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Old 06-19-2017, 08:11 AM
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rustythe4x4 rustythe4x4 is offline
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Default New to me roll your own power

Took a road trip yesterday with Mrs Rusty and Rustyjr into the wilds of mid-North Saskatchewan to pick up a new to me gently used 30kw pto generator/alternator. The plan is to mate it to a nice little Kubota diesel from a sea-can reefer to stand as back up power when disaster strikes, whicH seems to be too often when you rely on power for your geothermal heat. A mostly uneventful trip thankfully, with the exception of seeing a pile of wildlife including a black bear scooting across the road from one forest wall to the other .

I will post up build progress once there is some.
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Old 06-20-2017, 01:17 PM
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That's a nice beastie.

I have a used Kubota diesel off a welding machine that needs a rebuild kit and bearings just waiting for something like this.

I ran across a little 3 cyl gas engine and trans out of a Geo Metro just before the Kubota and thought I'd use it for the same thing. Good find.

Not remembering for sure what size my Gen set is, I do know that I can run the shop, including compressor and welding machines and or lathes and mill.

It's on a skid with a quick hitch that I mount on the back of one of my SA tractors with a drop gear box for the RPM. I'm lazy I guess.
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Old 06-25-2017, 12:14 PM
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Tested the unit out yesterday with the tractor. Runs beautifully!
The Kubota engine I'll be running it with should deal with the 30kw load, even though it is under the 2hp per kw recommendation. Nominal load won't be anywhere near peak, so it may bark a little when a motor starts, but it will be ok.
I am going to run a 540 style shaft off a belt drive from the flywheel, suggestions on how many belts to run? I was looking at using 3. Engine is about 40 horse.
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Learning boils down to "Repetition or the avoidance of pain", some people learn by doing, some by watching and some have to pee on the electric fence. - Norm W.

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Old 06-25-2017, 02:03 PM
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Quote:
Originally Posted by rustythe4x4 View Post
Tested the unit out yesterday with the tractor. Runs beautifully!
The Kubota engine I'll be running it with should deal with the 30kw load, even though it is under the 2hp per kw recommendation. Nominal load won't be anywhere near peak, so it may bark a little when a motor starts, but it will be ok.
I am going to run a 540 style shaft off a belt drive from the flywheel, suggestions on how many belts to run? I was looking at using 3. Engine is about 40 horse.
Diameter of the pulleys makes a difference. Larger pulleys less belts.
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Last edited by milomilo; 06-25-2017 at 02:43 PM.
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  #5  
Old 07-02-2017, 11:01 AM
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I stripped down the reefer that holds the donor engine, including the wiring harness. It has an auto throttle positioned (governor when couples to other electronics) that I may be able to incorporate into the final design.

I have been rethinking the belt drive vs. A mechanical drive (such as a gearhead intended for a rotary mower with the appropriate gear reduction) would work well, and will put no side load onto the crank bearings.
Thoughts?
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Learning boils down to "Repetition or the avoidance of pain", some people learn by doing, some by watching and some have to pee on the electric fence. - Norm W.

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And a man's foes shall be they of his own household
-Ironman quoting the Bible
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Old 07-02-2017, 04:29 PM
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Default Belts vs gears

I have always understood that belts were the most efficient power transmission tech.
Maybe toothed to lessen the tension needed?
There are plenty of auto timing belt sizes to pick from.
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Old 07-02-2017, 04:47 PM
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Quote:
Originally Posted by rustythe4x4 View Post
I stripped down the reefer that holds the donor engine, including the wiring harness. It has an auto throttle positioned (governor when couples to other electronics) that I may be able to incorporate into the final design.

I have been rethinking the belt drive vs. A mechanical drive (such as a gearhead intended for a rotary mower with the appropriate gear reduction) would work well, and will put no side load onto the crank bearings.
Thoughts?
A lovejoy connector would do that too.
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Old 07-02-2017, 11:52 PM
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Yeah a lovejoy is my preference but the engine's optimum rpm range is 1800 to 2100 rpm, and the input of the generator is 540 rpm.
Since the genny is in perfect condition, I choose to find a way to run 540 off the engine. 3.5 to 1 ratio should just about be perfect. I think a gearbox available off the shelf will likely be the best with less fuss.
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Learning boils down to "Repetition or the avoidance of pain", some people learn by doing, some by watching and some have to pee on the electric fence. - Norm W.

Mathew 10:36
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-Ironman quoting the Bible
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Old 07-03-2017, 12:05 AM
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I'd dig into that gear box on the end of the gen. The gen is either a four pole (1,800 rpm) or a two pole (3,600 rpm). If it's a four pole I'd try to find a way to remove the overdrive and direct drive it from the engine.
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  #10  
Old 07-03-2017, 07:52 PM
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It's 1800rpm.
I really didn't want to remove the gearbox on the front of the generator, since it is a complete unit intended for PTO drive.
I won't have a lot of time in the next couple weeks to diddle with it, but I will flip through the severe manual and see how easy it is to remove the gearhead.
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Living the country life


Learning boils down to "Repetition or the avoidance of pain", some people learn by doing, some by watching and some have to pee on the electric fence. - Norm W.

Mathew 10:36
And a man's foes shall be they of his own household
-Ironman quoting the Bible
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