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 > Replacing 12 volt batteries with 6 volt
 Not a Member? 


Thread: Replacing 12 volt batteries with 6 volt 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)
03-15-2012 10:13 PM
justonemoreproject
Re: Replacing 12 volt batteries with 6 volt

Thanks, I'll be sure to take my ring off. One more question, my old battery is an AGM. If its in its own bank, is it OK to use it with the new 6v flooded, or does the "don't mix different battery compositions rule still apply?

Thanks - Larrt
03-15-2012 09:47 PM
mitiempo
Re: Replacing 12 volt batteries with 6 volt

Quote:
Originally Posted by justonemoreproject View Post
OK. I got 2 6v batteries. I saw some diagrams that showed 4 batteries connected both in parallel and series. Can I do that with just 2 6v and is it a good idea? Also, one of the 12v i have might still be a little tired but still working. Can I use that as a starting battery even though its worn? By the way, my switch is Blue Seas Dual Circuit Plus that is connected to a Blue Seas Battery LInk ACR. I can set it charge to any rate I want to. I guess that I should change it to a different voltage for the Trojans!
As hellosailor said you can't connect in series and parallel only with a pair. You need 12 volts so use the series connection shown below.

There is not a charge setting on a Blue Seas ACR. When it sees a voltage of 13.6 for 30 seconds or 13.0 for 90 seconds it closes to combine the battery banks in a parallel connection. It opens to separate the banks when the voltage drops to 12.35 volts for 10 seconds or 12.75 volts for 30 seconds.
When closed both battery banks are treated as one larger bank.
There is not an adjustment of any kind for charging rate. Best you read the manual.
03-15-2012 07:36 PM
hellosailor
Re: Replacing 12 volt batteries with 6 volt

"can 2 batteries be connected in series and parallel at the same time and is that a good idea."
No, that would be called a mess or a short circuit and start a fire or battery explosion. You can connect two batteries in series OR in parallel but not both at the same time.
One way doubles (combines both) the output voltage, the other doubles (combines both) the output amperage.

Be careful with the batteries, Larry. Most folks don't realize the a single 12-volt car battery can put out over 3000 amps into a short circuit, and if your wedding ring is part of that short, it will amputate your finger. A significant number of folks are blinded in the US every year when they literally blow up their car batteries while trying to jump start cars, too.

A 1/5A charger will eventually charge them, and is a good way to keep them in shape whilenot in use, but once you read the book I suspect you'll want something better.
03-15-2012 06:58 PM
justonemoreproject
Re: Replacing 12 volt batteries with 6 volt

Thanks for your help. My old batteries were connected in parallel. My question is, can 2 batteries be connected in series and parallel at the same time and is that a good idea.
Also, i have a new trickle charger that charges at 1.5 amps and will turn off when the batteries are fully charged.
As for books, I am getting the Sailboat Electronics Simplified book.

Thanks again for all your great hel!

Larry
03-15-2012 06:15 PM
hellosailor
Re: Replacing 12 volt batteries with 6 volt

"OK. I got 2 6v batteries. I saw some diagrams that showed 4 batteries ...Can I do that with just 2 6v and is it a good idea?"

You really want to get and read "The 12 volt doctor" or "the 12 volt bible" or a similar good book on boat electrics before you fry something.

It was set up for FOUR now you have TWO pretty obviously, no, you cannot set up 2 the way 4 were set. The only thing you can do with two 6v batteries is set tme up in series to make one 12v battery bank.

"I can set it charge to any rate I want to. I guess that I should change it to a different voltage for the Trojans! "
Rate is AAMPERAGE and has got nothing to do with VOLTAGE. Again, buy and read nice little book to avoid major problems. You will leave the charger set for 12v wet acid batteries, and set the rate to match the capacity of your battery bank. Which will be clear after reading the little book.

Your tied 12v battery probably will be good enough to keep as a starting battery. You may find that after equalizing it, and possibly topping up electrolyte, it is good enough for a starting battery. If not, go to Walmart, buy a properly sized starting battery and enjoy a 3-year replacement warranty and a good price.
03-15-2012 06:02 PM
justonemoreproject
Re: Replacing 12 volt batteries with 6 volt

OK. I got 2 6v batteries. I saw some diagrams that showed 4 batteries connected both in parallel and series. Can I do that with just 2 6v and is it a good idea? Also, one of the 12v i have might still be a little tired but still working. Can I use that as a starting battery even though its worn? By the way, my switch is Blue Seas Dual Circuit Plus that is connected to a Blue Seas Battery LInk ACR. I can set it charge to any rate I want to. I guess that I should change it to a different voltage for the Trojans!
03-11-2012 08:49 PM
hellosailor
Re: Replacing 12 volt batteries with 6 volt

Engine compartments are hot and full of vibration, all bad for batteries. OTOH that usually means shorter battery cables. But getting your batteries out of the heat and vibration would be a good thing.

A Group27 or even a G24 battery might be good enough as a starting battery. Cheap enough to just buy one and replace it more frequently. Apparently WalMart sells their SLI batteries with a 3-year free replacement warranty. An unscrupulous fellow might just buy one of those and after 30 months, toast it for a new one.
03-11-2012 08:27 PM
justonemoreproject
Re: Replacing 12 volt batteries with 6 volt

Thanks for the great info. I like the idea of having just 2 batteries on starboard to correct the boats trim. (she lists a little to port). Also, shedding 65 pounds would be an advantage as well, but I like the idea of having a starting battery that is shielded from running all the way down. Space is limited for a battery that is taller then a Group 27 without some modifications. I think I heard somewhere that storing batteries in the engine compartment is a bad idea. Is that correct?
03-11-2012 07:48 PM
mitiempo
Re: Replacing 12 volt batteries with 6 volt

Quote:
Originally Posted by justonemoreproject View Post
When I bought the boat, I updated the battery switch to a Blue Seas Switch that controls the rate of charging and prevents overcharging from solar and trickle chargers. for the house bank and starting battery and gives the option of choosing 1 or 2 or combining them.

Thanks for your help.

Larry
The only Blue Seas item that comes close to what you describe is their Dual Circuit Plus switch which when combined with an ACR is packaged as an Add a Battery.

It combines the batteries in parallel when a charge source is present just the same way as if they are wired together and separates them when the voltage drops below 12.35 for 10 seconds or 12.75 for 30 seconds. It does not control charging in any other way.

6 volt golf cart batteries are certainly the best value and you will have a house bank of between 225 and 240 AH depending on brand.

As posted if one of the 3 batteries toy currently have is in good condition you can keep it as a dedicated start battery.
03-11-2012 06:55 PM
hellosailor
Re: Replacing 12 volt batteries with 6 volt

Not necessarily.
"I am replacing 3 batteries that are configured as 2 for the house bank and 1 for starting with 2, 6 volt Trojan batteries"
Your two new 6V batteries can be combines into one 12v battery, or battery bank, whichever term you prefer. That one new battery can be used to replace your previous house battery bank (of 2 twelve-volt batteries) and you can always leave one of the three old batteries as a dedicated starting battery, if any of them has any life left in it.
Or, you can simply use the two new batteries as your only "battery bank" and wire it up to position 1 or 2, leaving the other one unused, on your battery switch. If you're going to do that, I'd suggest replacing the switch with a simple "On/Off" type, which eliminates any possible confusion or damage from someone selecting the wrong position (i.e. "2" if there's nothing connected to it) on the existing battery switch.
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 11:24 AM.

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.