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Default Boat and Batteries and Charging, Oh, my!

On Tue, 15 Mar 2016 11:57:40 -0700 (PDT), Tim wrote:

"
Without an alternator, though, I'm worried about leaving it at a slip.
I have an accessory battery, so I'm not worried about getting
stranded, but running lights and a stereo take up juice. "

Why no alternator? I'm not following...


I'm glad you asked that. I was going to do so, but then thought it might somehow be a
real stupid question.
--

Ban liars, tax cheats, idiots, audiophools, and narcissists...not guns!
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Default Boat and Batteries and Charging, Oh, my!

On 3/15/2016 2:42 PM, John H. wrote:
On Tue, 15 Mar 2016 11:57:40 -0700 (PDT), Tim wrote:

"
Without an alternator, though, I'm worried about leaving it at a slip.
I have an accessory battery, so I'm not worried about getting
stranded, but running lights and a stereo take up juice. "

Why no alternator? I'm not following...


I'm glad you asked that. I was going to do so, but then thought it might somehow be a
real stupid question.
--

Ban liars, tax cheats, idiots, audiophools, and narcissists...not guns!


I'm the one asking the stupid questions, I'm sure. I'm the novice
here, compared to most of you folks.

Okay, I should use the proper terms, I suppose. Its a 1985 Mercury 75.
I do have electric start, but my understanding is that on older
engines, a stator/vr is only to trickle charge the starting battery, and
only does that at high RPMs?


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Posts: 8,663
Default Boat and Batteries and Charging, Oh, my!

On Tue, 15 Mar 2016 15:54:11 -0500, "Ryan P." wrote:

On 3/15/2016 2:42 PM, John H. wrote:
On Tue, 15 Mar 2016 11:57:40 -0700 (PDT), Tim wrote:

"
Without an alternator, though, I'm worried about leaving it at a slip.
I have an accessory battery, so I'm not worried about getting
stranded, but running lights and a stereo take up juice. "

Why no alternator? I'm not following...


I'm glad you asked that. I was going to do so, but then thought it might somehow be a
real stupid question.
--

Ban liars, tax cheats, idiots, audiophools, and narcissists...not guns!


I'm the one asking the stupid questions, I'm sure. I'm the novice
here, compared to most of you folks.

Okay, I should use the proper terms, I suppose. Its a 1985 Mercury 75.
I do have electric start, but my understanding is that on older
engines, a stator/vr is only to trickle charge the starting battery, and
only does that at high RPMs?


Tim should be able to jump all over that one!

Go Tim!
--

Ban liars, tax cheats, idiots, audiophools, and narcissists...not guns!
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First recorded activity by BoatBanter: Jul 2007
Posts: 36,387
Default Boat and Batteries and Charging, Oh, my!

On Tue, 15 Mar 2016 15:54:11 -0500, "Ryan P."
wrote:

On 3/15/2016 2:42 PM, John H. wrote:
On Tue, 15 Mar 2016 11:57:40 -0700 (PDT), Tim wrote:

"
Without an alternator, though, I'm worried about leaving it at a slip.
I have an accessory battery, so I'm not worried about getting
stranded, but running lights and a stereo take up juice. "

Why no alternator? I'm not following...


I'm glad you asked that. I was going to do so, but then thought it might somehow be a
real stupid question.
--

Ban liars, tax cheats, idiots, audiophools, and narcissists...not guns!


I'm the one asking the stupid questions, I'm sure. I'm the novice
here, compared to most of you folks.

Okay, I should use the proper terms, I suppose. Its a 1985 Mercury 75.
I do have electric start, but my understanding is that on older
engines, a stator/vr is only to trickle charge the starting battery, and
only does that at high RPMs?


I was guessing that you had one without a charging system. That old 75
has a 9 amp alternator in the stator. If it is working, it will keep
your battery up if you are running it fairly often. It will put out
pretty well at anything much over an idle. (I had one)
  #5   Report Post  
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First recorded activity by BoatBanter: Aug 2015
Posts: 114
Default Boat and Batteries and Charging, Oh, my!

