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AC to DC Converter
Hello, I use a 12 volt winch to pull my boat up on a marine railway at
my seasonal cottage in Canada. I do not have permanent AC power to the location, but can get a big enough extension cord to it if need be. I want to buy a more powerful winch which requires a battery rated at "12 VDC - 650 Cold Cranking Amps" which is not a problem. I would like to buy a back-up 12 volt AC to DC converter to power the winch if the battery fails. Please advise on how to rate the converter based on the battery requirement. Much thanks! D. MacQueen. |
AC to DC Converter
650 amps at 12 volts is 6500+1300=7800 watts of power, DC.
The rectifier (converting AC to DC) as well as a transformer (step down from AC power voltage to 12 volts DC) will have some losses as well. I believe that you will find such a rectifier to be impossibly expensive for such an application. So costly that several alternatives become affordable: - Another battery, kept charged - A small winch driven by a suitably geared gasoline engine - A suitable tow line capable of attachment to a vehicle There is no information regarding the anticipated current drawn by the winch at stall speed, nor is the effective load of the boat (including both friction drag and angle of incline on the railway). Surely the winch does not demand maximum battery current along the entire hauling path. On 13 Nov 2006 17:50:52 -0800, wrote: Hello, I use a 12 volt winch to pull my boat up on a marine railway at my seasonal cottage in Canada. I do not have permanent AC power to the location, but can get a big enough extension cord to it if need be. I want to buy a more powerful winch which requires a battery rated at "12 VDC - 650 Cold Cranking Amps" which is not a problem. I would like to buy a back-up 12 volt AC to DC converter to power the winch if the battery fails. Please advise on how to rate the converter based on the battery requirement. Much thanks! D. MacQueen. |
AC to DC Converter
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AC to DC Converter
buy a large battery charger. I have one with 200 amp boost. My 200 amp
boost charger will start my van with a stone dead battery. cranking my caravans engine at zero degrees a winch will be childs play |
AC to DC Converter
buy a large battery charger. I have one with 200 amp boost. My 200 amp
boost charger will start my van with a stone dead battery. cranking my caravans engine at zero degrees a winch will be childs play |
AC to DC Converter
I would like to
buy a back-up 12 volt AC to DC converter to power the winch if the battery fails. Please advise on how to rate the converter based on the battery requirement. The battery doesn't tell you the motor requirements. All you know is that it exceeds them. DC power supplies are expensive. Upwards of $1 per watt, and you need many hundreds of watts. Why bother at all? Just borrow a battery from another vehicle if yours fails. Even a spare battery would be far cheaper than a DC power supply. |
AC to DC Converter
In article .com,
wrote: Hello, I use a 12 volt winch to pull my boat up on a marine railway at my seasonal cottage in Canada. I do not have permanent AC power to the location, but can get a big enough extension cord to it if need be. I want to buy a more powerful winch which requires a battery rated at "12 VDC - 650 Cold Cranking Amps" which is not a problem. I would like to buy a back-up 12 volt AC to DC converter to power the winch if the battery fails. Please advise on how to rate the converter based on the battery requirement. Much thanks! D. MacQueen. Unfortunately, Cold Cranking Amps is a measure of battery capacity to store energy, not an indication of how much current it can supply at any given time. See if you can find an actual current requirement on the winch, i.e. number of amps. If not, you would be better off buying an automotive battery recharger. One that is capable of 'boosting' or starting a vehicle, would have no problem running a 12V winch. For that matter, if you can get your car close enough, you could use a good set of jumper cables from the car battery to power the winch. -- Contentment makes poor men rich. Discontent makes rich men poor. --Benjamin Franklin Larry Wasserman - Baltimore, Maryland - |
AC to DC Converter
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AC to DC Converter
As others have pointed out, the CCA rating doesn't help. I suggest you
buy a cheap ammeter at the auto parts store and measure the current draw of your new winch, (including when it is locked - trying to pull something that simply won't move.) Then you can consider whether to buy a battery charger, extra battery, or AC-DC converter. wrote: Hello, I use a 12 volt winch to pull my boat up on a marine railway at my seasonal cottage in Canada. I do not have permanent AC power to the location, but can get a big enough extension cord to it if need be. I want to buy a more powerful winch which requires a battery rated at "12 VDC - 650 Cold Cranking Amps" which is not a problem. I would like to buy a back-up 12 volt AC to DC converter to power the winch if the battery fails. Please advise on how to rate the converter based on the battery requirement. Much thanks! D. MacQueen. |
AC to DC Converter
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AC to DC Converter
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AC to DC Converter
Your math doesn't addup. Watts equals amps times volts.
Be nice to know the actual current draw of the winch under full load. The battery charger with the 12 volt boost setting sounds like one good answer. Spare battery sounds even better. -- Christopher A. Young You can't shout down a troll. You have to starve them. .. "Tom Kendrick" wrote in message ... 650 amps at 12 volts is 6500+1300=7800 watts of power, DC. The rectifier (converting AC to DC) as well as a transformer (step down from AC power voltage to 12 volts DC) will have some losses as well. I believe that you will find such a rectifier to be impossibly expensive for such an application. So costly that several alternatives become affordable: - Another battery, kept charged - A small winch driven by a suitably geared gasoline engine - A suitable tow line capable of attachment to a vehicle There is no information regarding the anticipated current drawn by the winch at stall speed, nor is the effective load of the boat (including both friction drag and angle of incline on the railway). Surely the winch does not demand maximum battery current along the entire hauling path. |
AC to DC Converter
Oddly enough, cold cranking amps *IS* a measure of how much amperage
it can supply. If you want the total battery capacity, you want the "reserve capacity" which is often expressed as 90 minutes at 25 amps. -- Christopher A. Young You can't shout down a troll. You have to starve them. .. wrote in message ... Unfortunately, Cold Cranking Amps is a measure of battery capacity to store energy, not an indication of how much current it can supply at any given time. See if you can find an actual current requirement on the winch, i.e. number of amps. If not, you would be better off buying an automotive battery recharger. One that is capable of 'boosting' or starting a vehicle, would have no problem running a 12V winch. For that matter, if you can get your car close enough, you could use a good set of jumper cables from the car battery to power the winch. -- Contentment makes poor men rich. Discontent makes rich men poor. --Benjamin Franklin Larry Wasserman - Baltimore, Maryland - |
AC to DC Converter
Stormin Mormon wrote:
Your math doesn't addup. Watts equals amps times volts. I think that's what he did. 650*12=650*(10+2)=6500+1300=7800 Be nice to know the actual current draw of the winch under full load. The battery charger with the 12 volt boost setting sounds like one good answer. Spare battery sounds even better. -- The e-mail address in our reply-to line is reversed in an attempt to minimize spam. Our true address is of the form . |
AC to DC Converter
On Tue, 14 Nov 2006 18:39:05 GMT, "Stormin Mormon"
wrote: Oddly enough, cold cranking amps *IS* a measure of how much amperage it can supply. For a limited time, just enough time to start an engine. If you want the total battery capacity, you want the "reserve capacity" which is often expressed as 90 minutes at 25 amps. -- Christopher A. Young You can't shout down a troll. You have to starve them. . wrote in message .. . Unfortunately, Cold Cranking Amps is a measure of battery capacity to store energy, not an indication of how much current it can supply at any given time. See if you can find an actual current requirement on the winch, i.e. number of amps. If not, you would be better off buying an automotive battery recharger. One that is capable of 'boosting' or starting a vehicle, would have no problem running a 12V winch. For that matter, if you can get your car close enough, you could use a good set of jumper cables from the car battery to power the winch. -- 41 days until the winter solstice celebration Mark Lloyd http://notstupid.laughingsquid.com "All your western theologies, the whole mythology of them, are based on the concept of God as a senile delinquent." -- Tennessee Williams |
AC to DC Converter
Mark Lloyd wrote:
On Tue, 14 Nov 2006 18:39:05 GMT, "Stormin Mormon" wrote: Oddly enough, cold cranking amps *IS* a measure of how much amperage it can supply. For a limited time, just enough time to start an engine. How long does it take to winch a boat? If you want the total battery capacity, you want the "reserve capacity" which is often expressed as 90 minutes at 25 amps. -- Christopher A. Young You can't shout down a troll. You have to starve them. . wrote in message . .. Unfortunately, Cold Cranking Amps is a measure of battery capacity to store energy, not an indication of how much current it can supply at any given time. See if you can find an actual current requirement on the winch, i.e. number of amps. If not, you would be better off buying an automotive battery recharger. One that is capable of 'boosting' or starting a vehicle, would have no problem running a 12V winch. For that matter, if you can get your car close enough, you could use a good set of jumper cables from the car battery to power the winch. -- The e-mail address in our reply-to line is reversed in an attempt to minimize spam. Our true address is of the form . |
AC to DC Converter
On Tue, 14 Nov 2006 02:30:09 GMT, Tom Kendrick
wrote: 650 amps at 12 volts is 6500+1300=7800 watts of power, DC. I don't think a 650 CCA battery puts out 650 amps at one time. Everything would melt. To the OP, I don't think it is called a converter unless it goes from DC to AC. From AC to DC it is called a rectifier, even if that is only part of it. .... On 13 Nov 2006 17:50:52 -0800, wrote: Hello, I use a 12 volt winch to pull my boat up on a marine railway at my seasonal cottage in Canada. I do not have permanent AC power to the location, but can get a big enough extension cord to it if need be. I want to buy a more powerful winch which requires a battery rated at "12 VDC - 650 Cold Cranking Amps" which is not a problem. I would like to buy a back-up 12 volt AC to DC converter to power the winch if the battery fails. Please advise on how to rate the converter based on the battery requirement. Much thanks! D. MacQueen. |
