Tractor PTO Generator Sets

   / Tractor PTO Generator Sets #1  

HAR

Silver Member
Joined
May 3, 2006
Messages
167
Location
Vermont
Tractor
Kubota B7300 (1999)
Hi guys:
It has been awhile since I have been here or posted.

After the recent TS Irene hit our area and using my tractor driven generator for a few days, I just finished up doing some PM my B7300....actually hit the 600 hr mark on the meter during the storm. Once that was done, I thought I would look at what others were doing with PTO GenSets.

I purchased my B7300 used in 2002, and got a Winco PT0-7 (Winco Generator Home Generators | Backup Generator | Whole House Generator | Home Standby Generators - PTO - Tractor Driven Generators) in 2003. Since then they have dropped the smaller generators(PTO-7, PTO-11) that worked fine with some smaller tractors. While the GenSet has been used some off and on over the years, this was the first extended use. My home does not draw much power, and during outages I am most concerned with heat, refrigeration, and lights. While connected to the house with a double throw, I do not try to run the whole place. I consider just heat, lights, and fridge/freezer a luxury during a storm.

During day light hours when people are doing things in the house, I run tractor at 2900RPM and the PTO at 540 RPM. At night or when it is really quiet, I run the tractor at about 1750 RPM and PTO at 950 RPM. As I have no pumps or other high draw motors, there is no real power draw that will bog the engine or genset down.

I set the meter on the GenSet at about 125VAC and my lights do not flicker at all and everything seems to be okay. Even my sensitive computer UPS units do not "complain".

During the Irene storm, over 2 days, I used just under 12 gal of diesel, which I felt was really good for about 46hrs of generation.

I purchased my GenSet with a 3-PT attachment, and delivered at the time it was just under $1400. That has worked well, but when I have an outage, I must go through the motions of connecting the 3-PT and then connecting to the house. As I do not often have any other 3-PT attachment other than the snowblower attached, I have thought since this storm that some time I might remove the GenSet from the 3-PT unit and mount on a pad in front of the house and enclose that so I would only need to remove anything I had attached and back the tractor to the generator unit. I will try and update this if and when I do that.

The attached picture was taken just before I disconnected after the storm.
 

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   / Tractor PTO Generator Sets #2  
Good post, thank you!
 
   / Tractor PTO Generator Sets #3  
Around here, when there is a storm, and no power, we tipically go to bed with no power running (shut generator down). The little added convience of being able to turn on a light or such is overridden by the fact that once the power goes out in a large area, service stations also have no power and can't pump more fuel for the generator. So conserving what fuel is on hand becomes a secondary thought. Keeping one to two weeks of fuel onhand all the time can be a problem. I typically get up in the wee hours of the night and fire off the generator to let the freezer catch back up, etc.
Another concern with leaving a generator runnning, or any other method of supplying electricity, is that motors make noise. Since the noise level is down due to limited amounts of other such noise makers, thieves can zero in on just who has a generator. Even a secured tractor can be loaded in a matter of minutes before you realize you have lost power, and are trying to get dressed in the dark. A rechargeable flashlight by the bed tends to be too easy to locate if the power goes out unexpectedly.
Some folks don't need to worry about their tractor driving off while they sleep, but I am not going to leave the keys in mine, with it running, and go to bed. Everything MIGHT be ok in the morning, but if it's not, it wouldn't have been worth the risk.
David from jax
 
   / Tractor PTO Generator Sets #4  
IMHO.. I'd run a genset at rated rpm for rated freq... JMHO

soundguy
 
   / Tractor PTO Generator Sets #5  
IMHO.. I'd run a genset at rated rpm for rated freq... JMHO

soundguy

OK, Soundguy...at night, when you need less power, why run the generator at full power (or am I missing something?)

Seems like you'd use less fuel per hour of operation...
 
   / Tractor PTO Generator Sets #6  
most gensets make 60hz at 540 rpm.. it's a locked ratio.. if you run at half rpm.. not only is voltage lower, power is lower.. and well.. freq is lower... many items do not like low fre power. some stuff tolerates 48-62 depending on the power supply type.

soundguy
 
   / Tractor PTO Generator Sets #7  
freq hit on rpm is based on the # of poles on the genny. cheaper are 3600rpm internal units.. better are 1800 rpm.. etc.. etc..

soundguy
 
   / Tractor PTO Generator Sets #8  
Soundguy........ Is that why fridges/compressors and motors etc don't like "Brownouts"? I was aways told to shut em down when the voltage gets a little low.
 
   / Tractor PTO Generator Sets #9  
You got it, only way around it is if you have a two speed PTO where you could keep PTO rpm at 540 but back tractor rpm down.
 
   / Tractor PTO Generator Sets #10  
You got it, only way around it is if you have a two speed PTO where you could keep PTO rpm at 540 but back tractor rpm down.

That's why I love my old David Brown 885. Runs the whole house at 1100 ERPMs on the high speed PTO. Sips 1/2 gal of diesel per hour and so quiet I can hardly hear it.
 
 
 
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