Reply
 
Thread Tools Display Modes
 
Old 08-29-2016, 10:49 AM   #1
Veteran Member
 
Oldersalt's Avatar
 
City: San francisco
Country: USA
Vessel Name: Pacific Star
Vessel Model: Grand Banks 32
Join Date: Jun 2016
Posts: 33
Proper "Float" Voltage?

My new-to-me 1990 GB 32 has a Xantrex Tru-Charge 40. It also has all-new flooded batteries because the older ones on the boat were totally fried. After 24 hours of charging, the charger still seems to be charging at 13+ volts. This seems high for what should be "float" voltage at this point. Could this be what killed the last set of batteries?

Any thoughts on this?

Thanks for any and all help!

Oldersalt
Happy new GB owner
__________________
Advertisement

Oldersalt is online now   Reply With Quote
Old 08-29-2016, 10:58 AM   #2
Veteran Member
 
City: Cape Coral, Fl
Country: Usa
Vessel Name: Panacea
Vessel Model: Novatec 42 Sundeck Trawler
Join Date: Jul 2016
Posts: 51
Check w/the batt maker, but sounds normal, mine is 13.2v
__________________

Panacea123 is offline   Reply With Quote
Old 08-29-2016, 11:01 AM   #3
Guru
 
Bruce B's Avatar
 
City: RI
Country: USA
Join Date: Jun 2014
Posts: 745
Quote:
Originally Posted by Oldersalt View Post
My new-to-me 1990 GB 32 has a Xantrex Tru-Charge 40. It also has all-new flooded batteries because the older ones on the boat were totally fried. After 24 hours of charging, the charger still seems to be charging at 13+ volts. This seems high for what should be "float" voltage at this point. Could this be what killed the last set of batteries?

Any thoughts on this?

Thanks for any and all help!

Oldersalt
Happy new GB owner
I would look to the battery manufacturer for this information. I know that Lifeline actually publishes a technical manual that discusses the correct voltages at various temperatures for different states of charge.

Also, some of the better charger take battery temperature into consideration when charging so you need to know how the charger is set up to have a good grasp on the situation.

Bruce
__________________
American Tug 395, hull number 12, being built!
Bruce B is online now   Reply With Quote
Old 08-29-2016, 11:05 AM   #4
TF Site Team
 
Baker's Avatar
 
City: League City, Tx
Country: Texas
Vessel Model: Carver 356
Join Date: Oct 2007
Posts: 5,116
Yep the battery maker is the best source. Mine are Odyseey so have extensive technical information on the web. Maybe yours does too. If you don't have that number then google around. I have AGM...I want to say mine float in the mid 13s.
__________________
Prairie 29...Perkins 4236...Sold
Mainship Pilot 30...Yanmar 4LHA-STP...Sold
Carver 356...T-Cummins 330B
Baker is offline   Reply With Quote
Old 08-29-2016, 11:07 AM   #5
TF Site Team
 
ksanders's Avatar
 
City: SEWARD ALASKA
Country: USA
Vessel Name: LISAS WAY
Vessel Model: BAYLINER 4788
Join Date: Feb 2011
Posts: 3,422
Flooded cells "float" at 2.15 or 2.25 volts per cell or 12.9 volts to 13.5 volts total. The exact number depends on whether the cell is a lead Calcium or a lead antimony construction.

At 13.2 volts your flooded bank is in the range I would expect it to be once fully charged.
__________________
Kevin Sanders
Bayliner 4788
Seward, Alaska
www.mvlisasway.com
ksanders is online now   Reply With Quote
Old 08-29-2016, 12:43 PM   #6
Senior Member
 
kchace's Avatar
 
City: Brookline, NH
Country: USA
Vessel Name: Blue Heaven
Vessel Model: Albin 43 classic double cabin, twin 135 Lehmans
Join Date: Sep 2013
Posts: 423
Like others have said, the best place to go for info is the manufacturer of YOUR batteries. When I need quick battery info, I usually go to the Trojan site which has a lot of detail. In their case, they recommend 13.5V for flooded battery float voltage.

Ken
kchace is offline   Reply With Quote
Old 08-29-2016, 12:46 PM   #7
Guru
 
Ski in NC's Avatar
 
City: Wilmington, NC
Country: USA
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 2,935
Mine holds 13.2 for float voltage. Batteries seem happy.
Ski in NC is offline   Reply With Quote
Old 08-30-2016, 08:38 AM   #8
Guru
 
ranger42c's Avatar
 
City: Maryland
Country: USA
Vessel Model: 42' Sportfish
Join Date: Aug 2013
Posts: 2,283
Quote:
Originally Posted by Baker View Post
Yep the battery maker is the best source. Mine are Odyseey so have extensive technical information on the web. Maybe yours does too. If you don't have that number then google around. I have AGM...I want to say mine float in the mid 13s.

Agree, info from battery maker.

At least one Odyssey ref for our batteries says 14.7 bulk/absorption and 13.6 (no more than 13.8) for float.

But each maker's specs can be slightly different, so that's the best source for OP.

-Chris
__________________
South River, Chesapeake Bay
ranger42c is offline   Reply With Quote
Old 08-30-2016, 09:02 AM   #9
Guru
 
High Wire's Avatar
 
City: Englewood, FL
Country: USA
Vessel Name: Irish Lady
Join Date: Dec 2007
Posts: 1,075
Quote:
Originally Posted by Oldersalt View Post
...because the older ones on the boat were totally fried.
Death by overcharging? Batteries die from several causes. Were the water levels maintained?
"13+" Could be ok, could be bad. Need to get digital with a DVM voltage reading directly from the battery lead posts. Generally speaking, 13.0 - 13.4 float should be ok for FLA.
__________________
Archie
1984 Monk 36 Hull #46
Englewood, FL and Cape May, NJ
High Wire is offline   Reply With Quote
Old 08-30-2016, 09:45 AM   #10
Guru
 
Heron's Avatar
 
City: Washington NC Waterfront
Country: USA
Vessel Name: Heron (2)
Vessel Model: '88 Cape Dory 28 Flybridge #115
Join Date: Nov 2014
Posts: 910
My Sterling 40 amp floats at 13V into flooded GC batteries..
__________________
Steve
Heron is offline   Reply With Quote
Old 08-30-2016, 11:15 AM   #11
Senior Member
 
Islanddreamer's Avatar
 
City: Kingsville, MD
Country: USA
Vessel Name: Slow Ride
Vessel Model: Albin 36 D/C Hull 46 Dec 1978
Join Date: Mar 2016
Posts: 153
Freedom Marine 2500W float set at 13.40. Seems to keep everything OK.
__________________

__________________
Any day aboard is a good day.
Islanddreamer is offline   Reply With Quote
Reply

Thread Tools
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





All times are GMT -5. The time now is 09:21 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012