12V 3Amp monitor - can I use a 12V 4.5 Amp battery? Help please
I don't want to fry my security monitor, but I want to hook up a 12V
4.5A rechargeable battery to it. Since the monitor on the back says "12V 3amp", would the monitor fry or would it just take what it needs and be ok with this amperage? Thanks |
12V 3Amp monitor - can I use a 12V 4.5 Amp battery? Help please
David D wrote:
I don't want to fry my security monitor, but I want to hook up a 12V 4.5A rechargeable battery to it. Since the monitor on the back says "12V 3amp", would the monitor fry or would it just take what it needs and be ok with this amperage? Thanks In this case the question should be: "how long can I use the monitor before I have to recharge the battery?" -- |
12V 3Amp monitor - can I use a 12V 4.5 Amp battery? Help please
"Ryan Weihl" wrote in :
David D wrote: I don't want to fry my security monitor, but I want to hook up a 12V 4.5A rechargeable battery to it. Since the monitor on the back says "12V 3amp", would the monitor fry or would it just take what it needs and be ok with this amperage? Thanks In this case the question should be: "how long can I use the monitor before I have to recharge the battery?" A little over an hour.Maybe more if you are lucky. |
12V 3Amp monitor - can I use a 12V 4.5 Amp battery? Help please
David D wrote:
I don't want to fry my security monitor, but I want to hook up a 12V 4.5A rechargeable battery to it. Since the monitor on the back says "12V 3amp", would the monitor fry or would it just take what it needs and be ok with this amperage? Thanks Make sure the polarity (+ and -) are correct and you'll be fine. |
12V 3Amp monitor - can I use a 12V 4.5 Amp battery? Help please
beware, as the battery discharges, the voltage will drop. as that happens
the monitor will attempt to compensate for the loss of voltage and may ( may) cause internal power regulating components to overheat or fail. these things require a steady 12v level to attain good design performance (give or take a volt or two). if you are lucky it will just slowly dimm and become uselesss, then u know its time to recharge the batt, or it may just turn itself off due to voltages it will not accept, it depends on the manufacturer and just how much design thought they have invested in the monitor some may be very forgiving, some may give u poor performance as the battery volts drops. if it starts to smoke, you know what to expect. be very attentive during the first time you use the battery setup, smell, feel and even use a voltage meter DVM to track the voltage value of the battery power. "David D" wrote in message oups.com... I don't want to fry my security monitor, but I want to hook up a 12V 4.5A rechargeable battery to it. Since the monitor on the back says "12V 3amp", would the monitor fry or would it just take what it needs and be ok with this amperage? Thanks |
12V 3Amp monitor - can I use a 12V 4.5 Amp battery? Help please
Ï/Ç David D Ýãñáøå: I don't want to fry my security monitor, but I want to hook up a 12V 4.5A rechargeable battery to it. Since the monitor on the back says "12V 3amp", would the monitor fry or would it just take what it needs and be ok with this amperage? Thanks I 'm from greece and i don't know so much english. Yes you can use this battery the problem is in Volts. If you have a batterry with up of 12V don't try to use it with this monitor because you burn this monitor. The 4.5 Amperes of battery say how much current you can use from battery and if you have a monitor with up of 4.5A and conected with this battery you burn the battery and maybe this can make the battery to BOOOOOOOOM. You Understand? |
12V 3Amp monitor - can I use a 12V 4.5 Amp battery? Help please
On Apr 27, 2:54 am, wrote:
Ï/Ç David D Ýãñáøå: I don't want to fry my security monitor, but I want to hook up a 12V 4.5A rechargeable battery to it. Since the monitor on the back says "12V 3amp", would the monitor fry or would it just take what it needs and be ok with this amperage? Thanks I 'm from greece and i don't know so much english. Yes you can use this battery the problem is in Volts. If you have a batterry with up of 12V don't try to use it with this monitor because you burn this monitor. The 4.5 Amperes of battery say how much current you can use from battery and if you have a monitor with up of 4.5A and conected with this battery you burn the battery and maybe this can make the battery to BOOOOOOOOM. You Understand? 'thanks for the replies. Right now, I am interested in getting 12V battery with a 4.5 amperage. The only problem is I am doing it DIY and trying to make it on the cheap - therefore I am stuck with finding a way to RECHARGE the battery. Of course without LED lights and levels, I won't know know if it is charged or not. And yes, I don't want to blow a $100.00 monitor either. My main purpose for this is to create a portable monitor system. I went to Canadian Tire to find the 12V cordless drill batteries, but they only pump out 1.5 Amp, so it is getting harder then I thought... |
12V 3Amp monitor - can I use a 12V 4.5 Amp battery? Help please
"David D" wrote in message
