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Inverter Size
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Hash: SHA1 On Wed, 31 Dec 2003 06:25:43 -0500, hanz wrote: FOR $55.00 UDS you can my a PW-70A which takes 12v dc and has all the output for you computer..look at: http://www.logicsupply.com/product_i...roducts_id/118 I've been running only for 4 months. Hanz That will work fine, provided your power requirements are 100W Jim Richardson wrote: -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 30 Dec 2003 10:32:28 -0800, Dan wrote: "Fred Miller" wrote in message ... Slightly Off topic but I know someone here can answer the question. I am trying to run a Dell Inspiron 5100 in my truck using a small inverter but all I do is blow fuses in the truck. This is a 6 month old Chev 1500 in excellent condition. My "brick" 110 V power supply reads: AC 100-240 V - 103-109 VA 50-60Hz DC 20 V 4.5 A What size inverter in watts do I need to use with this power supply? Can a cigar lighter outlet supply the required power? TIA for your help. Whether in a truck or a boat, it's inefficient to convert DC to AC back to DC. You'd be better off powering a tower or laptop computer directly from the DC off the vehicle. A trip to Radio Shack should provide all the parts needed. An AT power supply for a tower computer has +12V, -12V, +5V, -5V, and ground. For the +12V and -12V, you will need to filter and regulate the DC feed from your battery bank. The +5V and -5V can be derived from your filtered 12V side, just step the voltage down via a stepdown transformer and regulate it. Make sure to filter the ground as well or gremlins will get your electronics. Now take the wires from your existing PC power supply and connect them to your new power supply. This is overly simplified, but I think the whole project can be built from schematics found in the Radio Shack project books. Laptops are a little bit trickier. Find the voltage rating of the battery, then step the 12V DC of the vehicle to the proper voltage. The tricky part is determining if the voltage regulator is built into the battery or the laptop itself. You may have to make the voltage regulator yourself. If you don't need the regulator, connect your new power supply to the battery contact pads on the laptop. Just remember that you will definately void any warranty doing this. Dan Schiro M/V Sea Ranch Pensacola Sail and Power Squadron In order to use a transformer to step the voltage down, you must by definition be using AC. A transformer doesn't work with a DC level. Rather than go to the hassle of designing and building your own powersupplies, you can buy std AT style supplies that take 12VDC as an input, but usually in limited power forms, don't try powering your 500W game monster machine from one. Expect to pay $200 and up for one. For the laptop, most manufacturers make a 12V car powersupply as an option. If not, then Targus among others, will happily sell you one. The downside to low voltage DC of course, is the I2R losses in the cables, 120VAC may lose some in the translation from DC-AC, but it has the advantage of low loss with relatively small gauge wire. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.3 (GNU/Linux) iD8DBQE/8meQd90bcYOAWPYRAuUoAKCkpe7G1QMqI69rHIY/NDsUMufRMwCg35tZ uQMzGFjAHt6OJ/BpercEcYM= =jt/b -----END PGP SIGNATURE----- -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.3 (GNU/Linux) iD8DBQE/8y7+d90bcYOAWPYRAqSDAJ9JDBhAt/1MvskrvEcIZeAmDVCv1wCfdPAW isMKA9pMKSVoob5g2swpdSE= =Sf7n -----END PGP SIGNATURE----- -- Jim Richardson http://www.eskimo.com/~warlock We aim to please. Ourselves, mostly, but we do aim to please. Anthony DeBoer |
Inverter Size
Jim Richardson wrote in message ...
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 30 Dec 2003 10:32:28 -0800, Dan wrote: "Fred Miller" wrote in message ... Slightly Off topic but I know someone here can answer the question. I am trying to run a Dell Inspiron 5100 in my truck using a small inverter but all I do is blow fuses in the truck. This is a 6 month old Chev 1500 in excellent condition. My "brick" 110 V power supply reads: AC 100-240 V - 103-109 VA 50-60Hz DC 20 V 4.5 A What size inverter in watts do I need to use with this power supply? Can a cigar lighter outlet supply the required power? TIA for your help. Whether in a truck or a boat, it's inefficient to convert DC to AC back to DC. You'd be better off powering a tower or laptop computer directly from the DC off the vehicle. A trip to Radio Shack should provide all the parts needed. An AT power supply for a tower computer has +12V, -12V, +5V, -5V, and ground. For the +12V and -12V, you will need to filter and regulate the DC feed from your battery bank. The +5V and -5V can be derived from your filtered 12V side, just step the voltage down via a stepdown transformer and regulate it. Make sure to filter the ground as well or gremlins will get your electronics. Now take the wires from your existing PC power supply and connect them to your new power supply. This is overly simplified, but I think the whole project can be built from schematics found in the Radio Shack project books. Laptops are a little bit trickier. Find the voltage rating of the battery, then step the 12V DC of the vehicle to the proper voltage. The tricky part is determining if the voltage regulator is built into the battery or the laptop itself. You may have to make the voltage regulator yourself. If you don't need the regulator, connect your new power supply to the battery contact pads on the laptop. Just remember that you will definately void any warranty doing this. Dan Schiro M/V Sea Ranch Pensacola Sail and Power Squadron In order to use a transformer to step the voltage down, you must by definition be using AC. A transformer doesn't work with a DC level. Rather than go to the hassle of designing and building your own powersupplies, you can buy std AT style supplies that take 12VDC as an input, but usually in limited power forms, don't try powering your 500W game monster machine from one. Expect to pay $200 and up for one. For the laptop, most manufacturers make a 12V car powersupply as an option. If not, then Targus among others, will happily sell you one. The downside to low voltage DC of course, is the I2R losses in the cables, 120VAC may lose some in the translation from DC-AC, but it has the advantage of low loss with relatively small gauge wire. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.3 (GNU/Linux) iD8DBQE/8meQd90bcYOAWPYRAuUoAKCkpe7G1QMqI69rHIY/NDsUMufRMwCg35tZ uQMzGFjAHt6OJ/BpercEcYM= =jt/b -----END PGP SIGNATURE----- Jim, Good catch about the transformers. A simple analog voltage divider would work. |
Inverter Size
Jim Richardson wrote in message ...