On 3/15/2016 4:22 PM, wrote:
On Tue, 15 Mar 2016 15:54:11 -0500, "Ryan P."
wrote:

On 3/15/2016 2:42 PM, John H. wrote:
On Tue, 15 Mar 2016 11:57:40 -0700 (PDT), Tim wrote:

"
Without an alternator, though, I'm worried about leaving it at a slip.
I have an accessory battery, so I'm not worried about getting
stranded, but running lights and a stereo take up juice. "

Why no alternator? I'm not following...

I'm glad you asked that. I was going to do so, but then thought it might somehow be a
real stupid question.
--

Ban liars, tax cheats, idiots, audiophools, and narcissists...not guns!


I'm the one asking the stupid questions, I'm sure. I'm the novice
here, compared to most of you folks.

Okay, I should use the proper terms, I suppose. Its a 1985 Mercury 75.
I do have electric start, but my understanding is that on older
engines, a stator/vr is only to trickle charge the starting battery, and
only does that at high RPMs?


I was guessing that you had one without a charging system. That old 75
has a 9 amp alternator in the stator. If it is working, it will keep
your battery up if you are running it fairly often. It will put out
pretty well at anything much over an idle. (I had one)


But can I link that to the "house" battery? If I jump the starter
battery and the house battery together, won't the house battery draw
down the starter?


  #6   Report Post  
posted to rec.boats
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First recorded activity by BoatBanter: Jul 2007
Posts: 36,387
Default Boat and Batteries and Charging, Oh, my!

On Wed, 16 Mar 2016 08:01:41 -0500, "Ryan P."
wrote:

On 3/15/2016 4:22 PM, wrote:
On Tue, 15 Mar 2016 15:54:11 -0500, "Ryan P."
wrote:

On 3/15/2016 2:42 PM, John H. wrote:
On Tue, 15 Mar 2016 11:57:40 -0700 (PDT), Tim wrote:

"
Without an alternator, though, I'm worried about leaving it at a slip.
I have an accessory battery, so I'm not worried about getting
stranded, but running lights and a stereo take up juice. "

Why no alternator? I'm not following...

I'm glad you asked that. I was going to do so, but then thought it might somehow be a
real stupid question.
--

Ban liars, tax cheats, idiots, audiophools, and narcissists...not guns!

I'm the one asking the stupid questions, I'm sure. I'm the novice
here, compared to most of you folks.

Okay, I should use the proper terms, I suppose. Its a 1985 Mercury 75.
I do have electric start, but my understanding is that on older
engines, a stator/vr is only to trickle charge the starting battery, and
only does that at high RPMs?


I was guessing that you had one without a charging system. That old 75
has a 9 amp alternator in the stator. If it is working, it will keep
your battery up if you are running it fairly often. It will put out
pretty well at anything much over an idle. (I had one)


But can I link that to the "house" battery? If I jump the starter
battery and the house battery together, won't the house battery draw
down the starter?


Battery switch or isolator. BTW don't run in "both" on a battery
switch. Charge one, then the other. It is the only way to reliably
charge 2 batteries if you are not using an isolator and still the best
way. Both is really just an artifact of the "make before break" design
of the switch but it might be useful if both batteries are down and
between them you have enough to kick over the motor. It is the only
real use.
  #7   Report Post  
posted to rec.boats
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First recorded activity by BoatBanter: Aug 2015
Posts: 114
Default Boat and Batteries and Charging, Oh, my!

On 3/16/2016 10:36 AM, wrote:
On Wed, 16 Mar 2016 08:01:41 -0500, "Ryan P."
wrote:

On 3/15/2016 4:22 PM,
wrote:
On Tue, 15 Mar 2016 15:54:11 -0500, "Ryan P."
wrote:

On 3/15/2016 2:42 PM, John H. wrote:
On Tue, 15 Mar 2016 11:57:40 -0700 (PDT), Tim wrote:

"
Without an alternator, though, I'm worried about leaving it at a slip.
I have an accessory battery, so I'm not worried about getting
stranded, but running lights and a stereo take up juice. "

Why no alternator? I'm not following...

I'm glad you asked that. I was going to do so, but then thought it might somehow be a
real stupid question.
--

Ban liars, tax cheats, idiots, audiophools, and narcissists...not guns!

I'm the one asking the stupid questions, I'm sure. I'm the novice
here, compared to most of you folks.

Okay, I should use the proper terms, I suppose. Its a 1985 Mercury 75.
I do have electric start, but my understanding is that on older
engines, a stator/vr is only to trickle charge the starting battery, and
only does that at high RPMs?