ups.com... On Apr 27, 2:54 am, wrote: Ï/Ç David D Ýãñáøå: I don't want to fry my security monitor, but I want to hook up a 12V 4.5A rechargeable battery to it. Since the monitor on the back says "12V 3amp", would the monitor fry or would it just take what it needs and be ok with this amperage? Thanks I 'm from greece and i don't know so much english. Yes you can use this battery the problem is in Volts. If you have a batterry with up of 12V don't try to use it with this monitor because you burn this monitor. The 4.5 Amperes of battery say how much current you can use from battery and if you have a monitor with up of 4.5A and conected with this battery you burn the battery and maybe this can make the battery to BOOOOOOOOM. You Understand? 'thanks for the replies. Right now, I am interested in getting 12V battery with a 4.5 amperage. The only problem is I am doing it DIY and trying to make it on the cheap - therefore I am stuck with finding a way to RECHARGE the battery. Of course without LED lights and levels, I won't know know if it is charged or not. And yes, I don't want to blow a $100.00 monitor either. My main purpose for this is to create a portable monitor system. I went to Canadian Tire to find the 12V cordless drill batteries, but they only pump out 1.5 Amp, so it is getting harder then I thought... Well, now we're getting to the root of the problem. The answers that other posters have given are correct, for the most part. The issue now is.. how long do you need to operate the monitor on battery? The ampere-hour (AH) rating of a battery is useful in determining how long the battery can supply power. The load current is a major factor in determining this time. The chemistry of the battery is also a major factor in this calculation. A fairly good tutorial on batteries, AH ratings, Loads and recharging is at http://homepages.which.net/~paul.hil...eriesBody.html. I suggest that you read that with great attention and you will get a better understanding of your situation. For your portable application, I suggest that you look primarily at sealed lead-acid (SLA) batteries to start. Newer chemistries such as Lithium-Ion and others typically used in laptop computers have a higher energy/weight ratio, but are significantly more expensive. -- Dave M MasonDG44 at comcast dot net (Just substitute the appropriate characters in the address) Life is like a roll of toilet paper; the closer to the end, the faster it goes. |
12V 3Amp monitor - can I use a 12V 4.5 Amp battery? Help please
Yes, you are right. I am going to a local electronic store - bringing
the monitor with me - to see what they say. It would be nice to use the monitor for 3-4 hours at a time, longer would be a bonus. I will also ask about SLA batteries, thanks for that. On Apr 28, 11:15 am, "DaveM" wrote: "David D" wrote in message ups.com... On Apr 27, 2:54 am, wrote: Ï/Ç David D Ýãñáøå: I don't want to fry my security monitor, but I want to hook up a 12V 4.5A rechargeable battery to it. Since the monitor on the back says "12V 3amp", would the monitor fry or would it just take what it needs and be ok with this amperage? Thanks I 'm from greece and i don't know so much english. Yes you can use this battery the problem is in Volts. If you have a batterry with up of 12V don't try to use it with this monitor because you burn this monitor. The 4.5 Amperes of battery say how much current you can use from battery and if you have a monitor with up of 4.5A and conected with this battery you burn the battery and maybe this can make the battery to BOOOOOOOOM. You Understand? 'thanks for the replies. Right now, I am interested in getting 12V battery with a 4.5 amperage. The only problem is I am doing it DIY and trying to make it on the cheap - therefore I am stuck with finding a way to RECHARGE the battery. Of course without LED lights and levels, I won't know know if it is charged or not. And yes, I don't want to blow a $100.00 monitor either. My main purpose for this is to create a portable monitor system. I went to Canadian Tire to find the 12V cordless drill batteries, but they only pump out 1.5 Amp, so it is getting harder then I thought... Well, now we're getting to the root of the problem. The answers that other posters have given are correct, for the most part. The issue now is.. how long do you need to operate the monitor on battery? The ampere-hour (AH) rating of a battery is useful in determining how long the battery can supply power. The load current is a major factor in determining this time. The chemistry of the battery is also a major factor in this calculation. A fairly good tutorial on batteries, AH ratings, Loads and recharging is athttp://homepages.which.net/~paul.hills/Batteries/BatteriesBody.html. I suggest that you read that with great attention and you will get a better understanding of your situation. For your portable application, I suggest that you look primarily at sealed lead-acid (SLA) batteries to start. Newer chemistries such as Lithium-Ion and others typically used in laptop computers have a higher energy/weight ratio, but are significantly more expensive. -- Dave M MasonDG44 at comcast dot net (Just substitute the appropriate characters in the address) Life is like a roll of toilet paper; the closer to the end, the faster it goes. |
12V 3Amp monitor - can I use a 12V 4.5 Amp battery? Help please
"DaveM" wrote in message ... I went to Canadian Tire to find the 12V cordless drill batteries There's problem one. Don't go to Canadian Slime. |
12V 3Amp monitor - can I use a 12V 4.5 Amp battery? Help please
Ha, I do like their return policy though.
