Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work.

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Default charge second battery

I'm looking for a device and don't know what its called...

We've got two batteries on a diesel salt water boat. Looking for
something to charge the second battery only after the primary unit is
fully charged.

Right now, there is an isolator (which is just a couple large diodes)
that appears broken from years of sal****er corrosion. We're looking
to replace this. The idea here is to run the starter off one battery
and make sure its charged before going to the user battery.

Karl



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Default charge second battery

Karl Townsend pretended :
I'm looking for a device and don't know what its called...

We've got two batteries on a diesel salt water boat. Looking for
something to charge the second battery only after the primary unit is
fully charged.

Right now, there is an isolator (which is just a couple large diodes)
that appears broken from years of sal****er corrosion. We're looking
to replace this. The idea here is to run the starter off one battery
and make sure its charged before going to the user battery.

Karl


Common stuff in recreatioal vehicle world.
See the local supplier.

--
John G


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Default charge second battery


"Karl Townsend" wrote in message
...
I'm looking for a device and don't know what its called...

We've got two batteries on a diesel salt water boat. Looking for
something to charge the second battery only after the primary unit is
fully charged.

Right now, there is an isolator (which is just a couple large diodes)
that appears broken from years of sal****er corrosion. We're looking
to replace this. The idea here is to run the starter off one battery
and make sure its charged before going to the user battery.

Karl




I think this will do the trick. http://batterybuddy.com/


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On Thu, 16 Dec 2010 05:37:15 -0500, Karl Townsend
wrote:

I'm looking for a device and don't know what its called...

We've got two batteries on a diesel salt water boat. Looking for
something to charge the second battery only after the primary unit is
fully charged.

Right now, there is an isolator (which is just a couple large diodes)
that appears broken from years of sal****er corrosion. We're looking
to replace this. The idea here is to run the starter off one battery
and make sure its charged before going to the user battery.

Karl


http://www.hellroaring.com/bic75150.php
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Default charge second battery

"Karl Townsend" wrote in message
...
I'm looking for a device and don't know what its called...

We've got two batteries on a diesel salt water boat. Looking for
something to charge the second battery only after the primary unit is
fully charged.

Right now, there is an isolator (which is just a couple large diodes)
that appears broken from years of sal****er corrosion. We're looking
to replace this. The idea here is to run the starter off one battery
and make sure its charged before going to the user battery.

Karl



Its called a battery isolator. They sell them for pickups with campers all
the time.



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Default charge second battery


Karl Townsend wrote:

I'm looking for a device and don't know what its called...

We've got two batteries on a diesel salt water boat. Looking for
something to charge the second battery only after the primary unit is
fully charged.

Right now, there is an isolator (which is just a couple large diodes)
that appears broken from years of sal****er corrosion. We're looking
to replace this. The idea here is to run the starter off one battery
and make sure its charged before going to the user battery.

Karl



Battery isolators are readily available from normal marine component
sources. It is also common to use the 1, 2, 1+2 high current battery
selector switches to select the battery or batteries you want to run off
of manually.

If you use a diode type isolator, be sure to wire the sense lead from
the alternator directly to one of the batteries (doesn't matter which
one) *after* the isolator so that the charge voltage is regulated
correctly taking into account the diode voltage drop.
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Default charge second battery

On Thu, 16 Dec 2010 09:05:40 -0700, "Bob La Londe"
wrote:

"Karl Townsend" wrote in message
.. .
I'm looking for a device and don't know what its called...

We've got two batteries on a diesel salt water boat. Looking for
something to charge the second battery only after the primary unit is
fully charged.

Right now, there is an isolator (which is just a couple large diodes)
that appears broken from years of sal****er corrosion. We're looking
to replace this. The idea here is to run the starter off one battery
and make sure its charged before going to the user battery.

Karl



Its called a battery isolator. They sell them for pickups with campers all
the time.

But they do NOT function the way the OP envisions.

They charge both together, while allowing the starter to only draw
down one battery, and "house" loads to only draw down the other.

Now, if one battery is lower than the other, it WILL take the lion's
share of the charge.
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Default charge second battery

That is correct, but make certain this connection is broken when the engine is stopped or all the batteries will discharge through
that sense line. It is far better and more reliable to either use a mechanical switch or two separate alternators, one for each
system. The voltage drop across isolator diodes can be problematic.
Steve

"Pete C." wrote in message ter.com...

