PTO driven generator

Sawyer Rob · Sep 13, 2015

That tractor would be over loaded... There are loss' in a generator, (friction rct.) and I don't think you are accounting for them...

Would it do it? Maybe, but I wouldn't do it IF it was MY tractor...

BTW, the OP doesn't have 18 PTO HP.

SR

Egon · Sep 13, 2015

Tractor should be able to run pto hp. Without losing rpm. All day every day.

newbury · Sep 13, 2015

buickanddeere said:
Still stands that the 18 pto HP tractor can drive 12Kw of load as an absolute maximum.

18 divided by 2 equals 9. 12 is 33% more than 9. Should figure on a 9KW or 10KW PTO generator unless your pretty sure there's a more powerful tractor in the future.
I bought my 12KW Winco (for $600) when I had an 18 PTO HP tractor but I THOUGHT there was a 30 PTO HP tractor in my future. Instead I added a 42 PTO HP tractor. Oh well.

Egon said:
Tractor should be able to run pto hp. Without losing rpm. All day every day.

I would expect if a large load came online it might lose a few RPM, but regain quickly.

buickanddeere · Sep 13, 2015

Sawyer Rob said:
That tractor would be over loaded... There are loss' in a generator, (friction rct.) and I don't think you are accounting for them...

Would it do it? Maybe, but I wouldn't do it IF it was MY tractor...

BTW, the OP doesn't have 18 PTO HP.

SR

Iirc tractor data stated 18 pto HP ?

buickanddeere · Sep 13, 2015

newbury said:
18 divided by 2 equals 9. 12 is 33% more than 9. Should figure on a 9KW or 10KW PTO generator unless your pretty sure there's a more powerful tractor in the future.
I bought my 12KW Winco (for $600) when I had an 18 PTO HP tractor but I THOUGHT there was a 30 PTO HP tractor in my future. Instead I added a 42 PTO HP tractor. Oh well.

I would expect if a large load came online it might lose a few RPM, but regain quickly.

The 2HP per KW is a rough rule of thumb to leave some inrush starting capacity and not not operate the tractor at absolute max.
746 watts per HP. Allowing for some mechanical , magnetic, windage, etc losses. 1-1/2 HP shaft HP will
Produce 1KW. With no reserve for intermittent overloads or motor starting. Some tractors are border line for overheating at max continuous power. In particular with the usual clod of oily mud half blocking the middle fins.

Sawyer Rob · Sep 13, 2015

buickanddeere said:
Iirc tractor data stated 18 pto HP ?

The tractor data I saw said 20 engine hp, so you know it didn't only loose 2 hp to the pto... lol

SR

Sawyer Rob · Sep 13, 2015

buickanddeere said:
Some tractors are border line for overheating at max continuous power. In particular with the usual clod of oily mud half blocking the middle fins.

MY experience with the several compacts I've owned is, if you run them near, or at MAX, they will over heat something no matter how clean the rad ect. is... They just don't have the built in reserve of a farm tractor.

One Kubota I had, I rotary cut a field that had HEAVY grass in it. It took several hours to get it done and although the gage got "near" the red, it never touched or got into it. The rad never boiled or showed over heating, but I'm sure it burned/warped the valve guides!

SR

buickanddeere · Sep 14, 2015

Assuming the Kubota 1700D is a B1700 according to tractor data. The actual pto HP is 13 or 14, I must have been into the wrong data. Thus a B1700 would be flat out maxed while generating 8-1/2Kw to 9Kw depending on transmission.

buickanddeere · Sep 14, 2015

Sawyer Rob said:
MY experience with the several compacts I've owned is, if you run them near, or at MAX, they will over heat something no matter how clean the rad ect. is... They just don't have the built in reserve of a farm tractor.

One Kubota I had, I rotary cut a field that had HEAVY grass in it. It took several hours to get it done and although the gage got "near" the red, it never touched or got into it. The rad never boiled or showed over heating, but I'm sure it burned/warped the valve guides!

SR

As long as the coolant doesn't boil within the water jackets and block/head have contact with steam instead of coolant. Most engines will operate without harm at 240F or even higher.
An old engine that has had insulating scale accumulate on the water jacket surfaces and a trace amount of oil mixed with the coolant. The scaled up engine's actual deck and upper sleeve temperature could be hotter with 180F coolant than a clean engine's deck and sleeves with 240F coolant.
50/50 with a 15psi cap boils at around 265F.

RonJ · Sep 14, 2015

Thanks for all of the comments. Looks like I should have been more specific in my original thread. Tractor is Yanmar 1700D and generator is a ST-10. I don't figure on getting max output from the generator based on the Yanmar 1700D's rated horsepower.
After looking at the possibility of using belts to go from 540 rpm to 1800 rpm I ordered the gearcase from the manufacturer. Should be here tomorrow. Will try to post some pictures when everything is hooked up. This setup will be used for auxilary backup to our home and will be parked in a detached garage. Hopefully this will serve as a "safe,clean environment" and I won't have radiator problems as long as it's clean before. The Yanmar doesn't have a water pump so Should I add a cooling fan? The auxiliary power connects to a transfer switch.