Ok, I found a battery - $24.00 - 12V 4.5amp so therefore I am going to only get 1.5 hours out of the monitor, right? Ok, I also picked up a female sleeve for a 12V lighter - but it is called "VDC 12V", is that the same? I guess I am going to have to spend more money to get a larger battery with more Amps, right? On Apr 28, 12:40 pm, "Homer J Simpson" wrote: "DaveM" wrote in message ... I went to Canadian Tire to find the 12V cordless drill batteries There's problem one. Don't go to Canadian Slime. |
12V 3Amp monitor - can I use a 12V 4.5 Amp battery? Help please
"David D" wrote in message
oups.com... Ha, I do like their return policy though. Ok, I found a battery - $24.00 - 12V 4.5amp so therefore I am going to only get 1.5 hours out of the monitor, right? Ok, I also picked up a female sleeve for a 12V lighter - but it is called "VDC 12V", is that the same? I guess I am going to have to spend more money to get a larger battery with more Amps, right? On Apr 28, 12:40 pm, "Homer J Simpson" wrote: "DaveM" wrote in message ... I went to Canadian Tire to find the 12V cordless drill batteries There's problem one. Don't go to Canadian Slime. Yep... that's what I'd suggest as a starter. You still need to do the math and figure just how long you need to operate the monitor from battery. It's the single most important piece of information you need to have. Next, use the charts on that web site that I posted for you to calculate the approximate run time for a given AH rating. Generally speaking, the higher the AH rating, the longer your monitor will run. Charging the battery is another question altogether. If you don't feel comfortable constructing your own charger (and from your previous questions, I gather that you don't), I suggest that you look for a charger that has normal charging with automatic switchover to float charging. Use Google.. search for SLA battery charger. -- Dave M MasonDG44 at comcast dot net (Just substitute the appropriate characters in the address) Life is like a roll of toilet paper; the closer to the end, the faster it goes. |
12V 3Amp monitor - can I use a 12V 4.5 Amp battery? Help please
On 28 Apr, 16:58, David D wrote:
Yes, you are right. I am going to a local electronic store - bringing the monitor with me - to see what they say. It would be nice to use the monitor for 3-4 hours at a time, longer would be a bonus. I will also ask about SLA batteries, thanks for that. On Apr 28, 11:15 am, "DaveM" wrote: "David D" wrote in message oups.com... On Apr 27, 2:54 am, wrote: Ï/Ç David D Ýãñáøå: I don't want to fry my security monitor, but I want to hook up a 12V 4.5A rechargeable battery to it. Since the monitor on the back says "12V 3amp", would the monitor fry or would it just take what it needs and be ok with this amperage? Thanks I 'm from greece and i don't know so much english. Yes you can use this battery the problem is in Volts. If you have a batterry with up of 12V don't try to use it with this monitor because you burn this monitor. The 4.5 Amperes of battery say how much current you can use from battery and if you have a monitor with up of 4.5A and conected with this battery you burn the battery and maybe this can make the battery to BOOOOOOOOM. You Understand? 'thanks for the replies. Right now, I am interested in getting 12V battery with a 4.5 amperage. The only problem is I am doing it DIY and trying to make it on the cheap - therefore I am stuck with finding a way to RECHARGE the battery. Of course without LED lights and levels, I won't know know if it is charged or not. And yes, I don't want to blow a $100.00 monitor either. My main purpose for this is to create a portable monitor system. I went to Canadian Tire to find the 12V cordless drill batteries, but they only pump out 1.5 Amp, so it is getting harder then I thought... Well, now we're getting to the root of the problem. The answers that other posters have given are correct, for the most part. The issue now is.. how long do you need to operate the monitor on battery? The ampere-hour (AH) rating of a battery is useful in determining how long the battery can supply power. The load current is a major factor in determining this time. The chemistry of the battery is also a major factor in this calculation. A fairly good tutorial on batteries, AH ratings, Loads and recharging is athttp://homepages.which.net/~paul.hills/Batteries/BatteriesBody.html. I suggest that you read that with great attention and you will get a better understanding of your situation. For your portable application, I suggest that you look primarily at sealed lead-acid (SLA) batteries to start. Newer chemistries such as Lithium-Ion and others typically used in laptop computers have a higher energy/weight ratio, but are significantly more expensive. There seem to be some misunderstandings here. Firstly there is no such a thing as a 4.5A battery, what you have is a 4.5Ah battery. This tells nothing about what current it will supply, but rather its capacity. 