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Old 06-18-2013, 10:46 AM   #1
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From battery to AC power?


I've seen on internet some example of transforming power supply from battery to AC:
http://blog.makezine.com/2013/06/03/...-to-run-on-ac/

I run a device that works on a 12v 7ah SLA battery, would it be possible tu use it on AC power by connecting the device with a 12v 7a transformer, like this one:
http://www.ebay.com/itm/AC-to-DC-pow...item337539778e

Any idea?


Last edited by panchoskywalker; 06-18-2013 at 03:05 PM. Reason: Change title
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Old 06-18-2013, 01:40 PM   #2
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From battery to AC power?


That device takes AC wall power and makes DC voltage. It will not work in reverse to make DC voltage into AC voltage. For that you need an inverter.

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Old 06-18-2013, 02:20 PM   #3
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From battery to AC power?


Your thread title is wrong...."battery to AC Power"....what you really mean is AC to DC.

Ignore that first link....that is a hack looking for a person to hurt...

The second item looks like it will work. Just make sure you connect it correctly.

Now with that said...lets clear up a couple of points.....what is the actual amp draw of your device? What you posted was the capacity of the battery...basically, it will deliver 12 Vdc at 7 amps for one hour. If the device your powering with it lasts for longer than an hour, then your not pulling the full 7 amps...if it lasts less than an hour, the battery is either going bad or your amp draw is more than 7 amps.

If you are under 7 amps, then the above AC/DC device you referenced should work.
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Old 06-18-2013, 02:52 PM   #4
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From battery to AC power?


You might want to tell us what your device is.
There might be some good reasons why you don't want to do this.
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Old 06-18-2013, 03:07 PM   #5
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From battery to AC power?


Sorry, you're right, the title was wrong, I tried to change don't know if it'll work.

the device is photographic strobe that work on a power pack, it has a capacitor inside.
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Old 06-18-2013, 03:20 PM   #6
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From battery to AC power?


Under constant use, how much time do you get out of the battery?

The device should also tell you what the max current drain is?

I suspect that the charge on the cap may be more than the PS can handle....

I assume your looking for other options since the Li battery idea didn't pan out?
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Old 06-18-2013, 03:42 PM   #7
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From battery to AC power?


Quote:
Originally Posted by ddawg16 View Post
Under constant use, how much time do you get out of the battery?

The device should also tell you what the max current drain is?

I suspect that the charge on the cap may be more than the PS can handle....

I assume your looking for other options since the Li battery idea didn't pan out?
With a full battery charged, I can fire the strobe at his maximum power about 150 times, which means about 400 at minimum power, you don't measure the use in time but in fire/shots quantity.

Yes, the Li battery was an alternative but since it didn't pan out, I thought that maybe there was a way to connect the device to the "land network".
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Old 06-18-2013, 03:51 PM   #8
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From battery to AC power?


Have you tried calling the Mfg of the strobe and asking them if they have an AC adapter for it ?

Also, what is your location ? In the other thread you used a link to an Australian battery company.
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Old 06-18-2013, 04:04 PM   #9
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From battery to AC power?


Quote:
Originally Posted by Oso954 View Post
Have you tried calling the Mfg of the strobe and asking them if they have an AC adapter for it ?

Also, what is your location ? In the other thread you used a link to an Australian battery company.
The manufacturer doesn't make any adapter for it, the device is build to be used on location, already ask.
I'm located in Chile, the link you mention was just to show something.
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Old 06-18-2013, 04:48 PM   #10
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From battery to AC power?


Well, now we know that the ebay device will not work.
With Chile being 220V 50hz, it changes the problem a bit.
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Old 06-19-2013, 08:11 AM   #11
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From battery to AC power?


A 12 volt battery is actually about 13.5 volts when fully charged.
The device posted would likely work if it was the proper one for your local power grid.
How do you recharge the battery after using the flash? The charger device could likely be used to power the flash as well as charging the battery.
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Old 06-19-2013, 09:01 AM   #12
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From battery to AC power?


Quote:
Originally Posted by joed View Post
A 12 volt battery is actually about 13.5 volts when fully charged.
The device posted would likely work if it was the proper one for your local power grid.
How do you recharge the battery after using the flash? The charger device could likely be used to power the flash as well as charging the battery.
That is smart! Great idea! Thanks.

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