Starting battery and deep cycle - charging - SailNet Community
Reply
 
LinkBack Thread Tools
post #1 of 17 Old 06-07-2009 Thread Starter
Junior Member
 
ChesapeakeCal29's Avatar
 
Join Date: Jan 2007
Location: baltimore
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Starting battery and deep cycle - charging

i have a 9hp outboard that has electric start and a alternator. it has a motorcycle battery that is dedicated for starting. it is not hooked up to the main panel. it's a nissan 9.8 and i do not believe the output voltage is regulated.

What i would like to do is charge my deep cycle battery while the motor is running.

what is the best way to accomplish this?

could i just wire them together in parallel?

is there a regulator device that completes the circuit when a charging voltage is present?
ChesapeakeCal29 is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 17 Old 06-07-2009
Senior Member
 
Join Date: Jun 2006
Posts: 5,006
Thanks: 5
Thanked 18 Times in 18 Posts
Rep Power: 12
     
Quote:
Originally Posted by ChesapeakeCal29 View Post
i have a 9hp outboard that has electric start and a alternator. it has a motorcycle battery that is dedicated for starting. it is not hooked up to the main panel. it's a nissan 9.8 and i do not believe the output voltage is regulated.

What i would like to do is charge my deep cycle battery while the motor is running.

what is the best way to accomplish this?

could i just wire them together in parallel?

is there a regulator device that completes the circuit when a charging voltage is present?
Take a look at the "Combiner question" thread on this same sub-forum, it talks about the devices you would want to do what you want to do. Basically a device that keeps your start battery charged and charges your deep cycle battery with whatever is left over.

What are you pretending not to know ?

Please support my
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
wind_magic is offline  
Quote Quick Reply Share with Facebook
post #3 of 17 Old 06-07-2009 Thread Starter
Junior Member
 
ChesapeakeCal29's Avatar
 
Join Date: Jan 2007
Location: baltimore
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
thanks, looking for something cheaper than $215. could i get some FET switch than open at 13.5 volts or something at radio shack?
ChesapeakeCal29 is offline  
Quote Quick Reply Share with Facebook
post #4 of 17 Old 06-07-2009
Senior Member
 
Join Date: Jun 2006
Posts: 5,006
Thanks: 5
Thanked 18 Times in 18 Posts
Rep Power: 12
     
Quote:
Originally Posted by ChesapeakeCal29 View Post
thanks, looking for something cheaper than $215. could i get some FET switch than open at 13.5 volts or something at radio shack?
Hmm, well, sure, I could build something out of a 0.30$us PIC processor, a resistor, a transistor, a 5vdc voltage regulator, a diode, and a relay that would allow you set your "trip points" and connect the two battery banks via a diode when they are hit, so yes it can be done inexpensively - but I suspect you wouldn't be asking if you knew how. Edit - and more importantly, the tools to do it would cost more than just buying the device if you didn't have a PIC programmer.

What are you pretending not to know ?

Please support my
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Last edited by wind_magic; 06-07-2009 at 09:32 PM.
wind_magic is offline  
Quote Quick Reply Share with Facebook
post #5 of 17 Old 06-07-2009
Senior Member
 
Join Date: Jun 2006
Posts: 5,006
Thanks: 5
Thanked 18 Times in 18 Posts
Rep Power: 12
     
Looks like someone made something similar into a kit for automobile sensors - AutoSpeed - The Simple Voltage Switch, except theirs has a pot in it so you can adjust the trip trigger without reprogramming the processor.

What are you pretending not to know ?

Please support my
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
wind_magic is offline  
Quote Quick Reply Share with Facebook
post #6 of 17 Old 06-07-2009
Senior Member
 
Join Date: Jun 2006
Posts: 5,006
Thanks: 5
Thanked 18 Times in 18 Posts
Rep Power: 12
     
ChesapeakeCal29,

You could probably get a 14v zener diode and use that to switch a relay with a simple circuit. Actually here I just found someone who is going in the right direction, maybe you could use this as a starting point - An Amplified Zener, they are using the zener to create the trip and then switching a transistor.

What are you pretending not to know ?

Please support my
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
wind_magic is offline  
Quote Quick Reply Share with Facebook
post #7 of 17 Old 06-07-2009
Telstar 28
 
sailingdog's Avatar
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 15 Times in 12 Posts
Rep Power: 14
         
The Blue Sea ACR 7160 is only about $82 or so. Marinized and well worth it.

Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
sailingdog is offline  
Quote Quick Reply Share with Facebook
post #8 of 17 Old 06-08-2009
moderate?
 
camaraderie's Avatar
 
Join Date: May 2002
Location: East Coast
Posts: 13,877
Thanks: 0
Thanked 3 Times in 3 Posts
Rep Power: 16
     
Umm...the alternator is 6 amp. MAX...less at less than full throttle. Let's say you had 100% output...unlikely...and a 100amp house battery that was 50% discharged. If you ran the engine at full throttle for 8 hours you would nearly be fully charged. The reality is that you do NOT have six amps, that some of what you do have will be lost in conversion, and you will probably have to motor for 12 hours to fully charge a 1/2 discharged battery.
This is a poor idea from the get go. Get a honda1000 to charge the battery or something similar.

No longer posting. Reach me by PM!
camaraderie is offline  
Quote Quick Reply Share with Facebook
post #9 of 17 Old 06-08-2009 Thread Starter
Junior Member
 
ChesapeakeCal29's Avatar
 
Join Date: Jan 2007
Location: baltimore
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Thanks for all the comments!

i think i will just get a switch and throw it on during motoring if the house battery drops below 11 volts or so. i have a solar thats always on too, and sail about 15 times a year, thanks for the advice! cheers
ChesapeakeCal29 is offline  
Quote Quick Reply Share with Facebook
post #10 of 17 Old 06-08-2009
Senior Member
 
Join Date: Jun 2006
Posts: 5,006
Thanks: 5
Thanked 18 Times in 18 Posts
Rep Power: 12
     
Quote:
Originally Posted by ChesapeakeCal29 View Post
Thanks for all the comments!

i think i will just get a switch and throw it on during motoring if the house battery drops below 11 volts or so. i have a solar thats always on too, and sail about 15 times a year, thanks for the advice! cheers
Nice solution, I like it.

What are you pretending not to know ?

Please support my
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
wind_magic is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

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

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:
OR

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.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Installing a New Battery Bank Sue & Larry Gear and Maintenance Articles 0 09-26-2002 08:00 PM
Boat Battery Power East Penn Manufr. Gear and Maintenance Articles 0 01-18-1999 07:00 PM

Posting Rules  
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome