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#1
posted to rec.boats
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Replacement alternator for Yanmar 1GM diesel?
Hi,
I am looking for a more efficient alternator for an old Yanmar 1GM marine diesel. The original is 35 amp and I want to have something between 50 and 60 amps. There is a bunch of webshops selling replacements but they are all 35 or 40 amp alternators. Does anyone happen to know a suitable replacement, a car alternator for example? The best solution would be an alternator that also has the sense-terminal for voltage control. -- EliasA |
#2
posted to rec.boats
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Replacement alternator for Yanmar 1GM diesel?
"Elias Aarnio" wrote in message
... Hi, I am looking for a more efficient alternator for an old Yanmar 1GM marine diesel. The original is 35 amp and I want to have something between 50 and 60 amps. There is a bunch of webshops selling replacements but they are all 35 or 40 amp alternators. Does anyone happen to know a suitable replacement, a car alternator for example? The best solution would be an alternator that also has the sense-terminal for voltage control. -- EliasA The newer single wire alternators come in a number of configurations. I would expect you can get a 60 amp one to fit. Unless you really need the external voltage control, are you splitting the charge to multiple batteries? That requirement might lessen your choices some. |
#3
posted to rec.boats
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Replacement alternator for Yanmar 1GM diesel?
On May 20, 2:06*am, Elias Aarnio wrote:
Hi, I am looking for a more efficient alternator for an old Yanmar 1GM marine diesel. The original is 35 amp and I want to have something between 50 and 60 amps. There is a bunch of webshops selling replacements but they are all 35 or 40 amp alternators. Does anyone happen to know a suitable replacement, a car alternator for example? The best solution would be an alternator that also has the sense-terminal for voltage control. -- EliasA |
#4
posted to rec.boats
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Replacement alternator for Yanmar 1GM diesel?
On May 20, 2:06*am, Elias Aarnio wrote:
Hi, I am looking for a more efficient alternator for an old Yanmar 1GM marine diesel. The original is 35 amp and I want to have something between 50 and 60 amps. There is a bunch of webshops selling replacements but they are all 35 or 40 amp alternators. Does anyone happen to know a suitable replacement, a car alternator for example? The best solution would be an alternator that also has the sense-terminal for voltage control. -- EliasA Elias, what ared you wanting to do? "Efficient" ? Your lower amp alt. will produce less drag on your engine, a higher amp takes more engine hp, to pull itself to amke more power. The Yanmars have may different types of alternators depending on the application. if you can come up with a make and alternator number it would help. now comes the question of a battery sense terminal for voltage control? are you wanting a system to adjust the voltage manually? Waht is your total application and what do you want to do with it? it helps to know.... |
#5
posted to rec.boats
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Replacement alternator for Yanmar 1GM diesel?
On May 20, 9:09*am, Tim wrote:
On May 20, 2:06*am, Elias Aarnio wrote: Hi, I am looking for a more efficient alternator for an old Yanmar 1GM marine diesel. The original is 35 amp and I want to have something between 50 and 60 amps. There is a bunch of webshops selling replacements but they are all 35 or 40 amp alternators. Does anyone happen to know a suitable replacement, a car alternator for example? The best solution would be an alternator that also has the sense-terminal for voltage control. -- EliasA Elias, what ared you wanting to do? "Efficient" ? Your lower amp alt. will produce less drag on your engine, a higher amp takes more engine hp, to pull itself to amke more power. The Yanmars have may different types of alternators depending on the application. *if you can come up with a make and alternator number it would help. now comes the question of a battery sense terminal for voltage control? are you wanting a system to adjust the voltage manually? Waht is your total application and what do you want to do with it? it helps to know.... To be exact a higher amp one does not take more engine power unless it is called on to deliver more current. I'm assuming the op has a reason he wants more current like a multiple battery installation. If not then there is no reason to go to a larger amp one. |
#6
posted to rec.boats
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Replacement alternator for Yanmar 1GM diesel?
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#7
posted to rec.boats
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Replacement alternator for Yanmar 1GM diesel?
On Wed, 21 May 2008 00:00:43 +0300, Elias Aarnio
wrote: kirjoitti: To be exact a higher amp one does not take more engine power unless it is called on to deliver more current. I'm assuming the op has a reason he wants more current like a multiple battery installation. If not then there is no reason to go to a larger amp one. Bingo. I forgot to say that I have a 60 Ah battery for cranking the diesel and 2 x 80Ah for other use. A 35A alternator is not really sufficient for this much batteries to be charged. If you charge at fifteen per cent of capacity per hour, it will take 33 amps. Cutting it too fine with a 35 amp alternator. The 20 hr rate is 11 amps. It is sufficient unless you want to abuse them by charging them too fast. Casady |
#8
posted to rec.boats
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Replacement alternator for Yanmar 1GM diesel?
