free energy phone case - Page 1
Forum section: electronics / general

author: grifftech
author_rank: Frequent Contributor
timestamp: October 17, 2016, 07:21:07 pm
content: I want to make a phone case that uses the waste heat from the phone to charge the phone battery. Do you think this would work?

author: suku
author_rank: Contributor
timestamp: October 17, 2016, 07:28:51 pm
content: no, it will not. it's not really worth explaining why, it just simply cannot work... it's kinda like eating your own poop

author: madires
author_rank: Super Contributor
timestamp: October 17, 2016, 07:36:58 pm
content: It wouldn't work, but it's a great idea for a Kickstarter or Indigogo campaign. Much better than Batteroo or Solar Roadways

author: Gyro
author_rank: Super Contributor
timestamp: October 17, 2016, 07:37:56 pm
content: QuoteWorks for Rabbits(well 50% of the time anyway).

author: ataradov
author_rank: Super Contributor
timestamp: October 17, 2016, 08:08:10 pm
content: Quote from: madires on October 17, 2016, 07:36:58 pmI came here fully expecting to see a KS or IGG campaign.

author: grifftech
author_rank: Frequent Contributor
timestamp: October 18, 2016, 01:57:35 am
content: I know it will not run the phone forever, just longer

author: ataradov
author_rank: Super Contributor
timestamp: October 18, 2016, 02:00:25 am
content: Quote from: grifftech on October 18, 2016, 01:57:35 amThe question is how much longer. Is 0.1 second long enough?There is absolutely no way it could be economical. $2 USB battery will probably cover years of collecting energy from the heat.

author: Delta
author_rank: Super Contributor
timestamp: October 18, 2016, 02:33:13 am
content: That is a brilliant idea! All that heat is normally wasted anyway! Why not also design a phone that runs extra hot, then your case could produce even more free energy!

author: Mr.B
author_rank: Unknown
timestamp: October 18, 2016, 02:37:37 am
content: Give Scott Brusaw a call.He will be able to coach you on how to run a Kickstarter successfully.If you are lucky he may even let you in on the secrets behind how to get the city of Sandpoint to back your idea as well.

author: jonovid
author_rank: Super Contributor
timestamp: October 18, 2016, 02:37:56 am
content: Quoteno! in IMO.unless its aSuper HotSamsung ,but you can Try aShake-to-Chargecircuit to charge the phone batteryAll them Joggers with phones,then add Solar charging for good measure.https://www.eevblog.com/forum/chat/my-oddball-concepts-for-the-bored-electronics-engineer/if you do use shake-to-charge pendulum cells, have more then one, set at different Hz and set at different angles.jogging , running , walking esc.

author: jmctech
author_rank: Contributor
timestamp: October 18, 2016, 02:50:17 am
content: It might work great, it would just have to be specifically for the Note 7Sent from my SAMSUNG-SM-N920A using Tapatalk

author: Red Squirrel
author_rank: Super Contributor
timestamp: October 19, 2016, 12:44:43 am
content: Using waste heat from electrical stuff to produce energy is something that has crossed my mind, since the heat generated from electricity is technically 100% efficient, so even if you only get 10% efficiency out of the heat->electricity it's still something. But I don't think it would be viable in a small scale setup like a phone.I'm curious though, anyone know if this has been done in large scale? Like say using waste heat from factory motors to boil water and then spin a turbine and use that power for something else in the factory. I imagine that it's not worth the effort though?That said, you will never get more power out of it than you put into it, so you'd never be able to charge a battery this way. You are better off designing a case that has a few solar cells on the back and when you place it face down it would pulse charge. I say pulse charge, because solar cells of that size would not really be enough to actually continuously charge, but it could perhaps fill a small capacitor bank to 5v, then release that energy into the charge port. Question is, would it be enough to keep up with the idle discharge rate of the phone, let alone charge it in a semi reasonable time. Ex: give it 10% charge in an hour. It would also require placing your phone in direct sun light.Maybe a solar power bank would be a better idea, that way you can design it so it's bigger than a phone and has some kind of retractable/foldable solar panel that also acts as a shade for the whole unit and maybe even a place to put your phone under it.That said, if you use a Note 7, you should be able to use it to boil water and spin a small steam turbine and generate enough power to make another Note 7 explode.Speaking of solar, this is a more realistic size if you want some usable solar for charging stuff:This will charge phone at a normal rate (ex: if it was plugged in the wall) while charging other stuff like drone battery etc. It's not exactly portable like a phone case or power bank though.

author: Red Squirrel
author_rank: Super Contributor
timestamp: October 19, 2016, 12:54:26 am
content: Quote from: jonovid on October 18, 2016, 02:37:56 amMaybe you're on to something, maybe sweat could be used as an electrolyte that just keeps cycling through some metal plates to produce electricity.

author: daqq
author_rank: Super Contributor
timestamp: October 19, 2016, 01:25:05 pm
content: Can such a thing work? Yes.Can it do anything useful (prolong the life of a battery by any considerable amount)? Nope.

author: StuUK
author_rank: Frequent Contributor
timestamp: October 19, 2016, 02:00:36 pm
content: I hope Bob Roohparvar isn't reading this or you're just seeding him with his next BS venture...

author: Cyberdragon
author_rank: Super Contributor
timestamp: October 20, 2016, 05:23:21 am
content: 112 posts on this forum and doesn't know basic thermodynamics? Someone must have been posting under the radar, or he is trolling.

author: jonovid
author_rank: Super Contributor
timestamp: October 20, 2016, 05:48:32 am
content: heres one

author: grifftech
author_rank: Frequent Contributor
timestamp: October 20, 2016, 03:14:32 pm
content: Quote from: ataradov on October 18, 2016, 02:00:25 amyikes that is cheap and you need to charge that

author: ataradov
author_rank: Super Contributor
timestamp: October 20, 2016, 03:54:58 pm
content: Quote from: grifftech on October 20, 2016, 03:14:32 pmThey do work, even if they are cheap. If you don't like cheap, get a $10 brand name one.The point is, one change of this battery will provide more energy then lifetime of your thermal collection device.