Us? ssullivan General Sailing Forum 108 16-02-2008 19:17
St. Petersburg Marina - The Rest of the Story markpj23 Off Topic Forum 0 16-02-2008 19:04
The Start of the Rest of my Life billyehh Meets & Greets 3 28-05-2007 12:24

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 00:16.

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.