I was guessing that you had one without a charging system. That old 75
has a 9 amp alternator in the stator. If it is working, it will keep
your battery up if you are running it fairly often. It will put out
pretty well at anything much over an idle. (I had one)


But can I link that to the "house" battery? If I jump the starter
battery and the house battery together, won't the house battery draw
down the starter?


Battery switch or isolator. BTW don't run in "both" on a battery
switch. Charge one, then the other. It is the only way to reliably
charge 2 batteries if you are not using an isolator and still the best
way. Both is really just an artifact of the "make before break" design
of the switch but it might be useful if both batteries are down and
between them you have enough to kick over the motor. It is the only
real use.


I'll throw a volt meter on the battery and make sure the charging
system is working properly when I take her out of storage in a few
weeks. A battery switch is pretty simple to install... If its really
producing 9amps, that should be more than enough to keep the house
battery alive if I let it charge while pulling kids on the tube or whatever.
  #8   Report Post  
posted to rec.boats
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First recorded activity by BoatBanter: Jul 2007
Posts: 36,387
Default Boat and Batteries and Charging, Oh, my!

On Wed, 16 Mar 2016 13:34:54 -0500, "Ryan P."
wrote:

On 3/16/2016 10:36 AM, wrote:
On Wed, 16 Mar 2016 08:01:41 -0500, "Ryan P."
wrote:

On 3/15/2016 4:22 PM,
wrote:
On Tue, 15 Mar 2016 15:54:11 -0500, "Ryan P."
wrote:

On 3/15/2016 2:42 PM, John H. wrote:
On Tue, 15 Mar 2016 11:57:40 -0700 (PDT), Tim wrote:

"
Without an alternator, though, I'm worried about leaving it at a slip.
I have an accessory battery, so I'm not worried about getting
stranded, but running lights and a stereo take up juice. "

Why no alternator? I'm not following...

I'm glad you asked that. I was going to do so, but then thought it might somehow be a
real stupid question.
--

Ban liars, tax cheats, idiots, audiophools, and narcissists...not guns!

I'm the one asking the stupid questions, I'm sure. I'm the novice
here, compared to most of you folks.

Okay, I should use the proper terms, I suppose. Its a 1985 Mercury 75.
I do have electric start, but my understanding is that on older
engines, a stator/vr is only to trickle charge the starting battery, and
only does that at high RPMs?


I was guessing that you had one without a charging system. That old 75
has a 9 amp alternator in the stator. If it is working, it will keep
your battery up if you are running it fairly often. It will put out
pretty well at anything much over an idle. (I had one)


But can I link that to the "house" battery? If I jump the starter
battery and the house battery together, won't the house battery draw
down the starter?


Battery switch or isolator. BTW don't run in "both" on a battery
switch. Charge one, then the other. It is the only way to reliably
charge 2 batteries if you are not using an isolator and still the best
way. Both is really just an artifact of the "make before break" design
of the switch but it might be useful if both batteries are down and
between them you have enough to kick over the motor. It is the only
real use.


I'll throw a volt meter on the battery and make sure the charging
system is working properly when I take her out of storage in a few
weeks. A battery switch is pretty simple to install... If its really
producing 9amps, that should be more than enough to keep the house
battery alive if I let it charge while pulling kids on the tube or whatever.



  #9   Report Post  
posted to rec.boats
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First recorded activity by BoatBanter: Jul 2007
Posts: 36,387
Default Boat and Batteries and Charging, Oh, my!

On Wed, 16 Mar 2016 13:34:54 -0500, "Ryan P."
wrote:

On 3/16/2016 10:36 AM, wrote:
On Wed, 16 Mar 2016 08:01:41 -0500, "Ryan P."
wrote:

On 3/15/2016 4:22 PM,
wrote:
On Tue, 15 Mar 2016 15:54:11 -0500, "Ryan P."
wrote:

On 3/15/2016 2:42 PM, John H. wrote:
On Tue, 15 Mar 2016 11:57:40 -0700 (PDT), Tim wrote:

"
Without an alternator, though, I'm worried about leaving it at a slip.
I have an accessory battery, so I'm not worried about getting
stranded, but running lights and a stereo take up juice. "

Why no alternator? I'm not following...

