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/diy/ - Do It Yourself

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178831 No.178831 [Reply] [Original]

Need help /diy/
I'm interested in building a generator, specifically pedal powered. I have no experience with this kind of shit. Any tips on where to get started or do you have a guide?

>> No.178833
File: 374 KB, 2312x1288, Stationary Bike Generator Power Diagram 01.jpg [View same] [iqdb] [saucenao] [google]
178833

>>178831
The most difficult part is making sure you have a generator/alternator/motor that will output enough volts to just get over the voltage of your battery/battery array. If you have a 12v battery you want to charge then you need to output a STEADY 14.5v to 15v from your bike. Once you find a generator/alternator/motor that can do this for you, you'll need to find out the RPMs you need to pedal at to maintain this perfect speed. If your generator/alternator/motor runs too fast and outputs too many volts, you can use resistors to reduce it down to the level needed if you are maintaining a higher RPM on your bike. That way you can pedal and get either exercise or pedal at least fast enough to make pedaling worthwhile.

One good place to research is on instructables.com just do a few different searches for the same project. Read the comments too as they contain lots of good info.

>> No.179530

>>178833
>you'll need to find out the RPMs you need to pedal at to maintain this perfect speed.

Internally regulated automotive alternators will maintain a steady 14v even as the speed of the engine driving them varies from 800rpm to 8000. They usually have capacities somewhere in the neighborhood of 100 amps (although ones out of older cars with minimal electronics can be as low as 40a). It's common for the alternator's pulley on a car to give at least a 3:1 overdrive ratio, so if you want reliable power out of one you want to get it rigged up to spin somewhere between 2,500-2,5000 rpm - a pretty wide target band.

>> No.179602

>pedal powered
>automotive alternators

You guys fluked physics or what?

>> No.179603

>>179602

Yea I fluked physics. I fluked it so hard

>> No.180157

>>179602
Why? All you have to do is get it overdriven somewhere between 40:1 and 400:1 vs pedal speed, and that's not very hard. They're purpose-built to generate electricity at a wide range of RPM, and have little inertia or drag when there's no load on them (other than their tiny cooling fan). There's no risk of overloading them, as a human would be lucky to drive one at 25% capacity without totally grinding to a halt.

They are the cheapest and most common purpose-built small generators in the world. They are absolutely everywhere. You can easily salvage one from a junk car, or go to a major chain self-service junkyard and get one for $24. They are very compact and very efficient - automakers have poured tons of money into making sure the alternator isn't costing them an extra 0.1 mpg on their CAFE, so they can keep dodging the gas-guzzler tax.

It's a vastly more efficient option than trying to wind your own or converting a discarded motor.

>> No.180178
File: 40 KB, 370x530, Fluke 787 Process meter_l.jpg [View same] [iqdb] [saucenao] [google]
180178

>>179602
I constantly fluked during physics

>> No.180179

WHERE TO GET STARTED:

A highly trsianed elite athlete can put out 1/3 HP in short bursts. Yoi know what thta's oing to do? LIGHT ONE GODDAMNE DLIGHT BULB.

bicycle generatior: Don;t be a fucking moron. pedal for six fucking hourrs and charge one cell phone.

Jesys can any of you do basic math? BRAINS MOTHEFUSCKER FDO YOU HAVE THEM?

>> No.180216

>>180179
>pedal any amount of time, power a small tv while doing so thus gaining exercise whilst also being entertained
Are you mad bruh?

>> No.180219

>>180216

Yeah and for $19.95 you can be just like me!

No? YOUR LOSS. Good luck with your pocket TV and sweaty hooby instead of outside with birds and trees and hjoggers nad girls..

>> No.180222

>>180219
Good luck with your 300 lbs. still completely intact as you try to jog but have to stop every 30 seconds to jack off at the girl joggers that you know you can't have but your down syndrome can't process.

>> No.180225

>>180222

MAAAAn gotta wonder what's you're excuse.

In the morning I'll be sober but you'll sitll be MAFD and OOOGlay.

