JD PTO Gen and Q's

   / JD PTO Gen and Q's #1  

trlong

Platinum Member
Joined
Sep 19, 2004
Messages
632
Location
Vermont, USA
Tractor
J.D./4115
JD PTO Gen and Q\'s

I know there are a lot of threads on PTO Generators. However, I haven't found any mention of the J.D. 10kW generator, apparently marketed for the 2210 and other similar (24hp, 19 hp PTO) CUT's. I just saw one at the local J.D. dealer, attached to a 2210 (unsure of the company making it for J.D.). The pricetag, ofcourse (J.D.) nearly floored me (~ $2,300) but then I started figuring up comparable genny's with 3ph mounting (or trailer) and driveline, shipping, etc... Now I'm not so sure they are far out of line. The $2,300 includes the 3ph mount (kindof a carryall, tube steel), driveline, they're local, and they'd deliver.

Inquiring minds still would like some thoughts on;

1. What should the reasonable conversion factor be between rated pto hp output to rated kW output? [I've heard everything from about 2/3rds to 1/3rd]. I would think, perhaps erroneously, that since 19 hp ~ = 14.1 kw, then obviously some efficeincy losses (20%?) would get down to about 11.3 kW, then de-rating to 80% would get one to ~ 9 kW (too much de-rating?). This would oversize the 10kW unit for the 2210, a little. Would 10 kW be reasonable for a 19 hp rated pto?

2. Since, for me, any "backup generator" would be just that, backup (or just to run a few small power tools away from line power), is an automatic vs. manual utility power transfer switch worth it? My wife might find it handy but, it is doubtful she would attach the genny to the tractor, back it to the house, connect it, and start it up.

3. I don't expect to run the house during a power outage, as if line power were available. I would expect to just keep the fridge, freezer, water pump (1/2 hp, 130' deep), and maybe a 60w light or two going, for a few hours as needed. I see a number of limited circuit backup transfer switches. Any thoughts on these, vs. cutting off the mains from line power, entirely? One place told me that they install 6 or 8 circuit transfer switches and just have the home owner shut off breakers to circuits that are not crutial. I'm not enamored with using circuit breakers as switches and certainly not the GFI's which have more limited life cycles (I believe).

Guess that's enough to chew on for a while.

Tom
 
   / JD PTO Gen and Q's #2  
Re: JD PTO Gen and Q\'s

When i was searching for a pto gen last year.. A JD unit was the first I looked at.

Most of the specs i see are rated around what northern shows.. about 2hp per kw.. That means.. 24pto hp to yeild 12kw output.. I think there may be a little fat in that.. but don't think its much.

As for a tractor that can't fully utilize the gen.. i don't think that is necescarilly bad. Say you have a 10kw genny.. but only have 9kw worth of engine... At 9kw output.. you are not going to overload the genny. In other words.. I'd rather run a 12kw genny at 10kw.. than run a 10kw genny at 10kw. The same can be said for the tractor.. a little more tractor than genny is ok too.. more reserve hp to make a smoother operation during load up.. less response time for the governor to get rpm back up.

For instance.. my 12kw genny running on my 8n.. Motor startups from large power tools did make a small rpm flucuation... when i had the same genny on my big diesel 95hp tractor.. no fluctuations.. no nothing.. etc.

Kinda sacrifice a little fuel usage there.. however.. if the engine is only have to provide x kw.. then you aren't wasting too much fuel..

Soundguy
 
   / JD PTO Gen and Q's
  • Thread Starter
#3  
Re: JD PTO Gen and Q\'s

Soundguy,

Thanks. I figured you'd weigh in on this. Since I was leaning toward a 10 kW, it seems the J.D. (O.E.M. unknown) might be a decent choice, except maybe the $'s. As I plan, as said, as backup for critical circuits, I don't think I'd really be running 10 kW, except surges might get me if not careful. And, I don't expect I'll be running 'puter's and critical electronics off it.

Think I need some better, more complete, spec.'s on some units before taking the plunge.

Tom
 
   / JD PTO Gen and Q's #4  
Re: JD PTO Gen and Q\'s

I used to milk 46 head of cows for a guy. He had a 50 kw hooked up to a 4230 (120 HP) Deere to run the operation when we lost power. That tractor never bogged down under a load. He ran that non stop for 14 days in 1991 after Hurricane Bob blew through RI.
 
   / JD PTO Gen and Q's #5  
Re: JD PTO Gen and Q\'s

In a perfect world there are 746 Watts in a Horsepower. So, 19 HP at the PTO could yield 14 KW out of a perfect generator. I like soundguy's general statement that it takes two HP to get 1 KW. It allows for the real world inefficiencies (sp?). Anything more is gravy. View the difference between 10 KW (likely) and 14KW (theoretical) as the ability to start big motors like well pumps, air conditioning and air compressors.
 
   / JD PTO Gen and Q's
  • Thread Starter
#6  
Re: JD PTO Gen and Q\'s

Rick, and V8Dave,

Thanks. That's more in line with what I thought reasonable...about a 1/2 ratio, PTO HP to rated kW. I think the guy trying to sell me on 1/3 ratio was not interested in selling any PTO driven units. However, I guess I should be bit more thorough and check the surge current ratings on the Fridge, Freezer, and well pump motors. If running for backup for only a few hours at a time, it's likely they might all try to surge at the same time.

Tom

BTW: There is a nice, free little 'puter conversion program (convert.exe) for temp, pressure, power, volume, flow, force, mass, area, torque, angle .... if any one is interested. Been using it for years. Pretty handy. If interested, let me know and I'll send the .exe or find the download website again.
 
 

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