Elias Aarnio wrote in news:48333bfb$0$2669$9b536df3
@news.fv.fi: kirjoitti: To be exact a higher amp one does not take more engine power unless it is called on to deliver more current. I'm assuming the op has a reason he wants more current like a multiple battery installation. If not then there is no reason to go to a larger amp one. Bingo. I forgot to say that I have a 60 Ah battery for cranking the diesel and 2 x 80Ah for other use. A 35A alternator is not really sufficient for this much batteries to be charged. The cranking battery recharges in just a few minutes as you never discharge it unless there's something wrong with the diesel, so it's not part of the problem..... 160 AH house batteries should be charged at 25% of their amp-hour rating or 40 Amps to start the recharging cycle from 50% discharge. This current soon drops off as battery voltage comes up on the regulator setting. Recharging these house batteries at more than 40A will overheat them and warp the plates, especially if you have them in the usual boater's pretty box which acts as an insulator so the poor batteries can't cool themselves by natural convection, or have them stored in the hot engine room at 180F next to the dieselbeast. Charging current must be severely reduced as battery temperature increases due to poor cooling or operation in a hot environment to prevent soft lead plates from warping, possibly leading to a cell explosion if those plates touch! If you ever get a chance to look into a boat where a battery has exploded, do so and you'll want to get rid of this stupid idea that you're going to recharge the house batteries in 30 minutes at 500 amps.....a really dumb idea that just permeates every marina you come to. I think your problem is not how much current the alternator is capable of producing, I think your problem is light duty alternator overheating if the discharged house batteries are going to pull 40A out of it for 5-6 hours before the charge starts tapering off allowing the poor alternator trying to cool itself in that HOT engineroom all sealed up, COOKING IT. 60A would be a great size, if we need to add a 20A underway power load to the charging house batteries....60A continuous duty, not a $69 cheap car/boat alternator. 60A dual rectifier alternator is around $400US, here in the states. Go to a Finnish alternator shop where you are and talk to the experts. Tell them what your constant electrical load is from all the lights and electronics pulling on the house batteries, a sort of worst case scenario, out there in the dark on a stormy night with nearly dead house batteries from leaving the engine off way too long. They'll know how much alternator you need that will survive this awful loading..... |
#9
posted to rec.boats
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Replacement alternator for Yanmar 1GM diesel?
On May 20, 9:50*am, wrote:
On May 20, 9:09*am, Tim wrote: On May 20, 2:06*am, Elias Aarnio wrote: Hi, I am looking for a more efficient alternator for an old Yanmar 1GM marine diesel. The original is 35 amp and I want to have something between 50 and 60 amps. There is a bunch of webshops selling replacements but they are all 35 or 40 amp alternators. Does anyone happen to know a suitable replacement, a car alternator for example? The best solution would be an alternator that also has the sense-terminal for voltage control. -- EliasA Elias, what ared you wanting to do? "Efficient" ? Your lower amp alt. will produce less drag on your engine, a higher amp takes more engine hp, to pull itself to amke more power. The Yanmars have may different types of alternators depending on the application. *if you can come up with a make and alternator number it would help. now comes the question of a battery sense terminal for voltage control? are you wanting a system to adjust the voltage manually? What is your total application and what do you want to do with it? it helps to know.... To be exact a higher amp one does not take more engine power unless it is called on to deliver more current. *I'm assuming the op has a reason he wants more current like a multiple battery installation. *If not then there is no reason to go to a larger amp one.- Hide quoted text - - Show quoted text - Well, actually a higher amp unit will pull more on an initial start up or with low batterie[s], but will offer a higher recovery rate to charge the batterie[s] quicker.Then there's the options that one adds to draw more power than the 30/40 amp. the more energy the alternator makes, the more energy the alternator takes. But thinking back to the 70's a '76 chevy pick up truck that was bare bones with only a heater and lights, the truck was only equipped with a 37a unit. If you had air it had a 55a.. My '76 caddie sedan deville had all the butt-wipe including rear defroster and had a stock 65a delco. so unless theres more to this thread than when I'm typing this, I don't know what the OP is trying to achieve. |
#10
posted to rec.boats
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Replacement alternator for Yanmar 1GM diesel?
Tim wrote:
Elias, what ared you wanting to do? I want to build a system that will charge the 3 batteries of my sailing boat in a reasonable time. 1 battery is only used for starting the engine. 2 other similar batteries are connected parallelly. As the main purpose is to sail, not use the engine, I want to increase the output of the alternator and control the charging process by sensing the voltage on the battery terminals. "Efficient" ? Your lower amp alt. will produce less drag on your engine, a higher amp takes more engine hp, to pull itself to amke more power. Yep. I still have the power reserve for that. The Yanmars have may different types of alternators depending on the application. if you can come up with a make and alternator number it would help. I have to check it out. now comes the question of a battery sense terminal for voltage control? are you wanting a system to adjust the voltage manually? Not necessarily. I only use lead batteries so they all have the same voltage. I still want to compensate the 0,7 volt voltage loss caused by the battery isolator. -- EliasA |
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