PTO generator

[DarkBlack]

Originally Posted by Rob-D

There is no inversion on the AC side, the Honda gas engine turns the Alternator. The inverter side (DC) is very low amperage. My Honda EU2000i runs 120v/16.7 amps AC but only 96W DC (12V x 8A).
Inverters, even very highly efficient ones still lose a few percent, this with any DC generator driver loses would have lower efficiency than an alternator brushless system. This is one reason why cars went to alternators. You can get 100 amp alternator in a car that is very small. The trick in cars is that they use the fan belt and gearing to turn the alternator very fast, that's why lights dim slightly when the car is idling. Spinning a generator at those speeds would explode the armature. Alternators run three phase, 120 degrees apart. the overlapping phases get rectified by the diodes in a delta 'Y' configuration and the battery sees a relatively smooth voltage. On the Honda EU2000i they use a small rectifier off the alternator for the 96W DC out. (small battery charging)

I'm not sure why you're talking about noise? The EU2000i is about as quiet as you can get in my view.The brushless alternator is quiet, the engine sound is all you get, that would be the same regardless whether it's inverter or direct alternator.

What are diodes in a delta "Y" configuration?
There is the question again rob.

 

[Rob-D]

Originally Posted by Rob-D

There is no inversion on the AC side, the Honda gas engine turns the Alternator. The inverter side (DC) is very low amperage. My Honda EU2000i runs 120v/16.7 amps AC but only 96W DC (12V x 8A).
Inverters, even very highly efficient ones still lose a few percent, this with any DC generator driver loses would have lower efficiency than an alternator brushless system. This is one reason why cars went to alternators. You can get 100 amp alternator in a car that is very small. The trick in cars is that they use the fan belt and gearing to turn the alternator very fast, that's why lights dim slightly when the car is idling. Spinning a generator at those speeds would explode the armature. Alternators run three phase, 120 degrees apart. the overlapping phases get rectified by the diodes in a delta 'Y' configuration and the battery sees a relatively smooth voltage. On the Honda EU2000i they use a small rectifier off the alternator for the 96W DC out. (small battery charging)

I'm not sure why you're talking about noise? The EU2000i is about as quiet as you can get in my view.The brushless alternator is quiet, the engine sound is all you get, that would be the same regardless whether it's inverter or direct alternator.

What are diodes in a delta "Y" configuration?
There is the question again rob.

Ambigous question.
What do you want to know? What they are for? Is that what you're asking?
What type of diodes?
What their function is?
What their amperage is?

Do that Google search yet? Here's a picture to help you out. See the diodes?

 

[DarkBlack]

Ambigous question? :laughing: You wrote it!! I added "what are"!

 

[Rob-D]

Ambigous question? :laughing: You wrote it!! I added "what are"!

No, I wrote "phases get rectified by the diodes in a delta 'Y' configuration". Meaning the diodes associated with the alernator field windings rectify the AC current to form DC.

You wrote:

"What are diodes in a delta "Y" configuration?"

The diodes aren't in a 'Y' configuration the fields are but I think you knew that and just wanted to be petty and a wise guy.

 

[Rob-D]

Ambigous question? :laughing: You wrote it!! I added "what are"!

Out of context.

 

[MessickFarmEqu]

we have the last 2x 20KW commercial units Tiger-Power will make. $3995, list is $5200. These showed up POST storm, we sold out of 20+ PTO gensets before everything hit.. these are a second lot.

 

[npalen]

I could see the slower engine speed being an advantage where the tractor has plenty of HP for the size of generator needed. The obvious advantage would, of course, be less noise but some tractors are actually more efficient at lower RPM.

That's great IF the PTO HP can handle the lack of gear reduction. PTO generators run ~2600 engine speed to 540 gen speed. A PTO HP rating of 25 at 540 rpm from an engine spinning at 2600 rpms has greater torque than the same engine running at 1000 rpms with a PTO of 540. Think of your car trying to pull you up a hill from a dead stop in top gear.

 

[Tcfake613]

Sheesh... Didn't expect such a response!!


Well you folks make a lot of excellent points. One of them being the fact that last year at this time I was plowing my driveway during a power outage. Yep I only have one tractor. Someone mentioned buying TWO gennys. One for the PTO and one gas portable. Which really isn't a bad idea. We own a fifth wheel and I've been in a situation or two where it would've been nice to have one. Actually been in a couple campgrounds where we lost power.

Anyway, we got lucky and only lost power for a short time during the night. No big deal. My brother in law (about two miles away) is still out of power and has a Honda 2000 keeping the fridge cold right now.

Bottom line is I'm tired of putting this off and not having one when I need it. So I will be researching and finding a good deal.... Maybe two good deals.

 

[sdkubota]

I finally got my Rural King 15kw PTO powered generator up and running today. Voltage and hertz very stable while testing. Tractor seemed at ease powering it at 540 rpm. Now I need to get my 50 Amp etnrance box installed and hooked into my main panel using a interlock.

 

[zoltanthegypsy]

Tc, glad to hear you made it through with minimal hassle. That's no excuse for putting off that new generator until the _next_ storm

Sorry for taking your thread off into the weeds. It happens...

Z.