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 30 Dec 2003 10:32:28 -0800, Dan wrote: "Fred Miller" wrote in message ... Slightly Off topic but I know someone here can answer the question. I am trying to run a Dell Inspiron 5100 in my truck using a small inverter but all I do is blow fuses in the truck. This is a 6 month old Chev 1500 in excellent condition. My "brick" 110 V power supply reads: AC 100-240 V - 103-109 VA 50-60Hz DC 20 V 4.5 A What size inverter in watts do I need to use with this power supply? Can a cigar lighter outlet supply the required power? TIA for your help. Whether in a truck or a boat, it's inefficient to convert DC to AC back to DC. You'd be better off powering a tower or laptop computer directly from the DC off the vehicle. A trip to Radio Shack should provide all the parts needed. An AT power supply for a tower computer has +12V, -12V, +5V, -5V, and ground. For the +12V and -12V, you will need to filter and regulate the DC feed from your battery bank. The +5V and -5V can be derived from your filtered 12V side, just step the voltage down via a stepdown transformer and regulate it. Make sure to filter the ground as well or gremlins will get your electronics. Now take the wires from your existing PC power supply and connect them to your new power supply. This is overly simplified, but I think the whole project can be built from schematics found in the Radio Shack project books. Laptops are a little bit trickier. Find the voltage rating of the battery, then step the 12V DC of the vehicle to the proper voltage. The tricky part is determining if the voltage regulator is built into the battery or the laptop itself. You may have to make the voltage regulator yourself. If you don't need the regulator, connect your new power supply to the battery contact pads on the laptop. Just remember that you will definately void any warranty doing this. Dan Schiro M/V Sea Ranch Pensacola Sail and Power Squadron In order to use a transformer to step the voltage down, you must by definition be using AC. A transformer doesn't work with a DC level. Rather than go to the hassle of designing and building your own powersupplies, you can buy std AT style supplies that take 12VDC as an input, but usually in limited power forms, don't try powering your 500W game monster machine from one. Expect to pay $200 and up for one. For the laptop, most manufacturers make a 12V car powersupply as an option. If not, then Targus among others, will happily sell you one. The downside to low voltage DC of course, is the I2R losses in the cables, 120VAC may lose some in the translation from DC-AC, but it has the advantage of low loss with relatively small gauge wire. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.3 (GNU/Linux) iD8DBQE/8meQd90bcYOAWPYRAuUoAKCkpe7G1QMqI69rHIY/NDsUMufRMwCg35tZ uQMzGFjAHt6OJ/BpercEcYM= =jt/b -----END PGP SIGNATURE----- Jim, Good catch about the transformers. A simple analog voltage divider would work. |
Inverter Size
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Inverter Size
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Inverter Size
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Hash: SHA1 On 31 Dec 2003 17:37:47 -0800, Dan wrote: Jim Richardson wrote in message snip In order to use a transformer to step the voltage down, you must by definition be using AC. A transformer doesn't work with a DC level. Rather than go to the hassle of designing and building your own powersupplies, you can buy std AT style supplies that take 12VDC as an input, but usually in limited power forms, don't try powering your 500W game monster machine from one. Expect to pay $200 and up for one. For the laptop, most manufacturers make a 12V car powersupply as an option. If not, then Targus among others, will happily sell you one. The downside to low voltage DC of course, is the I2R losses in the cables, 120VAC may lose some in the translation from DC-AC, but it has the advantage of low loss with relatively small gauge wire. Jim, Good catch about the transformers. A simple analog voltage divider would work. The down side to simple voltage devider, is that you have to throw away a lot of power, whether you are doing it with a linear regulator, a dropping resistor, or a zener diode, any voltage you don't "use" get's wasted as heat at the rate of "unwanted volts" X amp draw. Nasty if you are powering a high draw system like a 5VDC logic board, with 12VDC. In the case of a computer, your best choice really is either an inverter, or a DC-DC switching powersupply built for the task. Either, well done, is going to draw less total power, (by wasting less) than a linear regulator or voltage divider setup. Unfortunately, they are going to have other problems which have to be dealt with, most importantly, being switching noise. Which is pretty critical in the case of a system on a boat with comm gear. You'll need to