Running a Generator on a 7500: Kubota Review  -- Kubota Tractors Discussion Forum and Review Running a Generator on a 7500: Kubota Review -- Kubota Tractors Discussion Forum

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 06-28-2003, 21:26 Post: 58493
Rob-Fisher



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 Running a Generator on a 7500

Guys, Can I run a Home Type Generator on the 7500
for any length of time?
Regard, Bob






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 06-28-2003, 21:34 Post: 58494
jeff r



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 Running a Generator on a 7500

Depends on how big the generator is. Ask mark H how big you can go since the size of the generator depends on how much PTO hp you have. There is a formula for PTO hp and wattage of which I forgot.






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 06-29-2003, 05:21 Post: 58505
TomG

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 Running a Generator on a 7500

One HP approximately equals 750 watts. Most standalone or tractor driven designs provide 2 HP per rated generator KW to allow for peak surges and the engine to work below peak power.

I don't know if the generator is just a generator or also has an engine. The difficulty with running a home generator from a tractor is how it's going to be coupled to the tractor. Most tractor generators have standard 3ph mounts and 540 rpm PTO drive couplings built into them. A generator has to rotate at 3,600 rpm to produce 60-cycle power. Most moderate cost standalone generators run govern their engines to 3,600 rpm but others run lower rpm's but gear the output speeds up to 3,600 rpm.

You'd have to know the input rpm required for the generator but it's unlikely that any tractor has a convenient output of the right speed for a generator unless it was designed for 3ph use. Rigging up gear or pulley systems sounds messy enough to probably justify buying a pto generator or sticking with a standalone.






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 06-29-2003, 06:53 Post: 58508
Rob-Fisher



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 Running a Generator on a 7500

Thanks,the gearing and housing seems to be the stumbling
block from what you are saying,gearing would be 540RPM to 3600 RPM,for 60 Hz. So Would running a PTO tractor stationary to get these RPM's overheat it?
regards Bob






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 06-29-2003, 07:35 Post: 58513
TomG

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 Running a Generator on a 7500

I wouldn't tackle this unless the generator is designed to be driven by a tractor. Tractors are designed for stationary pto use and over-heating shouldn't be a problem as long as a power ratio around 2hp/kw output is maintained. However, many generators have low oil shut downs for long periods of unattended operation, which is something tractors don't have.

This power ratio also would ensure that the most generators couldn't lug the engine during peak loads. RPM's fall off when an engine lugs and AC frequency decreases. Lower frequency increases the current through any AC motors. If the generator mains don't pop, AC motors could burn out. As a quick check, 750W is about 3A at 240V. The tractor should have more pto HP than twice the main breaker size divided by three for a 240V generator.

Getting the speed right could be a problem. Even if the gearing is right, some tractors don't have tachs to set the rpm right on pto speed. I've heard of some people setting the tractor speed by comparing the times of an AC clock running from the generator with that of a battery operated one. Both should have sweep second hands.






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 06-30-2003, 07:37 Post: 58559
Rob-Fisher



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 Running a Generator on a 7500

Thanks TomG, seemed like a good idea for power outages.I've been toying with the idea for a awhile.
From what you are saying standalone generators are the only
way to go.
I think I was remembering many years ago farmers used these
around the farm.
regards Bob






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 07-01-2003, 05:55 Post: 58621
TomG

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 Running a Generator on a 7500

A 6,500W peak, 5,500W continuous standalone is what I have. It can power most everything in the house but not at the same time. I have to do a bunch of load juggling when we're cooking etc. but that's OK for emergency backup.

It is convenient to have emergency power without having to mount a generator on the tractor etc. first. Especially since I'd many times I'd be doing it in the dark or sub-0F temperatures. The cost of decent quality stantalones of the size I have aren't prohibitive. Larger standalones become expensive and tractor mounted ones start having a definite price advantage. Nothing wrong with a 3ph generator and there are some fairly inexpensive small ones. It's just that I don't think of them as very convenient. I also use my standalone back in the bush where it's too far to drive a tractor. The main thing about a 3ph generator is that they already have gearing and couplers to use 540 rpm pto input from the tractor.

If you are thinking about backup power, it probably would be good to think about how it's going to be hooked up and inform yourself about the codes in your area.






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 07-01-2003, 09:23 Post: 58655
AC5ZO

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 Running a Generator on a 7500

Check the papers. There were a lot of standalone generators that were bought for Y2K that are four years old with zero time on them. I expect an ad in the local paper might get some responses.






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