SailNet Community - Reply to Topic

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance > Electrical Systems > understand 12v electrical
 Not a Member? 


Thread: understand 12v electrical Reply to Thread
Title:
  

By choosing to post the reply below you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Message:
Trackback:
Send Trackbacks to (Separate multiple URLs with spaces) :
Post Icons
You may choose an icon for your message from the following list:
 

Register Now

In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below


Additional Options
Miscellaneous Options

Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below


Topic Review (Newest First)
08-14-2013 02:50 PM
Stu Jackson
Re: understand 12v electrical

Ample Power Company Home Page, tech tab, download the Ample Power Primer, everything you need to know about batteries for boats.
08-13-2013 10:51 AM
SSBN506
Re: understand 12v electrical

Quote:
Originally Posted by chucklesR View Post

Put it back to 232 AH, run a equalization process via your charger (overcharge them on purpose)... and above all else do some reading on how batteries work.

If I can learn it, so can you.
That is what the reseller of the batteries suggested after talking to them. I have been doing a lot of reading on how batteries work but thanks for that sugestion also.
08-13-2013 12:12 AM
mitiempo
Re: understand 12v electrical

Quote:
Originally Posted by kentobin View Post
Battery Maintenance Facts

State of Charge Specific Gravity Voltage - 12V Voltage - 6V
100% 1.265 12.7 6.3
75% 1.225 12.4 6.2
50% 1.190 12.2 6.1
25% 1.155 12.0 6.0
Discharged 1.120 11.90 6.0
* Sulfation of Batteries starts when specific gravity falls below 1.225 or voltage measures less than 12.4 (12v Battery) or 6.2 (6 volt battery).
True, but a 20 hour test brings the battery down to 10.5 volts. The load should be 5% of battery or bank size for accuracy. If you can't get it exact don't bother trying - you already have an inaccurate AH estimation and don't need another one.

I don't expect the issue to be the batteries, but the monitor.
08-12-2013 04:17 PM
kentobin
Re: understand 12v electrical

Battery Maintenance Facts

State of Charge Specific Gravity Voltage - 12V Voltage - 6V
100% 1.265 12.7 6.3
75% 1.225 12.4 6.2
50% 1.190 12.2 6.1
25% 1.155 12.0 6.0
Discharged 1.120 11.90 6.0
* Sulfation of Batteries starts when specific gravity falls below 1.225 or voltage measures less than 12.4 (12v Battery) or 6.2 (6 volt battery).
08-12-2013 03:38 PM
SSBN506
Re: understand 12v electrical

Quote:
Originally Posted by Stu Jackson View Post
Have you considered this? From the Ample Power Primer.

Breaking in New Wet Cell Batteries: "Breaking In" New Wet Cell Batteries
My understanding is it should only be 5% to 10% off new. But I suppose if you take off 10% for new and another 10% because you never get the full rating that could be the 20 or so present I am missing.

It makes me a bit nervous discharging to 10.5 like they suggest 11.9 is empty 10.5 is dead isn't it?
08-12-2013 03:33 PM
chucklesR
Re: understand 12v electrical

Changing the AH capacity of the bank from the 232 'manufacture' capacity to 209 AH changed your state of charge by 10% because you dropped your capacity 10%.

Put it back to 232 AH, run a equalization process via your charger (overcharge them on purpose)... and above all else do some reading on how batteries work.

If I can learn it, so can you.
08-12-2013 03:16 PM
Stu Jackson
Re: understand 12v electrical

Have you considered this? From the Ample Power Primer.

Breaking in New Wet Cell Batteries: "Breaking In" New Wet Cell Batteries
08-12-2013 03:03 PM
SSBN506
Re: understand 12v electrical

Quote:
Originally Posted by hellosailor View Post
So far you've only confirmed that the batteries an dbattery monitor have different points of view. There's no reason to think the batteries would need to go back, although any battery dealer should have a load tester available to cycle and test the batteries and confirm their actual capacity. (Thousand-dollar plus computerized internal resistance testers, not just the old carbon pile load tests.)

I'd suggest you have two ways to go: Take the batteries in for testing, heavy grunt work and the risk of acid spilling and eating your cloths or something in the car (truck?).

Or, get a couple of old automobile high beams or a similar simple resistive load, and do your own real-time load tests on the batteries. With a typical 55W auto highbeam headlight (often free from the dumpster since folks tend to burn out the low beam first in dual-beam bulbs) you consume roughly (55/14.4) 3.8 amps per hour, so one of those bulbs should burn for about 26 hours to consume a real 100 amps from a battery bank. With a couple of multimeters you can confirm the amperage it is pulling and the voltage left in the battery, and you are close neough to the "nominal" 20-hour rate so thosefigures should still apply. This also gives your battery monitor a reality check versus the meters.

If the date code on the batteries (usually embossed or stamped near the top but hidden under the edge of the big label) in within the last 90 days, the odds are there's noting wrong with the batteries unless one is grossly defective.
You make sum good points. The test you suggest is basically what the battery monitor is doing from my understanding. But I se how what you suggest would be more accurate as it is not estimating. I did contact the manufacture first as I really don't what to take them out. I will se what they say before going back to the shop where I got them.

I need a proper full charge after taking 10% off the amp hours before I do anything. I have a mppt solar charger and it was still charging when I was last on so the batteries were not full. Not much sun the last few weeks. So I will go a charge of the land charger again and test.
08-12-2013 02:46 PM
hellosailor
Re: understand 12v electrical

So far you've only confirmed that the batteries an dbattery monitor have different points of view. There's no reason to think the batteries would need to go back, although any battery dealer should have a load tester available to cycle and test the batteries and confirm their actual capacity. (Thousand-dollar plus computerized internal resistance testers, not just the old carbon pile load tests.)

I'd suggest you have two ways to go: Take the batteries in for testing, heavy grunt work and the risk of acid spilling and eating your cloths or something in the car (truck?).

Or, get a couple of old automobile high beams or a similar simple resistive load, and do your own real-time load tests on the batteries. With a typical 55W auto highbeam headlight (often free from the dumpster since folks tend to burn out the low beam first in dual-beam bulbs) you consume roughly (55/14.4) 3.8 amps per hour, so one of those bulbs should burn for about 26 hours to consume a real 100 amps from a battery bank. With a couple of multimeters you can confirm the amperage it is pulling and the voltage left in the battery, and you are close neough to the "nominal" 20-hour rate so thosefigures should still apply. This also gives your battery monitor a reality check versus the meters.

If the date code on the batteries (usually embossed or stamped near the top but hidden under the edge of the big label) in within the last 90 days, the odds are there's noting wrong with the batteries unless one is grossly defective.
08-12-2013 01:16 PM
SSBN506
Re: understand 12v electrical

So I reduce the amp hours entered in the battery monitor from 232 to 209. This cause the charged to jump 10% from 75% to 85%. So it is looking like my new 6 volts may not be putting out the amp hours the monitor thinks they should. I assume if I dropped the amp hours to 185 or so I would count down from 100% properly.

I have contacted the battery manufacture first and will look into returning the batteries.

I am going to do one more charge from shore with the setting at 209 and se what happens. 10% off listed amp hours is normal but 20 to 25% seem to be to much in my mind.
This thread has more than 10 replies. Click here to review the whole thread.

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


All times are GMT -4. The time now is 05:53 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.