| View previous topic :: View next topic |
| Author |
Message |
caw
Joined: 24 Dec 2008
Posts: 35
City/Region: Rupert
State or Province: ID
C-Dory Year: 2006
C-Dory Model: 23 Venture
Vessel Name: MY LEE
Photos: My Lee
|
 Posted: Thu Aug 19, 2010 11:26 pm Post subject: more battery questions |
 |
|
| This topic has probably been beaten to death----but I'm going to ask anyway. I'm buying two new batteries for my 23 Venture.When I took the old batteries out, discovered both are group 24 cranking batteries---this ain't right!!! I have the normal 4 position battery switch, no isolator or combiner. AC/DC fridge with the DC mode getting abused.Sometimes I forget to switch from cranking to house for longer than I care to admit. At some point I will add an isolator but not enough time before my next extensive trip. So, with my forgetfulness, would I be better off with two deep cycle batteries rather than one cranking and one deep cycle ---dedicate one deep cycle to cranking and one to house----until I remember to install the isolator??? |
|
| Back to top |
|
 |
Sea Wolf
Joined: 01 Nov 2003
Posts: 8650
City/Region: Redding
State or Province: CA
C-Dory Year: 1987
C-Dory Model: 22 Cruiser
Vessel Name: Sea Wolf
Photos: Sea Wolf
|
| Posted: Fri Aug 20, 2010 12:34 pm Post subject: Re: more battery questions |
|
|
| caw wrote: | | This topic has probably been beaten to death----but I'm going to ask anyway. I'm buying two new batteries for my 23 Venture.When I took the old batteries out, discovered both are group 24 cranking batteries---this ain't right!!! I have the normal 4 position battery switch, no isolator or combiner. AC/DC fridge with the DC mode getting abused.Sometimes I forget to switch from cranking to house for longer than I care to admit. At some point I will add an isolator but not enough time before my next extensive trip. [color=red]So, with my forgetfulness, would I be better off with two deep cycle batteries rather than one cranking and one deep cycle ---dedicate one deep cycle to cranking and one to house----until I remember to install the isolator???[/color] |
caw-
The standard answer I usually hear is one deep cycle for the house, and a "dual purpose" type starting/deep cycle battery for the motor, but since the starting amperages are so low for the motors we use, I prefer two deep cycles, since they're more bullet-proof being able to withstand deep discharging better.
You'd be OK with either choice.
My best guess!
Joe.  
_________________
Sea Wolf, C-Brat #31
Lake Shasta, California
  
"Most of my money I spent on boats and women. The rest I squandered'. " -Annonymous |
|
| Back to top |
|
|
Tim & Dave Kinghorn
Joined: 12 Jan 2010
Posts: 89
City/Region: El Dorado Hills
State or Province: CA
C-Dory Year: 2007
C-Dory Model: 23 Venture
Vessel Name: Sound Venture
Photos: Sound Venture
|
| Posted: Fri Aug 20, 2010 1:47 pm Post subject: Why An Isolator Instead Of A VSR? |
|
|
I agree with Wolf using a start battery doesn't do well if it gets heavy discharging/recharging. Plus, when paralleled for charging, a start battery may keep the house (deep-cycle) from becoming fully charged.
But why not use a Voltage Sensing Relay instead of an isolator? I think the VSR has many advantages over isolating diodes. The Blue Sea model can handle up to 90 amps. Most motors for the 23' Venture won't put out much more than 50 amps. Leave the selector switch on position 1 and let the VSR do the charge selection.
Tim & Dave Kinghorn
_________________
Don't let the fear of tomorrow steal from the pleasure of today. |
|
| Back to top |
|
|
Wandering Sagebrush
Joined: 21 Jan 2005
Posts: 2783
City/Region: Northeast Oregon
State or Province: OR
C-Dory Year: 2005
C-Dory Model: 22 Cruiser
Vessel Name: Constant Craving
Photos: Constant Craving
|
| Posted: Fri Aug 20, 2010 2:52 pm Post subject: Re: Why An Isolator Instead Of A VSR? |
|
|
| Tim & Dave Kinghorn wrote: | Plus, when paralleled for charging, a start battery may keep the house (deep-cycle) from becoming fully charged.
Tim & Dave Kinghorn |
I do not recommend parallel charging, regardless if the batteries are of the same type or not. If they are of different states/condition, one may prevent the other from charging, and discharge it to some degree after charging is off. |
|
| Back to top |
|
|
BrentB
Joined: 15 Jul 2006
Posts: 4420
City/Region: Greenwood
State or Province: IN
Photos: BrentB
|
| Posted: Fri Aug 20, 2010 5:18 pm Post subject: |
|
|
I have a Walmart dual purpose battery for starting my outboard
_________________
Brent Barrett |
|
| Back to top |
|
|
Wefings
Dealer
Joined: 29 Nov 2005
Posts: 2086
City/Region: Panhandle
State or Province: FL
Photos: Cruise Ship #4
|
| Posted: Sat Aug 21, 2010 7:41 am Post subject: |
|
|
These are simple and effective units from BEP via Marinco.
Marc
_________________
Wefings Marine Website
Since 1909 |
|
| Back to top |
|
|
Tug
Joined: 22 Jun 2007
Posts: 991
City/Region: Sault Ste. Marie
State or Province: ON
C-Dory Year: 1985
C-Dory Model: 22 Angler
Vessel Name: Drifter
Photos: Drifter
|
| Posted: Sun Aug 22, 2010 8:19 pm Post subject: |
|
|
| I just bought two new Group 24 batteries this month, after i told the dealer that i had a battery selector switch and could start the engine/run all accessories from either battery he recommended that i buy two deep cycle batteries. He said that they would last longer than having one starting and one deep cycle battery in my situation. Tug |
|
| Back to top |
|
|
|
Search
Private Messages
Profile
Log in
Register
Help
