Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 17-07-2007, 14:29   #16
Registered User

Join Date: Jan 2005
Location: Seattle area (Bremerton)
Boat: C&C Landfall 39 center cockpit "Anahita"
Posts: 1,043
Images: 6
voltage based monitoring, etc.

In general, voltage based battery monitoring is "valid" under repeatable laboratory conditons (as has been mentioned in this thread already). When such monitoring is used with any variance in a charge/discharge cycle the error grows very large with large variations of current, temperature, and time.

When there is a discharge current or charge current present the voltage is relatively useless to base any conclusions regarding the state of charge of any battery.

It is difficult enough to make accurate algorithms to indicate a battery state of charge (much less state of capacity, which is the most desirable piece of information to have) using accurate hardware that can constantly monitor Amps, Volts, temperature, and time with requisite simulataneity and continuity. It is just not possible to be accurate with voltage alone.

Pulsing charging technology has been around for some time. Today, the concept is just not worthy outside of expensively shielded and contained environments not found on cruising boats if for no other reason than the EMI and RFI would not meet any international standards.

Regardless, my own tests and experiments with some so-called de-sulphating pulsing devices have never shown ANY benefit over that of using appropriately set acceptance charging voltage and/or a proper equalizing charge. Some appear to show some benefit when compared to single set-point voltage chargers or three-step chargers that do not have a sufficiently high acceptance voltage and charge time. I predict that if Betrayfor's tests include a comparison with using valid 3-step charging parameters along with a comparison with using a proper equalization method (when required) then the pulsing chargers evaluated will NOT be shown to outperform existing good quality 3-step chargers and certainly will not come close to Amp-hour law charging results.

"I don't think there'll be a return journey Mr. Frodo". Samwise Gamgee
Rick 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
Electric Main Drive(s) Limpet Multihull Sailboats 551 08-01-2012 07:37
Mixing 'types' of AGM batts?? John Drake Electrical: Batteries, Generators & Solar 18 13-12-2006 17:47

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 20:24.

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.