AC to DC Converter
According to mm :
I don't think a 650 CCA battery puts out 650 amps at one time. Everything would melt. It _can_, more or less. Whether it'll melt is up to how you've connected it. To the OP, I don't think it is called a converter unless it goes from DC to AC. From AC to DC it is called a rectifier, even if that is only part of it. The OP is using informal terminology. "Converting 120VAC to 12VDC" is what he's trying to do. A rectifier converts AC to DC, but without a voltage change. -- Chris Lewis, Age and Treachery will Triumph over Youth and Skill It's not just anyone who gets a Starship Cruiser class named after them. |
AC to DC Converter
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AC to DC Converter
According to Bennett Price :
As others have pointed out, the CCA rating doesn't help. I suggest you buy a cheap ammeter at the auto parts store and measure the current draw of your new winch, (including when it is locked - trying to pull something that simply won't move.) Then you can consider whether to buy a battery charger, extra battery, or AC-DC converter. Trying to stall a winch can be rather hazardous. Finding the amp rating of a comparable winch should serve for a good ballpark number. -- Chris Lewis, Age and Treachery will Triumph over Youth and Skill It's not just anyone who gets a Starship Cruiser class named after them. |
AC to DC Converter
On Fri, 17 Nov 2006 03:37:06 -0000, (Chris
Lewis) wrote: According to : buy a large battery charger. I have one with 200 amp boost. My 200 amp boost charger will start my van with a stone dead battery. cranking my caravans engine at zero degrees a winch will be childs play I seem to recall somewhere reading that 12V winches draw anywhere from 50 to 200A. Boost chargers are rated for highly intermittent operation, after which they have to cool down. A practically small boost charger for 100-200A will only be able to deliver that for a matter of seconds. For the cost of a boost charger capable of running for longer than that, you can buy several spare car batteries, and the batteries would weigh less. Yes, get some batteries. Store them charged. -- 38 days until the winter solstice celebration Mark Lloyd http://notstupid.laughingsquid.com "All your western theologies, the whole mythology of them, are based on the concept of God as a senile delinquent." -- Tennessee Williams |
AC to DC Converter
Yes, get some batteries. Store them charged. -- 38 days until the winter solstice celebration Mark Lloyd http://notstupid.laughingsquid.com batteries large enough limit it to lead acid, which have a finite life with declining poer over time, shouldnt be stored discharged and they go dead just sitting around and after such discharge dont recover their previous capacity...... probably better off with a 12 volt generator. you could buy a large battery charger and try it in use. if its not good enough return to store. my 200 amp boost says it supplies 60 amps at 12 |
AC to DC Converter
wrote:
Yes, get some batteries. Store them charged. -- 38 days until the winter solstice celebration Mark Lloyd http://notstupid.laughingsquid.com batteries large enough limit it to lead acid, which have a finite life with declining poer over time, shouldnt be stored discharged and they go dead just sitting around and after such discharge dont recover their previous capacity...... probably better off with a 12 volt generator. you could buy a large battery charger and try it in use. if its not good enough return to store. my 200 amp boost says it supplies 60 amps at 12 Someone had the best idea. Just jump from your car battery if necessary. |
AC to DC Converter
wrote:
Yes, get some batteries. Store them charged. -- 38 days until the winter solstice celebration Mark Lloyd http://notstupid.laughingsquid.com batteries large enough limit it to lead acid, which have a finite life with declining poer over time, shouldnt be stored discharged and they go dead just sitting around and after such discharge dont recover their previous capacity...... probably better off with a 12 volt generator. Generators can also deteriorate if not run regularly, and cost more than batteries. you could buy a large battery charger and try it in use. if its not good enough return to store. my 200 amp boost says it supplies 60 amps at 12 -- The e-mail address in our reply-to line is reversed in an attempt to minimize spam. Our true address is of the form . |
AC to DC Converter
Rich256 wrote:
wrote: Yes, get some batteries. Store them charged. -- 38 days until the winter solstice celebration Mark Lloyd http://notstupid.laughingsquid.com batteries large enough limit it to lead acid, which have a finite life with declining poer over time, shouldnt be stored discharged and they go dead just sitting around and after such discharge dont recover their previous capacity...... probably better off with a 12 volt generator. you could buy a large battery charger and try it in use. if its not good enough return to store. my 200 amp boost says it supplies 60 amps at 12 Someone had the best idea. Just jump from your car battery if necessary. That can also have a couple of downsides, though -- if you're not careful, you can discharge your car battery and strand yourself it's not always possible to move a car into a suitable position to use it that way Maybe one could use the BOAT's battery (if it has one)? -- The e-mail address in our reply-to line is reversed in an attempt to minimize spam. Our true address is of the form . |
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