Karl Townsend wrote:

I'm looking for a device and don't know what its called...

We've got two batteries on a diesel salt water boat. Looking for
something to charge the second battery only after the primary unit is
fully charged.

Right now, there is an isolator (which is just a couple large diodes)
that appears broken from years of sal****er corrosion. We're looking
to replace this. The idea here is to run the starter off one battery
and make sure its charged before going to the user battery.

Karl



Battery isolators are readily available from normal marine component
sources. It is also common to use the 1, 2, 1+2 high current battery
selector switches to select the battery or batteries you want to run off
of manually.

If you use a diode type isolator, be sure to wire the sense lead from
the alternator directly to one of the batteries (doesn't matter which
one) *after* the isolator so that the charge voltage is regulated
correctly taking into account the diode voltage drop.


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Default charge second battery


Steve Lusardi wrote:

That is correct, but make certain this connection is broken when the engine is stopped or all the batteries will discharge through
that sense line.


Sense, not field.

It is far better and more reliable to either use a mechanical switch or two separate alternators, one for each
system. The voltage drop across isolator diodes can be problematic.


The 1, 2, 1+2 battery switches are very common marine items for a
reason.


Steve

"Pete C." wrote in message ter.com...

Karl Townsend wrote:

I'm looking for a device and don't know what its called...

We've got two batteries on a diesel salt water boat. Looking for
something to charge the second battery only after the primary unit is
fully charged.

Right now, there is an isolator (which is just a couple large diodes)
that appears broken from years of sal****er corrosion. We're looking
to replace this. The idea here is to run the starter off one battery
and make sure its charged before going to the user battery.

Karl



Battery isolators are readily available from normal marine component
sources. It is also common to use the 1, 2, 1+2 high current battery
selector switches to select the battery or batteries you want to run off
of manually.

If you use a diode type isolator, be sure to wire the sense lead from
the alternator directly to one of the batteries (doesn't matter which
one) *after* the isolator so that the charge voltage is regulated
correctly taking into account the diode voltage drop.

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Karl,

Find a proper marine charger with independent outputs.

There are lots of them available.

The one in my boat is a Xantrex Truecharge 20/40 and has three
separate circuits and an optional remote status panel and battery
temperature sensor.


http://www.xantrex.com/power-product...harge-2-2.aspx


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Default charge second battery

On Thu, 16 Dec 2010 14:49:33 -0600, CaveLamb
wrote:

Karl,

Find a proper marine charger with independent outputs.

There are lots of them available.

The one in my boat is a Xantrex Truecharge 20/40 and has three
separate circuits and an optional remote status panel and battery
temperature sensor.


http://www.xantrex.com/power-product...harge-2-2.aspx

You are going to have an awfull time charging the batteries on your
boat at sea with that unit. That is a "shore power" charger.(unless
there is a major feature not described in the brochure, or I realy
missed something)


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wrote:
On Thu, 16 Dec 2010 14:49:33 -0600, CaveLamb
wrote:

Karl,

Find a proper marine charger with independent outputs.

There are lots of them available.

The one in my boat is a Xantrex Truecharge 20/40 and has three
separate circuits and an optional remote status panel and battery
temperature sensor.


http://www.xantrex.com/power-product...harge-2-2.aspx
You are going to have an awfull time charging the batteries on your
boat at sea with that unit. That is a "shore power" charger.(unless
there is a major feature not described in the brochure, or I realy
missed something)



That's the one on my boat, Clare.
Not suggesting he should run out and buy one like it.

Just that marine chargers are better for the marine enviornment.
A heck of a lot better than camper stuff.

--

Richard Lamb
email me:
web site:
www.home.earthlink.net/~cavelamb

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Default charge second battery

Karl Townsend wrote in
rec.crafts.metalworking on Thu, 16 Dec 2010 05:37:15 -0500:

I'm looking for a device and don't know what its called...

We've got two batteries on a diesel salt water boat. Looking for
something to charge the second battery only after the primary unit is
fully charged.

Right now, there is an isolator (which is just a couple large diodes)
that appears broken from years of sal****er corrosion. We're looking
to replace this. The idea here is to run the starter off one battery
and make sure its charged before going to the user battery.


