Thread: what do you think, are these BS ?

Originally Posted by long stroke

Someone needs to buy one and prove it!

If you can get the power usage figures for one then you can prove it without wasting your money - by doing a few back of the envelope calcs.

As someone mentioned, there are power losses driving the alternator, and converting kinetic energy into electrical energy. Let's forget that for a moment, and say that the device sucks 50A of juice @ 13.5V when running (doubt it would be anywhere near that high).

50A @ 13.5V = 810W = 0.81kW. However, when sizing fans of that type, you assume only 60% efficiency, so the actual usable energy the fan could give would be about 0.5kW tops. Now assuming about 10% losses (pressure drop), you would be lucky to get 0.4kW of usable energy.

And that is a BEST case scenario...

So....................

Should I buy one ?

Originally Posted by HangOver

So....................

Should I buy one ?

Go for it I say, get the one thats run off a USB adapter and ulitise it as the male equivalent of a Venus chair.