2nd, you wont get 1.5hrs from a 4.5Ah battery on 3A, for 2 reasons: a) Ah capacities are only correct for 20 hour discharge. High discharge rates will reduce capacity considerably. b) If you discharge a lead acid battery until flat it wont last long. You need to stay above 20% charge at least. For 4 hours of run time, if we momentarily ignore the 2 above issues: 4x3 = 12Ah Add 50% (guessed) for a short run time - 18Ah Add 25% to permit discharge down to 20%: 22.5Ah So really you want a 25Ah or more battery to do what you want. There is one last issue. Is the monitor 12 real volts or 12 battery volts? What are known as 12v batteries arent really 12v. This is fine if the monitor is designed to run off car supplies, but if it needs a 12v regulated supply it might be unfine - or it might be ok. Would be wisest to check first. NT |
12V 3Amp monitor - can I use a 12V 4.5 Amp battery? Help please
There seem to be some misunderstandings here. You are probably right, I don;t have the battery in front of me to check. Firstly there is no such a thing as a 4.5A battery, what you have is a 4.5Ah battery. This tells nothing about what current it will supply, but rather its capacity. 2nd, you wont get 1.5hrs from a 4.5Ah battery on 3A, for 2 reasons: a) Ah capacities are only correct for 20 hour discharge. High discharge rates will reduce capacity considerably. b) If you discharge a lead acid battery until flat it wont last long. You need to stay above 20% charge at least. For 4 hours of run time, if we momentarily ignore the 2 above issues: 4x3 = 12Ah Add 50% (guessed) for a short run time - 18Ah Add 25% to permit discharge down to 20%: 22.5Ah So really you want a 25Ah or more battery to do what you want. that is probably a good start. There is one last issue. Is the monitor 12 real volts or 12 battery volts? What are known as 12v batteries arent really 12v. This is fine if the monitor is designed to run off car supplies, but if it needs a 12v regulated supply it might be unfine - or it might be ok. Would be wisest to check first. NT How do I check? The monitor did not come with instructions and the specs I am detailing are from the back of the monitor, so I cannot really tell the voltage it needs. IS there a way to check this reliably? Thank you for the interest. |
12V 3Amp monitor - can I use a 12V 4.5 Amp battery? Help please
David D wrote:
Ha, I do like their return policy though. Ok, I found a battery - $24.00 - 12V 4.5amp so therefore I am going to only get 1.5 hours out of the monitor, right? Ok, I also picked up a female sleeve for a 12V lighter - but it is called "VDC 12V", is that the same? I guess I am going to have to spend more money to get a larger battery with more Amps, right? On Apr 28, 12:40 pm, "Homer J Simpson" wrote: "DaveM" wrote in message ... I went to Canadian Tire to find the 12V cordless drill batteries There's problem one. Don't go to Canadian Slime. I wish you people would get your terminology right. Nowhere do I see anybody talking about Ah (amphours/Battery capacity) A battery does not produce Amps, what you mean the battery produces 12V(DC) at 4.5Ah for 1 hour (amp hours). Thats 12V for 4.5 hours at 1Amp load. If the monitor needs 1.5A, the you take the 4.5 Ah from the battery and divide this by 1.5A load from the monitor and it will tell you how long the monitor will run. rw -- |
12V 3Amp monitor - can I use a 12V 4.5 Amp battery? Help please
On 29 Apr, 17:11, David D wrote:
There is one last issue. Is the monitor 12 real volts or 12 battery volts? What are known as 12v batteries arent really 12v. This is fine if the monitor is designed to run off car supplies, but if it needs a 12v regulated supply it might be unfine - or it might be ok. Would be wisest to check first. NT How do I check? The monitor did not come with instructions and the specs I am detailing are from the back of the monitor, so I cannot really tell the voltage it needs. IS there a way to check this reliably? Thank you for the interest. Simple way is to determine what it expects to run off, large wall wart, stabilised psu or battery. One giveaway would be a dotted equals sign, meaning rectified ac, which would mean it expects to see unregulated supply, hence a battery would be fine. ____ ..... (works in non-proportional font) However there's no guarantee that there will be anything on it to tell you one way or the other. NT |
12V 3Amp monitor - can I use a 12V 4.5 Amp battery? Help please
On 29 Apr, 20:00, "Ryan Weihl" wrote:
I wish you people would get your terminology right. Nowhere do I see anybody talking about Ah (amphours/Battery capacity) A battery does not produce Amps, what you mean the battery produces 12V(DC) at 4.5Ah for 1 hour (amp hours). Thats 12V for 4.5 hours at 1Amp load. If the monitor needs 1.5A, the you take the 4.5 Ah from the battery and divide this by 1.5A load from the monitor and it will tell you how long the monitor will run. rw No, this is a common mistake. My post explains why. NT |
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