Isolators suck, use a battery combiner.
http://www.hellroaring.com/index.php
--

Dan H.
northshore MA.
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On Thu, 16 Dec 2010 16:28:34 -0600, CaveLamb
wrote:

wrote:
On Thu, 16 Dec 2010 14:49:33 -0600, CaveLamb
wrote:

Karl,

Find a proper marine charger with independent outputs.

There are lots of them available.

The one in my boat is a Xantrex Truecharge 20/40 and has three
separate circuits and an optional remote status panel and battery
temperature sensor.


http://www.xantrex.com/power-product...harge-2-2.aspx

You are going to have an awfull time charging the batteries on your
boat at sea with that unit. That is a "shore power" charger.(unless
there is a major feature not described in the brochure, or I realy
missed something)



That's the one on my boat, Clare.
Not suggesting he should run out and buy one like it.

Just that marine chargers are better for the marine enviornment.
A heck of a lot better than camper stuff.

But it only woprks when plugged in, right? Runs off of 120vac, not of
the engine driven charging system. OK if you have a genset on board.
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On Thu, 16 Dec 2010 16:28:34 -0600, CaveLamb
wrote:

wrote:
On Thu, 16 Dec 2010 14:49:33 -0600, CaveLamb
wrote:

Karl,

Find a proper marine charger with independent outputs.

There are lots of them available.

The one in my boat is a Xantrex Truecharge 20/40 and has three
separate circuits and an optional remote status panel and battery
temperature sensor.



we got a Pro Mariner:
ProSport20 Plus Triple 20 Amps 3 12/24/36 VDC

Does three batteries. We plan one for starter, one user and a spare
just sitting there for a failure. Getting somebody to jump you while
off shore in a 20 knot wind is a problem.

Karl

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On Thu, 16 Dec 2010 11:01:35 -0600, "Pete C."
wrote:


Karl Townsend wrote:

I'm looking for a device and don't know what its called...

We've got two batteries on a diesel salt water boat. Looking for
something to charge the second battery only after the primary unit is
fully charged.

Right now, there is an isolator (which is just a couple large diodes)
that appears broken from years of sal****er corrosion. We're looking
to replace this. The idea here is to run the starter off one battery
and make sure its charged before going to the user battery.

Karl



Battery isolators are readily available from normal marine component
sources. It is also common to use the 1, 2, 1+2 high current battery
selector switches to select the battery or batteries you want to run off
of manually.

If you use a diode type isolator, be sure to wire the sense lead from
the alternator directly to one of the batteries (doesn't matter which
one) *after* the isolator so that the charge voltage is regulated
correctly taking into account the diode voltage drop.


I haven't figured this part yet. Unlike any other alternator I've seen
there is no sense lead. Just one lead for both voltage sense and
current out. I even went to "battery man" repair shop and verified
that cummins does it this way. I was wanting to put a key switch to
the sense and can't do it. More research needed here.

Karl

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On Thu, 16 Dec 2010 05:37:15 -0500, Karl Townsend
wrote:

I'm looking for a device and don't know what its called...

We've got two batteries on a diesel salt water boat. Looking for
something to charge the second battery only after the primary unit is
fully charged.


If his boat has a problem with that, perhaps an additional auxiliary
battery would be in order, and/or a heavier duty charging system.
(complete with welding option? AR AR AR!)

http://www.zena.net/htdocs/FAQ/toreplacealt2.shtml


Right now, there is an isolator (which is just a couple large diodes)
that appears broken from years of sal****er corrosion. We're looking
to replace this. The idea here is to run the starter off one battery
and make sure its charged before going to the user battery.


Google "charge isolator", which is used in RVs.
It won't separate charging times, but they work quite well.

--
Small opportunities are often the beginning of great enterprises.
-- Demosthenes

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On Thu, 16 Dec 2010 16:03:38 -0500, wrote:

On Thu, 16 Dec 2010 14:49:33 -0600, CaveLamb
wrote:

Karl,

Find a proper marine charger with independent outputs.

There are lots of them available.

The one in my boat is a Xantrex Truecharge 20/40 and has three
separate circuits and an optional remote status panel and battery
temperature sensor.


http://www.xantrex.com/power-product...harge-2-2.aspx
You are going to have an awfull time charging the batteries on your
boat at sea with that unit. That is a "shore power" charger.(unless
there is a major feature not described in the brochure, or I realy
missed something)


I suppose floating a potato in the salt water is not an option here?

--
Small opportunities are often the beginning of great enterprises.
-- Demosthenes

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wrote:
On Thu, 16 Dec 2010 16:28:34 -0600, CaveLamb
wrote:

wrote:
On Thu, 16 Dec 2010 14:49:33 -0600, CaveLamb
wrote:

Karl,

Find a proper marine charger with independent outputs.

There are lots of them available.

The one in my boat is a Xantrex Truecharge 20/40 and has three
separate circuits and an optional remote status panel and battery
temperature sensor.


http://www.xantrex.com/power-product...harge-2-2.aspx
You are going to have an awfull time charging the batteries on your
boat at sea with that unit. That is a "shore power" charger.(unless
there is a major feature not described in the brochure, or I realy
missed something)


That's the one on my boat, Clare.
Not suggesting he should run out and buy one like it.

Just that marine chargers are better for the marine enviornment.
A heck of a lot better than camper stuff.

But it only woprks when plugged in, right? Runs off of 120vac, not of
the engine driven charging system. OK if you have a genset on board.


I do.

--

Richard Lamb
email me:
web site:
www.home.earthlink.net/~cavelamb



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"Larry Jaques" wrote in message
...


I suppose floating a potato in the salt water is not an option here?

--


Must you always think "Potty Humor"?


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On Fri, 17 Dec 2010 01:03:37 -0500, "Tom Gardner"
wrote:


"Larry Jaques" wrote in message
.. .


I suppose floating a potato in the salt water is not an option here?


Must you always think "Potty Humor"?


Sorry. I'm electrolytically challenged.

--
Small opportunities are often the beginning of great enterprises.
-- Demosthenes

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Larry Jaques wrote:
On Fri, 17 Dec 2010 01:03:37 -0500, "Tom Gardner"
wrote:


"Larry wrote in message
...


I suppose floating a potato in the salt water is not an option here?


Must you always think "Potty Humor"?


Sorry. I'm electrolytically challenged.


Don't mind Larry. He gets a charge out of this stuff.

--Winston

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On Fri, 17 Dec 2010 06:48:23 -0800, Winston
wrote:

Larry Jaques wrote:
On Fri, 17 Dec 2010 01:03:37 -0500, "Tom Gardner"
wrote:


"Larry wrote in message
...


I suppose floating a potato in the salt water is not an option here?


Must you always think "Potty Humor"?


Sorry. I'm electrolytically challenged.


Don't mind Larry. He gets a charge out of this stuff.


I'm wondering now if we're about to get clued into
"The Lesbian's Guide to the Secret Life of BIG Bakers"

--
Small opportunities are often the beginning of great enterprises.
-- Demosthenes



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On Dec 16, 5:37*am, Karl Townsend
wrote:
I'm looking for a device and don't know what its called...

We've got two batteries on a diesel salt water boat. Looking for
something to charge the second battery only after the primary unit is
fully charged.

Right now, there is an isolator (which is just a couple large diodes)
that appears broken from years of sal****er corrosion. We're looking
to replace this. The idea here is to run the starter off one battery
and make sure its charged before going to the user battery.

Karl


You want an ACR, Automatic Charging Relay...

http://bluesea.com/viewresource/1366

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Winston wrote:

Larry Jaques wrote:
On Fri, 17 Dec 2010 01:03:37 -0500, "Tom Gardner"
wrote:


"Larry wrote in message
...


I suppose floating a potato in the salt water is not an option here?


Must you always think "Potty Humor"?


Sorry. I'm electrolytically challenged.


Don't mind Larry. He gets a charge out of this stuff.



He'll see the judge on Monday. ;-)

--
For the last time: I am not a mad scientist, I'm just a very ticked off
scientist!!!
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Monkey Butler wrote:
On Dec 16, 5:37 am, Karl Townsend
wrote:
I'm looking for a device and don't know what its called...

We've got two batteries on a diesel salt water boat. Looking for
something to charge the second battery only after the primary unit is
fully charged.

Right now, there is an isolator (which is just a couple large diodes)
that appears broken from years of sal****er corrosion. We're looking
to replace this. The idea here is to run the starter off one battery
and make sure its charged before going to the user battery.

Karl


You want an ACR, Automatic Charging Relay...

http://bluesea.com/viewresource/1366



Nicely done...


--

Richard Lamb
email me:
web site:
www.home.earthlink.net/~cavelamb

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