WVO generator powerplant - Page 4 - PeachParts Mercedes-Benz Forum

P.E.Haiges · #46 04-29-2010, 01:10 AM

A four pole alternator would have to run at 1800 RPM for 60 Hertz electric energy.

Tractor engines usaually run at slower RPM that car engines and the PTO speeds are even lower. So the tractor alternator might be a 6 pole or 8 pole alternator for running at 1200 or 900 RPM. This is alternator shaft speed not tractor engine speed.

Make sure U get an alternator to match the speed of the engine. 1800 RPM would be a good choice for the MB engine U also have to have the right size alternator (in KW) to meet your demand.

P E H

amosfella · #47 04-29-2010, 01:57 AM

The PTO gens are usually listed as being 540 input and 2250 internal. if one was to take the gearbox off, one could use the 2250 speed. would help prevent varnishing...

P.E.Haiges · #48 04-29-2010, 03:13 AM

amosfella,

There is no way U can get 60Hz AC energy from a shaft going 2250 RPM. It has to be an inverse multiple of 3600 RPM such as 1/1 (3600), 1/2 (1800 RPM), 1/3 (1200 RPM), 1/4 (900 RPM) ETC.

3600 RPM divided by 60 seconds per minute equals 60 cycles per second or 60 Hertz (Hz). This would be for a 2 pole alternator.

P E H

mespe · #49 05-02-2010, 08:35 AM

Quote:

Originally Posted by psdsteve

Something no one else mentioned is that the oil you are going to be collecting from the businesses is going to be solid at those outside temps.

I live in Northern California and when the temps drop to the 40's it starts to become an issue with the oil solidifying.

Something to think about anyway.

Stephen

Not a problem running 24/7 heat the solid WVO with excess heat from the engine.

layback40 · #50 05-02-2010, 08:54 AM

Maybe the frequency is not so important, just rectify it & then use an inverter to get 60hz, that way any rpm/load variation would not damage electronics.
I think it would be best to be running it on filtered waste dino oil. Use the WVO in your wood heater. We do that here.

amosfella · #51 05-02-2010, 12:45 PM

Quote:

Originally Posted by P.E.Haiges

amosfella,

There is no way U can get 60Hz AC energy from a shaft going 2250 RPM. It has to be an inverse multiple of 3600 RPM such as 1/1 (3600), 1/2 (1800 RPM), 1/3 (1200 RPM), 1/4 (900 RPM) ETC.

3600 RPM divided by 60 seconds per minute equals 60 cycles per second or 60 Hertz (Hz). This would be for a 2 pole alternator.

P E H

You're right, my bad. Got the plate on the gen confused with another machine on the yard...

88300D · #52 05-03-2010, 07:42 PM

If i was deciding how often to change the sump oil on a stationary engine i would do oil sampling.

I do it with my cars, CAV power charge $25 and with detailed analysis offer advice on oil life before next sample.

I would also seriously consider a centrifuge, deisel craft and others make them as after market units.
I have one for my veggie oil and while i would not recommend them for WVO i would for a sump on stationary donk.

I have also heard you can get 2nd hand units on ebay UK off of land rovers for around $100 AU.

Peace and blessings

biopete · #53 05-04-2010, 01:17 AM

Very interested in this. Thinking of doing it with a spare TDI engine i have . We're out of electricity right now. Here in temperate Tennessee I'd just run it as i needed. Maybe run it 4 hours a night to power batteries and cook and heat water for baths. That would be cool to be off grid running on wvo power.

In the mean time, i have a big inverter for my car and pull it close to the house and plug stuff in to it. But its not good to idle at 900 rpm on wvo . You get a better burn at 2000 rpm according to the Elsbett manual. I'm inclined to believe it.