Bicycle Generator (3)

[pixar5]

which dc motor would be good for this as i wired up a alternator and got no power at all very dissapointed hope you have the answer for me

[flufferman1]

i'm sorry wilfred but he lied, you will never be famous with a name like that...

[mattehv]

go for it wilfred

[Isochest]

I like it: Turn that excess lard off one's backside into electrical power. Could it motivate the Couch Potatoes who watch daytime TV to get off their big bottoms? But then again, getting up is what one does to get a microwaveable burger in a bun isn't it?

[d5gdf56gdfg]

If i get a bicycle generator where can i get a slave child to power it? I'm trying to be more eco-friendly here people!

[theRising5un]

I did the same thing, I used a rather expensive PM dc motor. I have a similar bike.

I use it to charge a 12v deep cycle battery then I watch TV from it. I have a 32" TV that is only 70W, amazing eh?

My solar panels do most of the work however.

Cheers.

[rodrigomaluf]

i have this bike , what kind motor can i use ?

[james9149]

It's a permanent magnet 300W 12 V DC motor, toothed-belt drive. Choose ratio to get 1500 rpm with 60-120 rpm on the bike pedals. Because it's a PM motor, it works equally well as a generator.

Tim.

[SSparks555]

I have a similar set up to this. I used an electric motor out of an old electric lawn mower (120v dc) connected to a 1.2 Farrad capacitor wich can run a 19" tv someowhat comfortably. A 60 watt 12vdc light bulb is a bit of a chore.

[SSparks555]

Small fl. lights like the ones in your video are a breeze to operate.

[freshnelly]

Great vid! I'm from Essex too Cheers! I am planning a compact ped gen. for a boat, but worried about ratio vs friction. Any thoughts?

[james9149]

Frictional loss in our generator (mainly brushes) is about 12 watts at 1500 rpm when its output is 12 V. Don't know what's lost in the chain/toothed-belt drive. You need to make the overall drive train ratio such that pedal rate is comfortable for the 'rider', say 60-120 rpm. Hope this is useful! Tim.

[SSparks555]

I used an old 10 speed bicycle wich allows me to adjust to ratio to whatever is comfortable for me, also considering the load.

[5horsepower]

i want to make a electric generator with a weed wacking gas moter how do i make one of thse things that controlls how much power there is i dont want it jumping up an down want to plug thing into it like drill

[5horsepower]

i see what your saying about load settings and i wanted to say that i stuck a dc moter on my bike witch was on a stand and i spun the peddles and put the moter on the wheels and got 62 volts how many watts it that

[james9149]

Apart from frictional losses, no power is produced unless you also draw some current (try loading with light bulbs). Then power = V x current. Note that a dc motor with a field winding won't actually work well, if at all, as a generator. You need a permanent magnet type, which is what the bikes in the videos use; that works fine. Once it's producing useful power pedalling gets much harder!

[5horsepower]

my friend can do 220 rpm on a training bike and hold it for like 5 minutes i wonder how much power he could create

[james9149]

It all depends on the 'load' setting on the training bike. A reasonably fit person could easily manage 200 watts for 5 minutes, but a fully trained athlete can do 500 watts or more sustained. 200 watts for 5 minutes is about 0.017 kWh. Another way of looking at it is that it would take 28 minutes at 200 watts to heat 1 litre of water from 20C to boiling. Tim.