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Old 03-16-2012, 07:26 PM   #1
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Best way to power this timer..


Hi,

I'm getting ready to wire up keypad door with this timer. I was wondering what would work in terms of powering the timer.

I was thinking just 1 or 2 12V batteries wired to the input (connections 1 and 2) on the timer.

Would this work, or not...is there something better?

I need it to be powered by batteries too, no plugs around.
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Old 03-16-2012, 07:37 PM   #2
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Best way to power this timer..


I don't think you will have very good luck running that with batteries unless you want to change them a lot. Fishing some wire to a 24v doorbell transformer would be a better option.

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Old 03-16-2012, 07:41 PM   #3
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Best way to power this timer..


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Originally Posted by freedom1st1776 View Post
Hi,

I'm getting ready to wire up keypad door with this timer. I was wondering what would work in terms of powering the timer.

I was thinking just 1 or 2 12V batteries wired to the input (connections 1 and 2) on the timer.

Would this work, or not...is there something better?

I need it to be powered by batteries too, no plugs around.
Agreed. That is designed to be powered by an adapter, or the power source from other equipment. Batteries may work as a backup, but no long term usage. What is your wiring for the door lock? What powers the lock?
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Old 03-16-2012, 08:01 PM   #4
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The lock is powered by 4 x aa batteries. It's not that heavy duty.

There was a timer model with a 12V input, would that have made a difference?
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Old 03-16-2012, 08:10 PM   #5
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The lock is powered by 4 x aa batteries. It's not that heavy duty.

There was a timer model with a 12V input, would that have made a difference?
So what's the purpose of the timer? Disable the keypad, operate the lock??
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Old 03-16-2012, 08:17 PM   #6
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Trying to do it with batteries of any kind is the problem. Even when not using the lock their will be current trickling out of them---just like if you leave your car sit for weeks with nothing electrical seeming to be running. I agree that you will be replacing batteries constantly and needing to cycle them through a charger.

Where is the nearest power? No way you can run a 24V line from a transformer at that point?

I am assuming this is for a storage shed or something? Do you really need an electronic keypad lock? Nothing against high tech but there is still a place for combination or key locks. Or mechanical keypad locks for that matter.
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Old 03-16-2012, 08:25 PM   #7
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So what's the purpose of the timer? Disable the keypad, operate the lock??
To only allow the keypad to work for a couple hours on the weekend. When the timer isn't on, a correct keypad entry would be useless.
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Old 03-16-2012, 08:29 PM   #8
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So you are just breaking the keypad circuit? No load on the terminals..right? Is there any information on the timer as to power consumption? I see what it requires as voltage, and I see a battery compartment which I will assume it just keeps the time. Will that timer be accessable and what if the batteries fail...are you locked out w/ no other recourse?
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Old 03-16-2012, 08:35 PM   #9
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So you are just breaking the keypad circuit? No load on the terminals..right? Is there any information on the timer as to power consumption? I see what it requires as voltage, and I see a battery compartment which I will assume it just keeps the time. Will that timer be accessable and what if the batteries fail...are you locked out w/ no other recourse?
Yes I am just breaking the keypad circuit.

Not sure about power consumption. The battery compartment is for emergency power too.

The keypad is to the outside of my backyard fence, I can simply come in from the front of the house if I needed to.

Would I be able to at least hook up a 12V battery to it and see how long that lasts?
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Old 03-16-2012, 08:37 PM   #10
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I would try it....nothing to lose. Where would you put the battery and how would you run the wire? If the battery is remotely placed couldn't you do that with a power supply as well? Got a mfg. and model number for that timer?
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Old 03-16-2012, 08:51 PM   #11
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Would I be able to at least hook up a 12V battery to it and see how long that lasts?
Need to change from the 24V to 12V switch of course.
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Old 03-16-2012, 09:06 PM   #12
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Need to change from the 24V to 12V switch of course.
So there's no way to power this 24V from batteries?
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Old 03-16-2012, 09:15 PM   #13
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I would try it....nothing to lose. Where would you put the battery and how would you run the wire? If the battery is remotely placed couldn't you do that with a power supply as well? Got a mfg. and model number for that timer?
Timer is:
TM-619-3

http://www.king-ielec.com.tw/all/spe...ts/tm/619.html


I was just going to mount a battery on the inside of the keypad box.
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Old 03-17-2012, 06:31 AM   #14
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So there's no way to power this 24V from batteries?
I thought you said you could exchange for a 12V option? Honestly, I did not look but I should think your battery options at 12v would be greater than at 24v and the pricing better too?

I searched a bit since I was curious and it looks like a scooter battery might be your best option. Only other option I found easily was a tool battery but you would have to get into the casing to wire it. Anyhow, looks like you are looking at $50 to $200 retail for a 24v battery. This what you had in mind? Are you underestimating the size of a 24V battery? Here is the site I explored:

http://www.monsterscooterparts.com/24vobapa.html

Hopefully someone else better at battery selection will chime in.

Sure the gate is so far away you cannot run low voltage wire from a transformer to it? Just a thought mentioned before. You can buy quite a bit of low voltage direct burial wire for the money you will spend on just one battery. Of course you have to watch your current loss over the wire run but you are just going to power the switch not landscape lighting or anything. A transformer at your power source will cost you chimp change compared to a charger and replacing batteries?

Do you think there is any sort of wireless solution that would work for this? It would mean carrying a keybob or something and I am guessing this is what you are trying to avoid.

Last edited by user1007; 03-17-2012 at 06:58 AM.
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Old 03-17-2012, 08:25 AM   #15
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Not sure if my math is at all right but specs say 7va current draw. A typical car battery 600 amps capacity (surge, constant is likely much less). So, I'm thinking 600/7 is about 8 hours and that's likely an over estimation. That sound right?

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