Cruisers Forum

Join CruisersForum Today

  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
Thread Tools Search this Thread Rate Thread Display Modes
Old 04-10-2019, 04:05   #1
Registered User

Join Date: Jun 2013
Posts: 26
Lagoon 400 - Equalize all batteries at once or separately?

Hello CF

Here is a question that has probably been answered, but I didn't find it with the search function....

I have four 120 Amp lead acid house batteries on my Lagoon 400. They are about 14 months old, and after a recent 1 month cruise I am not convinced they are performing up to specs. I keep the cells topped off with distilled water and charge them (with generator or motors) every day. I try to have them at 100% in the evening before we go to bed, but they are down to ~50% by 0800 (the overnight load is the anchor light, cabin fans, refrigerator, and freezer)

I just purchased an Optimate6 battery charger. This charger has an automatic 9-step testing/charging process that includes an equalization phase if needed. The batteries are now fully charged (on shore power for a couple of weeks). I will check the specific gravity of each cell before/during/after using the charger, and I plan on disconnecting the battery bank from the boat before using the charger.

Here is my question:

Should I keep the batteries connected together while I use the Optimate6, or should I test/equalize/charge each battery separately? On one hand, it seems to make sense to equalize all the batteries at once (isn't that the point?). On the other hand equalizing one at a time may help me find out if one (or more...) of the batteries is dragging down the entire bank.

Thanks in advance for your help, I'm sure I'll learn alot from your posts.

Beach View is offline   Reply With Quote
Old 04-10-2019, 10:21   #2
Registered User

Join Date: Jan 2017
Posts: 12,105
Re: Lagoon 400 - Equalize all batteries at once or separately?

Each battery is a 6* 2V cells in series.

These are what need to be "equalized" aka balanced against each other.

The 6S batteries are not connected at the cell level, just at 12V.

The ideal is each unit treated separately for such maintenance routines.

This will be more precise, as they wear unevenly, a huge benefit is the testing aspect. If you do the whole bank at once you can't spot the weak link, which can cause problems for the whole bank.

Of course, doing the whole bank at once is better than delaying too long, or not doing it at all.

Many owners consider breaking the bank down an onerous job, value convenience over precision.

How you balance the two factors is of course up to you.
john61ct is offline   Reply With Quote

batteries, lagoon, lagoon 400

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
Solar directly to batteries to equalize them Sail IC Electrical: Batteries, Generators & Solar 36 13-01-2016 13:41
400: Lagoon 400 or 400 S2 Big Joe Bob Lagoon Catamarans 20 11-01-2015 13:12
venting batteries during equalize sailorboy1 Electrical: Batteries, Generators & Solar 3 19-04-2014 19:49
I'm Afraid to Equalize Palarran Electrical: Batteries, Generators & Solar 24 13-09-2010 14:48
Tender, Priced and Sold Separately from Main Boat? fishwife Dollars & Cents 8 20-10-2009 02:56

Advertise Here

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 03:46.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.