Abby’s Guide > Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) > Discussions > I'm looking to buy a genarator for at least 20 amps
Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions |
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carlb
Joined: Nov 16, 2010
Points: 279
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Re: I'm looking to buy a genarator for at least 20 amps
Reply #14 Jan 17, 2012 12:23 pm |
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Wow....  I would love to see that. Do you have it geared up by the belts, so your 650 RPM on the engine gives you the 1800 RPM on the gen head? What do you mean, it's set up to run 85% natural gas, 15% diesel? Those two fuels sound so incongruous (at least to me) that it almost feels like you're pulling my leg. A gas and an oil, together? 1,000 lbs, and 4kw? Wow, you may win the lowest watt/lb award  Sure would be nice and quiet, though (at least by comparison) spinning that slowly. Mine is pretty loud, roaring along at 3600. I think it would be cool to take a big (~20+ hp) engine, maybe off something like a lawn tractor, run it down at 1800 RPM, and use it to spin either an 1800 RPM head, or alter the belt ratios and use a 3600 RPM head. The engine would be making much less than its rated power, but it would also be a lot quieter. A diesel is the obvious way to do that, but diesel engines are less common and more expensive, it seems. Is yours one of the big Lister (?) setups I've heard about? Or something else altogether? Here are a couple of links to my Lister setup. The belt on the 24" flywheel powers a 8.7" pulley on the generator for a 2.76:1 ratio or about 1800rpm at 650rpm http://www.youtube.com/watch?v=UfGjlHNX-68&feature=mfu_in_order&list=UL http://www.youtube.com/watch?v=AwPPui8Fyi0 http://www.youtube.com/watch?v=LL2zUvQIIuY
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RedOctobyr
Location: Lowell area, MA
Joined: Nov 5, 2011
Points: 282
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Re: I'm looking to buy a genarator for at least 20 amps
Reply #15 Jan 18, 2012 7:10 pm |
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Are those your videos, carlb? They are very, very cool. That is a great setup. Things that I loved: - Big exhaust setup with expansion tank and automotive muffler, vented out through a wall (at least in one of the videos). - Radiator plumbed in, with an overflow tank. - Exposed pushrods (!) - The air starter is fantastic. Air powers both the motor and the cylinder to automatically bring it in contact with the belt. Brilliant. - Wild dual-fuel setup (again, in at least one video), with an electric valve for the natural gas, which is powered by the generator itself. Any loss of power means the gas valve closes automatically. - Seems quiet. Certainlyl low RPM. Will probably run forever, from a durability standpoint. As I was watching some of the videos, I kept thinking of Rube Goldberg. That typically has negative connotations, and I don't mean it like it that at all. I mean it as a compliment, because the narrator kept showing additional features, tweaks that were made, valves for this and that. The list appeared to just keep going. This was not a drop-it-in-and-go setup, it would appear. A lot of time has been spent to tweak & optimize, and tie it into the house and utilities. I assume that the dual-fuel setup would let you practically run indefinitely as long as you have natural gas. Even if the gas supply goes out, I'd expect this is pretty fuel efficient. Can you start it by hand somehow? If the flywheels are 250 lbs, I expect you can't simply grab their spokes and give them a flick. I could see something going around on the inside of the flywheels, where the spokes meet the outer wheels. As if the ends of the spokes are not all the same size or something (there's also a white thing going around with the flywheels, maybe that's it). Is there something like a balance weight on there? The biggest downside I can see may be that now I want one  If your power goes out frequently, and you have the space, that must be great to have ready for action. Fantastic work on getting that all sorted out! |
carlb
Joined: Nov 16, 2010
Points: 279
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Re: I'm looking to buy a genarator for at least 20 amps
Reply #16 Jan 18, 2012 8:20 pm |
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yes that is my setup and i am the one narrating the video's as i took them. There were a number of refinements since the early video with the exhaust going out through the roof. There is a balance weight on the flywheel and that is what you see. There is a hand crank that slips over the end of the crankshaft to hand start the engine. It has a manual decompressor so that you can crank it up to speed remove the handle and disengage the compression release. at at 3kw load it only uses a quart of fuel per hour running on diesel. Running natural gas and diesel just about 6 oz of diesel per hour. It can run for many days on the 2 gallon tank. The pushrods need to be oiled about every 10 hours or so of running (just a little squirt) This setup was built from pieces the engine and generator were sourced from a guy up in main. The frame I built using 1 beam and some large timbers. It was a fun build and it should last a lifetime. Very slow speed huge crank shaft, a connecting rod as big as your lower arm and almost as long. The piston and rod weigh over 8 lbs. Ps. About wanting one. These are getting hard to find in the states because the EPA has banned import of these engines but some are still to be had. Here is a link to one of the sites that i belong to that deals with a lot of these engines. Look under the listeroid/perteroid section for this type engine. http://www.microcogen.info/index.php Carl
This message was modified Jan 18, 2012 by carlb
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aa335 wrote:
