Hello fellow overunity members! I have proposed a conundrum for you guys. First of all, I am a new member, I am twelve years old, and I love designing circuits. I have created this device that my family actually likes to use during power outages. It is no longer than the length of an ice tray, and no thicker than the depth of a loaf of bread. I believe it weighs somewhere around five pounds. I guess I am pretty proud of it. It works as a portable 120v AC 90W peak generator, I think it is around 15Wh (I might have calculated wrong). It can run a 60W CRT TV for about 15 minutes, and obviously a 15W appliance for one hour, which means a 20 watt relatively big LCD TV that I have for somewhere around 40 minutes, and so forth. But what it runs on is: drumroll please! ... Four nine volt batteries! It can also be charged up via the wall. I still wonder why I can't find very many people at all that have done anything similar. The circuit consists of, basically a 14.4V drill battery, an 150W inverter, and the drill battery is charged by four nine volt batteries wired like this: two groups of two nine volt batteries wired in series, to double voltage, and the two groups wired together in parallel, to double amperage. It goes through a three-amp blocking diode that gets hot to the touch when the batteries are in use. I cant imagine this thing needing more than a three amp diode. Basically it works by keeping the drill battery topped off, or even charged completely. You can use the batteries while under no load or under one. The batteries seem to be so powerful that when I was charging the drill battery under the 60W CRT TV load, it actually had overcome running the TV and started charging the battery while under the load! Under a 60W load, half an amp. Keep in mind guys this pretty non-efficient TV was running for fifteen minutes on four nine volt batteries! This circuit probably draws at least one amp from those batteries. Anyway, I'm going to stop babbling on and ask: what do you guys think?
Hi MU4L and welcome to the forum
I think it's hard to believe you're 12 years old and have been able to put together and describe such a circuit!... congratulation if this is true.
Can you tell us what inspired you to build this circuit? and post the schematic or link to it.
Thanks for sharing your work
Luc
As they say... "Screenshot (or video) or it didn't happen....."
;)
Seriously, welcome and it sounds pretty neat. You should make a video to demonstrate your device.
Back of the napkin: 4x9V alkaline batteries = 2240mAh * 8V average ~= 18Wh. 15Wh out is 83% efficient. It's OK but not earth shaking. For a 12 year old it is pretty darn good.
hmm... alkaline 9V batteries 560mAh ? maybe, but rechargable NiMh are only 200mAh rated
Quote from: forest on May 21, 2014, 02:28:13 AM
hmm... alkaline 9V batteries 560mAh ? maybe, but rechargable NiMh are only 200mAh rated
@ .05C they rate 600mAh. The data sheet is below.
Thanks everyone for reading and taking the time to reply! ;D
Well I never thought is was a very sophisticated circuit.
One thing I forgot to mention was that I have a few little features crammed in to the circuit, I will show them in a video or something.
Uh, actually I will be sure to post a video soon going over the circuit, and showing it power a few appliances. I'm also going to add two solar panels to slowly charge the battery.
What do you guys want it to run (I've spent around $40 on 3 boxes [36 batteries]
of Duracell Procell nine volt batteries [there are twelve in each box])?
Anyway guys I really appreciate it (some of you guys don't believe me ;)).
Also Luc, what inspired me to make it.. Well, when I was younger and didn't actually know how to design circuits, I would take whatever junk stopped working and go outside and throw it as hard as I could with my weak six or seven year old arms on the concrete until it broke open and I was able to grab some circuitry out of it. I would go inside and tape it to another circuit with some duct tape and pretend like I knew what I was doing. But I always wanted to run AC appliances without actually plugging them into the wall, instead just have a little box I could take around with me. I always felt like I was limited to what I could do from having a cord that only would be a few feet long. Anyway, gradually I learned. I think the first thing I learned to wire was a motor, because I remember it didn't matter what way I put the wires on the contacts, it worked either way. I also slowly learned the way to wire some components like resistors, switches, stuff like that. Another thing Luc, I will try and make a basic schematic and post it or just show it in the video. TinselKoala: like I said before, I will post a video and thanks a lot for your thoughts!
Lastly, Mark - thanks for calculating the efficiency and for the kind words! Also, thanks Luc! Thanks Forest! Jeez, I keep saying one more thing and another thing like Steve Jobs ;D, but I swear this is the last thing: if any of you guys go ahead and replicate this circuit, please let me know any additions you add to it, how it goes, and so forth. Or even post a video. Once again, THANKS! :)
Hi MU4L,
I'm waiting to see the circuit diagram and share your video clips.
Thanks.
PS: With cases like my own twelve years old of age you just said above: Yes, an electrical device that is working well in my hand it becomes debris and become garbage! . . I can not assemble it back to its original. ;D
;D Haha Havuhung, I don't even know if it had to be non-operational for me to destroy it, maybe just not in use.. But I'm sure I've destroyed a few things that were still in use. ;D
@ MU4L
Please post the wiring diagram (schematic) now. Draw it by hand will be fine.
We can watch your video later on when you have time to post it.
Thanks.
Alright, I'll try.
Basic schematic:
I didn't put the POT value because I forgot; just use the highest value you can find. It is for the low power function.
Ouch! As you can see by now, images that are over 1024 pixels wide cause some minor problems for displaying in the thread. Could you please resize that to a smaller horizontal pixel count? If you wait too long the opportunity to edit your post will pass and we'll be stuck with a super-wide page.
ETA: Here, I fixed the image for you. Please remove that big one so the page will not be so wide!
Haha, I realized that. I'm a newbie so.. How do you delete it? ???
At the top right of your post.... waaaay over to the right! You will see a "modify" button. Press that to get to the edit window, then at the bottom of that window you'll see a checkbox you can uncheck to remove that image.
No worries, we all have made the same mistake once or twice.
;)
To delete it:
1. Log in.
2. Click on Modify (just above your post & at the Far Right).
3. Remove the check mark for your wiring diagram.
4. Click on Save.
Thanks for sharing your circuit.
.
Thanks guys, I deleted it.
So are any of you guys going to replicate the circuit? Also, I forgot to say that my drill battery is pretty powerful - I believe it is three amps. That's actually probably why the diode was getting hot.