I'm glad you asked that. I was going to do so, but then thought it might somehow be a
real stupid question.
--

Ban liars, tax cheats, idiots, audiophools, and narcissists...not guns!

I'm the one asking the stupid questions, I'm sure. I'm the novice
here, compared to most of you folks.

Okay, I should use the proper terms, I suppose. Its a 1985 Mercury 75.
I do have electric start, but my understanding is that on older
engines, a stator/vr is only to trickle charge the starting battery, and
only does that at high RPMs?


I was guessing that you had one without a charging system. That old 75
has a 9 amp alternator in the stator. If it is working, it will keep
your battery up if you are running it fairly often. It will put out
pretty well at anything much over an idle. (I had one)


But can I link that to the "house" battery? If I jump the starter
battery and the house battery together, won't the house battery draw
down the starter?


Battery switch or isolator. BTW don't run in "both" on a battery
switch. Charge one, then the other. It is the only way to reliably
charge 2 batteries if you are not using an isolator and still the best
way. Both is really just an artifact of the "make before break" design
of the switch but it might be useful if both batteries are down and
between them you have enough to kick over the motor. It is the only
real use.


I'll throw a volt meter on the battery and make sure the charging
system is working properly when I take her out of storage in a few
weeks. A battery switch is pretty simple to install... If its really
producing 9amps, that should be more than enough to keep the house
battery alive if I let it charge while pulling kids on the tube or whatever.


If you install a voltage meter on the motor side of the battery
switch, you can monitor the one it is charging and get a very good
idea of the state of the charge. Those are fairly primitive systems
and most don't even have regulators so when the voltage gets up around
14, the battery is charged. Switch over to the other one.
  #10   Report Post  
posted to rec.boats
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First recorded activity by BoatBanter: Feb 2016
Posts: 211
Default Boat and Batteries and Charging, Oh, my!

Ryan P. wrote:
On 3/16/2016 10:36 AM, wrote:
On Wed, 16 Mar 2016 08:01:41 -0500, "Ryan P."
wrote:

On 3/15/2016 4:22 PM,
wrote:
On Tue, 15 Mar 2016 15:54:11 -0500, "Ryan P."
wrote:

On 3/15/2016 2:42 PM, John H. wrote:
On Tue, 15 Mar 2016 11:57:40 -0700 (PDT), Tim
wrote:

"
Without an alternator, though, I'm worried about leaving it
at a slip.
I have an accessory battery, so I'm not worried about getting
stranded, but running lights and a stereo take up juice. "

Why no alternator? I'm not following...

I'm glad you asked that. I was going to do so, but then thought
it might somehow be a
real stupid question.
--

Ban liars, tax cheats, idiots, audiophools, and narcissists...not
guns!

I'm the one asking the stupid questions, I'm sure. I'm the novice
here, compared to most of you folks.

Okay, I should use the proper terms, I suppose. Its a 1985
Mercury 75.
I do have electric start, but my understanding is that on older
engines, a stator/vr is only to trickle charge the starting
battery, and
only does that at high RPMs?


I was guessing that you had one without a charging system. That old 75
has a 9 amp alternator in the stator. If it is working, it will keep
your battery up if you are running it fairly often. It will put out
pretty well at anything much over an idle. (I had one)


But can I link that to the "house" battery? If I jump the starter
battery and the house battery together, won't the house battery draw
down the starter?


Battery switch or isolator. BTW don't run in "both" on a battery
switch. Charge one, then the other. It is the only way to reliably
charge 2 batteries if you are not using an isolator and still the best
way. Both is really just an artifact of the "make before break" design
of the switch but it might be useful if both batteries are down and
between them you have enough to kick over the motor. It is the only
real use.


I'll throw a volt meter on the battery and make sure the charging
system is working properly when I take her out of storage in a few
weeks. A battery switch is pretty simple to install... If its really
producing 9amps, that should be more than enough to keep the house
battery alive if I let it charge while pulling kids on the tube or
whatever.



What you need for your application is a battery combiner. I have one on
my bass boat and it works great. It will keep the starting battery
topped off and then switch to the house battery - or in my case the
deep-cycle trolling motor battery. Here's just one example:

http://www.charlesindustries.com/main/battcom.html


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