>> No.180226

>>180225
Umm, whatever you just said, you must be 12 thinking that misspelling everything is funny or something.

>> No.180228

>>180225
>pretending to be drunk on the internet
>intentionally misspelling words to appear more drunk

god, you sad sack of shit

>> No.180235

>>180228

nope, actually drunk as hell. My typing is no worse than usual, I just care less.

You got your hovbbies, I got mine.

>> No.180236

>>180228
lol
>Drunk.
>I guess i'll go to 4chan and type in all caps.

>> No.180237

>>180235
You have a brain tumor also though.

>> No.180238

>>180236

Pretty much sums it up yeah. Drinking in the workshop, had too much to keep using the prower tools, time for 4chan! WHOOOO

>> No.180240

>>180237

No. Have actual cancer though, contributes greatly to a general attitude of not gicing a fuck.

>> No.180241

>>180240
If you really don't give a fuck, you might as well shoot yourself.

>> No.180242

>>180241

Who said I wanna die? Nothing could be further from the truth.

damn, sobering up. Ah well, gotta get to work in afew hour anyway.

>> No.180244

>>180242
Work's unpleasant, might as well kill yourself.

>> No.180249

>>180244

Actually, I love my job. So like try aaigin.

>> No.180251

>>180249
I'm done trying, your down syndrome makes communication impossible.

>> No.180253

>>180251

That's cuz we were talking abou thow stupid bike generators were, and you were trying to make yourself feel better from other peoiple's misfortune. Cept it didn;t work because they HAVE FUCKING CANCER and are still beter off than you. HA HA.

Loser. On 4chan at 6:23am and SOBER.

>> No.180254

>>180253
Ha ha ha ha ha ha, WRONG, it's 3:26 here retard!

>> No.180259

>>180254

OH! ALL BETTER THEN!

You;re in california, sober, on 4chan at 3:26. OK, sure no problem but sake will make it even better you know it will.

Wait doesn;t CA still have 24 hour sushi delivery? I could use osemr of that.

>> No.180262

>>180259
>You;re in california
Never said I was in California, i'm not even in the United States. I'm in British Columbia, nice try though, makes sense that you'd automatically think I live in California because I said the time here is the same as in California(PST), you're just that idiotic and can't type for shit.

>> No.180265

>>180262
>Never said I was in California, i'm not even in the United States. I'm in British Columbia
I'm so sorry.
>can't type for shit.
Guilty.

>> No.180267

DAMN> Still want sushi.

>> No.180268

>>180157
I just wanted to say that it's not a very good idea, is all. Yes, it will work to some extent but as far as producing electricity for any serious purposes (charging car battery, TV, etc) it's not going to do much.

With a small enough generator it might charge a phone, or let you listen to radio while you work out. Though I suppose car alternator might do if modified to limit the current (or else it will be to hard to turn it) and coupled with a capacitor bank rather then battery.

>> No.180270 [DELETED] 
File: 91 KB, 777x791, Slowpoke_65b2ee_1489385.jpg [View same] [iqdb] [saucenao] [google]
180270

>>180268

KNOW YOUR POKE

>> No.180273

>>180270
It's sad that all it takes is one drunk murrican to spoil this board for everyone. Note I didn't say 'dumb', that's a given.

>> No.180274

>>180273
Yeah, since the complete lack of knowledge, basic physics, and practicality didn't do it.

>> No.180275

>>178831
If you want to maintain this for any actual practical purpose I'd recommend rigging a bike up to an air compressor pump instead. This way you can just save pressurized air and later use it to generate electricity. This is what a lot of wind farms do to store energy.

>> No.181204

the thing is, human can generate about 200W top (from what I've heard) and that is 200W at some serious pedaling.
with voltage regulator and automotive alternator you can get steady charging voltage, but! if you assume total efficiency at let say 50% you got only 100 Watts from your "hard as fuck pedaling" it won't be enough to power your tv :P

>> No.181210

>>180275
are you retarded?

>> No.181791
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181791

>>180275
LOL, nice troll
7/10