take the relevent precautions to prevent noise coming in the power supply of the radios. On the other hand, if you have the space and inclination, you could allways build a motor-generator converter :) although they are typically used in situations where you are changing a *lot* of power, and number of phases and frequencies too.. but you could do it I suppose :) -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.3 (GNU/Linux) iD8DBQE/9M88d90bcYOAWPYRAiMUAKCF/TUfonjiqRlgaHzuYlPvu2G0dgCeJI3p l7AchR0x3QgLW08NoMPniAw= =qVQ+ -----END PGP SIGNATURE----- -- Jim Richardson http://www.eskimo.com/~warlock "Even if you can deceive people about a product through misleading statements, sooner or later the product will speak for itself." - Hajime Karatsu |
Inverter Size
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1 On 31 Dec 2003 17:37:47 -0800, Dan wrote: Jim Richardson wrote in message snip In order to use a transformer to step the voltage down, you must by definition be using AC. A transformer doesn't work with a DC level. Rather than go to the hassle of designing and building your own powersupplies, you can buy std AT style supplies that take 12VDC as an input, but usually in limited power forms, don't try powering your 500W game monster machine from one. Expect to pay $200 and up for one. For the laptop, most manufacturers make a 12V car powersupply as an option. If not, then Targus among others, will happily sell you one. The downside to low voltage DC of course, is the I2R losses in the cables, 120VAC may lose some in the translation from DC-AC, but it has the advantage of low loss with relatively small gauge wire. Jim, Good catch about the transformers. A simple analog voltage divider would work. The down side to simple voltage devider, is that you have to throw away a lot of power, whether you are doing it with a linear regulator, a dropping resistor, or a zener diode, any voltage you don't "use" get's wasted as heat at the rate of "unwanted volts" X amp draw. Nasty if you are powering a high draw system like a 5VDC logic board, with 12VDC. In the case of a computer, your best choice really is either an inverter, or a DC-DC switching powersupply built for the task. Either, well done, is going to draw less total power, (by wasting less) than a linear regulator or voltage divider setup. Unfortunately, they are going to have other problems which have to be dealt with, most importantly, being switching noise. Which is pretty critical in the case of a system on a boat with comm gear. You'll need to take the relevent precautions to prevent noise coming in the power supply of the radios. On the other hand, if you have the space and inclination, you could allways build a motor-generator converter :) although they are typically used in situations where you are changing a *lot* of power, and number of phases and frequencies too.. but you could do it I suppose :) -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.3 (GNU/Linux) iD8DBQE/9M88d90bcYOAWPYRAiMUAKCF/TUfonjiqRlgaHzuYlPvu2G0dgCeJI3p l7AchR0x3QgLW08NoMPniAw= =qVQ+ -----END PGP SIGNATURE----- -- Jim Richardson http://www.eskimo.com/~warlock "Even if you can deceive people about a product through misleading statements, sooner or later the product will speak for itself." - Hajime Karatsu |
Inverter Size
this might be what someone else was referring to
kit costs about $US32 http://user.gru.net/n4uau/kits/Volta...e/apvb-kit.htm which isnt as cheap as this which i just bought for $US17.90 http://www.compgeeks.com/additem.asp?invtid=SDR-70W On Fri, 26 Dec 2003 16:45:01 +0000, Fred Miller wrote: Slightly Off topic but I know someone here can answer the question. I am trying to run a Dell Inspiron 5100 in my truck using a small inverter but all I do is blow fuses in the truck. This is a 6 month old Chev 1500 in excellent condition. My "brick" 110 V power supply reads: AC 100-240 V - 103-109 VA 50-60Hz DC 20 V 4.5 A What size inverter in watts do I need to use with this power supply? Can a cigar lighter outlet supply the required power? TIA for your help. |
Inverter Size
this might be what someone else was referring to
kit costs about $US32 http://user.gru.net/n4uau/kits/Volta...e/apvb-kit.htm which isnt as cheap as this which i just bought for $US17.90 http://www.compgeeks.com/additem.asp?invtid=SDR-70W On Fri, 26 Dec 2003 16:45:01 +0000, Fred Miller wrote: Slightly Off topic but I know someone here can answer the question. I am trying to run a Dell Inspiron 5100 in my truck using a small inverter but all I do is blow fuses in the truck. This is a 6 month old Chev 1500 in excellent condition. My "brick" 110 V power supply reads: AC 100-240 V - 103-109 VA 50-60Hz DC 20 V 4.5 A What size inverter in watts do I need to use with this power supply? Can a cigar lighter outlet supply the required power? TIA for your help. |
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