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Candles with external power supply Answered

Hello everybody, hope somebody will be able to help me out or point to a right direction.

I have about 40 battery candles that I have to change batteries every month. I was wondering what could I do to convert them to candles with power supply connected to a regular outlet so there wouldn't be a need for batteries.

I know there are special candles with external power supplies but the ones I found are in thousands of dollar. These candles go inside large candles made from wax that is a reason why I need long wires.

I have attached pictures of the candles. What I would like to do is to connect them with long wires to one or multiply power supplies connected to regular electrical power outlet.

One candle holds 4 AA batteries.

Could someone recommend what power supply and parts I should get to make this happen?


5 Replies

killerjackalope (author)2010-09-01

Try putting four rechargeable 1.2V AAs in. If they run then a phone charger will provide power for up to 190 candles with safety allowed for...

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wobbler (author)2010-09-01

Your batteries last a month, so that is telling you how much current the lights are using on average. The best AA's return about 3000mA hrs (I'm exagerrating slightly to get the maximum possible current). So, this means if your batteries last a month (approx 24*31 hours), they are taking 3000/(24*31) mA on average or 4mA. So, your 40 battery candles would need 4*40mA = 160mA maximum. They will sometimes take more than the average current and sometimes a lot less, but it should be more than ok to run them in parallel across a 6v 250mA power supply. You definitely wouldn't want them in series because, depending on the circuit, the off ones may not be taking any current so they would effectively block the rest in the chain from lighting.

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gointern (author)2010-08-27

For one candle I would need 6 volts and could use an adapter like Enercell 6V/800mA AC Adapter ( http://www.radioshack.com/product/index.jsp?productId=3839138# ) So to light 40 candles all at once I would need 60 volts power adapter (without the safety factor). Then I could just run a bunch of wires to all the candles. Am I correct?

The biggest one I found at radioshack so far is Enercell 13.5-30V/1000mA Power Adapter ( http://www.radioshack.com/product/index.jsp?productId=3875408 ) I am not an electrician so please bare with me. Would 3 of them be enough to power 40 candles. Not sure what mA would be needed.

The other one I found was 24V/1A ( http://www.radioshack.com/product/index.jsp?productId=3832489 ) Would 4 be enough?

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NachoMahma (author)2010-08-26

. A 6VDC wall wart will do the job. Connect the positive side of the wall wart's output to the red wires on top of the battery holder and the negative to the black wire. If you don't need the switch on the bottom of the battery holder, short the white wires together and you can get rid of it. . I'm not sure how much current you will need, but it shouldn't be very much for one LED and a flasher circuit.

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kelseymh (author)2010-08-26
This I'ble gives you the basics on adding power to an individual candle. For multiple candles, I'd probably go with jacks on each one, and a separate "hub" with wires hooked up in parallel to a wall wart.

NOTE: Make sure that you choose a wall wart with enough current capacity to drive all the candles simultaneously, plus at least a 25% safety factor. If you want to do a "professional looking" project, you probably want to include a fuse in the hub.

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