Instructables

Running an AC device from a battery

Hello,

I came across this forum in a google search for the subject matter and read some pretty good responses to a similar question, so I wondered if anyone could fill me in on whether it's possible to run a device such as this http://uk.store.creative.com/speakers/gigaworks-t20-series-ii/4-18020.aspx from a battery of some kind?

Thanks in advance for any information

mcamello8 months ago

Can a dynamo be used to recharge an EV battery?

If so, how about installing a dynamo on the EV with a connection to the wheel, or create a separate wheel for that purpose, of the car to produce electricity to recharge its battery. Along with the dynamo, have 2 storage batteries installed in the vehicle for use alternatively.

In the mean time, the fully charged battery shall run the car while the idle battery will be recharged automatically through the dynamo each time the car is being driven. When the “serving” battery runs low of power, the fully recharged battery shall then be pressed into service to run the car while the used battery shall be recharged with the same dynamo for ready use again.

Is the above suggestion feasible? If it is, then we can greatly reduce gasoline consumption globally and in the U.S. by installing this recommended device. Many countries in Europe will no longer be dependent on Russian oil supply. It will likewise minimize world air pollution.

Joshuakingdom (author) 1 year ago
Thanks a lot for all the info guys! I lost focus with this over the holidays as there was a lot more to it than I unrealistically hoped!. I need to learn some basic electronic skills before doing this to give myself a better chance of not wasting valuable stuff, I'll be sure to contact you again when I've got a clue about what I'm doing! thanks again
samaddon1 year ago
Good question ,
Do you know these speakers run on only 12 to 18 volts dc all you need to know to do this is some part of electronics . These speakers (or woofers whatever they are!) run on 12 to 18 volts dc you will see the power plug coming out of it which is it's power source when this 110 to 220 volts ac power is supplied there is a transformer in it it converts the high voltage to to low voltage upto 18 volts or something this is general voltage for all of these devices after the transformation this 18 or something volt is sent to a diode bridge for conversion to dc then the 18 volt dc it supplied to the main circuit . To run it from battery you need to open this and measure the voltage from the direct supply and just solder two wires across the diode bridge be very sure of the polarity and then if the voltage is over 12 volts just connect the 2 or more batteries until it reaches the measure of the main power supply for example if the voltage is 18 volts then take one 12 volts battery and a 6volts battery and connect them in series and join plus to plus and negative to negative terminals it will definately work if you have some problems you can catch me on a video call on skype or just mail me at samad@oniworld.in
samaddon1 year ago
Good question ,
Do you know these speakers run on only 12 to 18 volts dc all you need to know to do this is some part of electronics . These speakers (or woofers whatever they are!) run on 12 to 18 volts dc you will see the power plug coming out of it which is it's power source when this 110 to 220 volts ac power is supplied there is a transformer in it it converts the high voltage to to low voltage upto 18 volts or something this is general voltage for all of these devices after the transformation this 18 or something volt is sent to a diode bridge for conversion to dc then the 18 volt dc it supplied to the main circuit . To run it from battery you need to open this and measure the voltage from the direct supply and just solder two wires across the diode bridge be very sure of the polarity and then if the voltage is over 12 volts just connect the 2 or more batteries until it reaches the measure of the main power supply for example if the voltage is 18 volts then take one 12 volts battery and a 6volts battery and connect them in series and join plus to plus and negative to negative terminals it will definately work if you have some problems you can catch me on a video call on skype or just mail me at samad@oniworld.in
Orngrimm1 year ago
Normally such boxes first transform the AC-Voltage (110 volts or 230 Volts) to a lower level like around 12V AC.
Then they rectify it. And used will be DC.
Normal electronics always use DC... :)

So pry the boxes open and measure the DC-voltage used inside.
Now remove all the AC-Converting stuff and go directly with a propriate DC-Voltage to the point where the DC was generated.

Often such boxes also do the AC-DC-Conversion outside on a wall-Adapter... If so (Easyest way!!) you simply dump the wall-adapter and feed the box from your battery. On the Walladapter it is normally written what voltage comes out.
Joshuakingdom (author)  Orngrimm1 year ago
Thanks! okay so basically if it converts inside the box, then I need to know how to identify and remove then add components, as well as using a volt meter in the right places.

If it converts outside then all I have to do is cut loose the box then put an appropriate connector on the loose wire and connect it to a battery? and I would know the best battery type just by checking the box for voltage as you say?

I would only be capable of the easy way (hopefully) so I'll find out from the manufacturer where the conversion takes place. Please let me know if I've not understood properly, thanks again
Aye.
If i check my OLD speakers, they normally come with a wall-adapter with 6 or 9 (or rarely 12) volts DC.
If you find a 6V Speaker, thats just perfect, since you can use a lantern-battery which cost close to nothing. Do a google for "lantern battery" and see those quite big blocks from everedy, duracell or panasonic.

9V would be a little more tricky since the small 9V blocks just dont have the capacity needed for the job... You would have to wire up 2 smaller batteries (4.5V-Ones) to get the 9V.

See if you can find a speaker with an external walladapter (Also called wall-wart) for the conversion of AC to DC. Preferrably to 6V DC.
If you HAVE to have 9V, then repost again here in the thread and ill eyplain how to make 1x9V out of 2x4.5V