Reply
 
Thread Tools Search this Thread Display Modes
 
Old 10-14-2021, 07:22 AM   #1
Veteran Member
 
City: Baltimore, Maryland
Vessel Name: HAVEN
Vessel Model: Golden Star 35
Join Date: Jul 2013
Posts: 88
Connecting Multiple 12v Batteries to a Charger

My 3 lead acid 4d batts are dying so I purchased 3 lithium phosphate batts & the appropriate charger. I plan to use the existing wiring config that exists off the old 40 amp Xantrex. My question is, will the new batts, connected in parallel, charge evenly from the new Xantrex charger/inverter?
artfulltune is offline   Reply With Quote
Old 10-14-2021, 07:40 AM   #2
Valued Technical Contributor
 
DavidM's Avatar
 
City: Litchfield, Ct
Join Date: Aug 2012
Posts: 6,096
Most 12V lithium batteries, Battle Born for one, work fine connected in parallel for charging. You should check your wire size though on both the charging circuit and supply circuits. Lithium batteries can take more charging current and supply more current to users long term.

David
DavidM is offline   Reply With Quote
Old 10-14-2021, 08:58 AM   #3
Guru
 
Codger2's Avatar
 
City: San Diego
Vessel Name: Circuit Breaker
Vessel Model: 2021..22' Duffy Cuddy cabin
Join Date: Oct 2007
Posts: 6,666
Quote:
Originally Posted by DavidM View Post
Most 12V lithium batteries, Battle Born for one, work fine connected in parallel for charging. You should check your wire size though on both the charging circuit and supply circuits. Lithium batteries can take more charging current and supply more current to users long term.

David
__________________
Done with diesel power boats! Have fallen in love with all electric!
Codger2 is offline   Reply With Quote
Old 10-14-2021, 10:26 AM   #4
Veteran Member
 
City: Baltimore, Maryland
Vessel Name: HAVEN
Vessel Model: Golden Star 35
Join Date: Jul 2013
Posts: 88
Thank your for your helpful reply....David
artfulltune is offline   Reply With Quote
Old 10-14-2021, 11:10 AM   #5
Guru
 
Soo-Valley's Avatar
 
City: Gulf Islands, BC Canada
Vessel Name: Soo Valley
Vessel Model: Grand Banks 36
Join Date: Jul 2019
Posts: 2,012
Don't just hook the charger +/- to one battery. + to first and - to last. The middle one will still be slightly less charge
__________________
SteveK AKA Soo Valley
You only need one working engine. That is why I have two.
Soo-Valley is offline   Reply With Quote
Old 10-14-2021, 02:39 PM   #6
DDW
Guru
 
City: San Francisco
Join Date: Apr 2018
Posts: 1,920
You should check with the battery manufacturer. Due to differences in how the BMS is designed, there is usually a limit to series or parallel connection. Their documentation should state how many of each are allowed.
DDW is offline   Reply With Quote
Old 10-17-2021, 08:10 AM   #7
Veteran Member
 
City: Jupiter
Join Date: Sep 2020
Posts: 69
I have and old ProMariner 20 amp 3 bank charger. For years, I had difficulty getting batteries fully charged until I studied the owners manual that showed connecting it to 3 individual batteries, with no indication that it could charge a bank(batteries paralleled together). I called ProMariner and they stated that it would not charge batteries paralleled properly. How the charger knows what it is charging is beyond me. I changed configurations so it charges 3 of my batteries individually and have an inverter charger for the house bank. Life is much better. So make sure your Xantrex is capable of doing what you want.
TBill36 is offline   Reply With Quote
Old 10-17-2021, 10:00 AM   #8
Veteran Member
 
City: Baltimore, Maryland
Vessel Name: HAVEN
Vessel Model: Golden Star 35
Join Date: Jul 2013
Posts: 88
TBill, Thanks for your reply. The installation/operating manual for the charger, (Xantrex 818-3015 inverter/charger) states only that multiple, parallel connected battery charging requires all be of the same type and specification. My intended purpose is to charge 3 identical Dakota 200ah 12v lithium batteries. BTW, something that SteveK suggested previously was to make the + and - connections at the outer batteries. This wasn't mentioned in the instructions, but, it does make sense. Thanks again.
artfulltune is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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


» Trawler Port Captains
Port Captains are TF volunteers who can serve as local guides or assist with local arrangements and information. Search below to locate Port Captains near your destination. To learn more about this program read here: TF Port Captain Program





All times are GMT -5. The time now is 02:56 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012