Kubota EA300

[Tanman]

Now it's time to acquire a suitable generator head, I'm thinking the northern tool 5kw model https://www.northerntool.com/shop/tools/product_9040_9040 but am open to suggestions.

[mike90045]

With as many corners being cut and trimmed in manufacturing nowdays, a slightly oversized generator head is not a bad idea.  you get better phase imbalance performance and cooler running of the generator gear.

[Tanman]

I'll probably spring for the slightly bigger one then, sometimes they have a sale on them. I'm also picking up a flux welder this week and plan to put together a frame for the engine and head. I recall seeing a picture on the forum somewhere of some Changfa type generator frames that people had built, one had the alternator either directly above the engine or at a 45 degree angle above. I remember a few different examples, does anyone know where those pics might be hiding?

[guest18]

Here is one,

http://www.nextgenerationpower.com/Info/Support/3-5Specs.pdf

http://www.nextgenerationpower.com/Info/Support/UCM1-35.pdf

 They would be the ones to talk on where to get the parts. Been knowing them for years. Good people to work with.
You might be able to get used parts from a worn out unit. And possibly a matching generator head that fits on the bracket.

http://www.nextgenerationpower.com/

Here is the portable unit that’s sold at Hardy Diesel.

https://www.hardydiesel.com/product/kubota-3-5-kw-micro-diesel-generator/

This info should give you some ideas.

Henry

[guest18]

With as many corners being cut and trimmed in manufacturing nowdays, a slightly oversized generator head is not a bad idea.  you get better phase imbalance performance and cooler running of the generator gear.

Exactly, and you would probably pick up some efficiency going slightly larger.

For example:
The Markon BL105E generator head was rated at 4992 watts. It was used on the Next-Gen generators with the Kubota EA300 engine. This engine was able to run this generator head to put out 3500 watts.

Henry

[guest18]

A 5000 watt head would be a good fit for the Kubota.

[Tanman]

Thanks Henry, I didn't think anybody still used these but I was wrong. They will have a ton of knowledge on that platform.

[Tanman]

Here is the EA after the shop and painted.

[Tanman]

Now I need to buy a welder, get some steel, design a frame, and get a generator head, make a wiring harness and It’ll be great. Piece of cake, or if your like me Lefse!

[guest18]

Engine looks great! Is that a Centrifugal  Clutch on the output shaft?
If you can, please take a picture of the crank case access cover. Their were a few different ones used and I’m curious which one you have.

Henry

[guest18]

Ended up dropping it off at the shop to have the valve seat repair, new valves and valve guides installed and lapped, cylinder honed and new rings, as well as a new rod bearing. Now while that is getting built, I need to figure out what generator head to slap on the things. I wish I could find an 1800rpm 3kw 1ph 115v brushless head, any thoughts?

In your situation, I believe your thinking of using 120 volts I would buy a generator head that you can wire the field windings parallel for 120 only. This will allow you to run the generator at full output at 120 volts. And in your case, running the generator to 3500 watt limit should reduce heat and in turn lengthen the life of a generator head. If you can, try to get a head and fuse it to 30 amps at 120 volts. This setup should protect the engine from bogging down and in turn should prevent loss in frequency.

Here is a good option: If your interested, and can’t find one, PM me and I’ll make a call.

Brushless/Capacitor regulated:  https://www.meccalte.com/downloads/S16W_HD.pdf

 S16W-105 would be a good size. (Slightly oversized)
At a power factor of .8 the head should be capable of putting out 3.92 Kw at 60 hertz.

Henry

[Tanman]

Well I'm a little torn because my transfer switch for my house has a 240v input socket; however, we are thinking about moving soon and I think this generator will be used as part of a backup power system that would include a battery bank and charge controller. So I need to figure out if the AC input for the charge controller (for the battery bank) takes 110v or 220v. I believe its 110, in which case the head you suggested should work well.

And yes it came with a 2 belt centrifugal clutch pulley.

[guest18]

A Carrier spec’d EA300. First time I’ve seen one. Very interesting. The cover plate has two lines on the bottom. Did the engine have an auxiliary oil tank, oil cooler or oil filter? I like what I see.

[Tanman]

Yes it has an auxiliary oil filter and an oil drain line. I don't have it installed yet but have it. It also had a pretty robust fuel filter setup, but I probably won't be running a fuel pump so will probably just setup a gravity feed and inline filter.

[daniebird]

Yes it has an auxiliary oil filter and an oil drain line. I don't have it installed yet but have it. It also had a pretty robust fuel filter setup, but I probably won't be running a fuel pump so will probably just setup a gravity feed and inline filter.

Do you have any info/ pictures of the auxiliary oil filter set up? Looking into something the same myself.

Thanks,
Dan