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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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#1
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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 |
#2
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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 |
#3
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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/ |
#4
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charge second battery
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 |
#5
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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. |
#6
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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. |
#7
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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. |
#8
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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. |
#9
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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. |
#10
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charge second battery
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 |
#11
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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) |
#13
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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. |
#14
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charge second battery
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. |
#15
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charge second battery
On Thu, 16 Dec 2010 23:39:20 GMT, (dan) wrote:
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 Look like a pretty good system - more technical info would be nice though. |
#16
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charge second battery
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 |
#17
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charge second battery
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 |
#18
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charge second battery
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 |
#19
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charge second battery
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 |
#20
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charge second battery
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 |
#21
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charge second battery
Karl Townsend 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. 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 If we have 20 knots of wind - no problem! (Don't need the motor then) -- Richard Lamb email me: web site: www.home.earthlink.net/~cavelamb |
#22
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charge second battery
"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"? |
#23
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charge second battery
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 |
#24
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charge second battery
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 |
#25
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charge second battery
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 |
#26
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charge second battery
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 |
#27
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charge second battery
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!!! |
#28
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charge second battery
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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