Starting battery and deep cycle - charging - SailNet Community

   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
 Not a Member? 
  #1  
Old 06-07-2009
ChesapeakeCal29's Avatar
Junior Member
 
Join Date: Jan 2007
Location: baltimore
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
ChesapeakeCal29 is on a distinguished road
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?
Reply With Quote Share with Facebook
  #2  
Old 06-07-2009
Senior Member
 
Join Date: Jun 2006
Posts: 4,998
Thanks: 5
Thanked 18 Times in 18 Posts
Rep Power: 11
wind_magic has a spectacular aura about wind_magic has a spectacular aura about wind_magic has a spectacular aura about
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.
Reply With Quote Share with Facebook
  #3  
Old 06-07-2009
ChesapeakeCal29's Avatar
Junior Member
 
Join Date: Jan 2007
Location: baltimore
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
ChesapeakeCal29 is on a distinguished road
thanks, looking for something cheaper than $215. could i get some FET switch than open at 13.5 volts or something at radio shack?
Reply With Quote Share with Facebook
  #4  
Old 06-07-2009
Senior Member
 
Join Date: Jun 2006
Posts: 4,998
Thanks: 5
Thanked 18 Times in 18 Posts
Rep Power: 11
wind_magic has a spectacular aura about wind_magic has a spectacular aura about wind_magic has a spectacular aura about
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.
Reply With Quote Share with Facebook
  #5  
Old 06-07-2009
Senior Member
 
Join Date: Jun 2006
Posts: 4,998
Thanks: 5
Thanked 18 Times in 18 Posts
Rep Power: 11
wind_magic has a spectacular aura about wind_magic has a spectacular aura about wind_magic has a spectacular aura about
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.
Reply With Quote Share with Facebook
  #6  
Old 06-07-2009
Senior Member
 
Join Date: Jun 2006
Posts: 4,998
Thanks: 5
Thanked 18 Times in 18 Posts
Rep Power: 11
wind_magic has a spectacular aura about wind_magic has a spectacular aura about wind_magic has a spectacular aura about
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.
Reply With Quote Share with Facebook
  #7  
Old 06-07-2009
sailingdog's Avatar
Telstar 28
 
Join Date: Mar 2006
Location: New England
Posts: 43,291
Thanks: 0
Thanked 11 Times in 11 Posts
Rep Power: 13
sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice
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.
Reply With Quote Share with Facebook
  #8  
Old 06-08-2009
camaraderie's Avatar
moderate?
 
Join Date: May 2002
Location: East Coast
Posts: 13,877
Thanks: 0
Thanked 3 Times in 3 Posts
Rep Power: 15
camaraderie is a jewel in the rough camaraderie is a jewel in the rough camaraderie is a jewel in the rough
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!
Reply With Quote Share with Facebook
  #9  
Old 06-08-2009
ChesapeakeCal29's Avatar
Junior Member
 
Join Date: Jan 2007
Location: baltimore
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
ChesapeakeCal29 is on a distinguished road
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
Reply With Quote Share with Facebook
  #10  
Old 06-08-2009
Senior Member
 
Join Date: Jun 2006
Posts: 4,998
Thanks: 5
Thanked 18 Times in 18 Posts
Rep Power: 11
wind_magic has a spectacular aura about wind_magic has a spectacular aura about wind_magic has a spectacular aura about
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.
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
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


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


All times are GMT -4. The time now is 10:04 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.