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Discussion Forum

Re: Emergency Power Generator

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Errin OH

02-13-2003 08:13:27

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A couple things to think about, 20hp @3600 rpm is the requirement to run it at full power (7200w). As for your setup, ie. 7 to one or 3 to 1, the hp requirements will change. Because you are stepping up, with 7 to 1 you need something like 140hp PTO hp to produce 7200w (60hp at 3 to 1). Likewise I would figure 20hp stepped up 7-1 would only produce something like 1000w before the tractor stalls. 20hp/7=3hp at gen, (6hp @ 3-1 ratio) figuring (7200w/20hp=360w per hp) You would be looken at 1080w and 2100w respectively. I am sure these are not exact figures and it does not mean it won't work. But if you are want 7200w you need the hp to get it (ie.. PTO hp x step up or an gen that will work at lower rpms). Regulation is another story and as stated in previous post, could be a real problem if your gov is not up to snuff. A miller 225 welder fit my needs just right at 7500w. But it has its own 20 hp twine cyl engine and internal reg. Good luck.

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02-13-2003 22:22:36

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 Re: Re: Emergency Power Generator in reply to Errin OH, 02-13-2003 08:13:27  
I remember Farmall advertising of the Electrall in the late 50s, showing it powering a baler with an electric motor. Obviously, it never caught on, so THAT point is moot. In regard to pto alternators, since about 1977 I've had a 25/45 kw alternator which is capable of starting at least a 10hp electric motor. 25kw is the normal operating load, 45kw is the starting max. With a D17 gas I can run it, but the tractor is not responsive enough to maintain an even flow of power at a steady voltage, full power. The 3020 diesel or larger tractors hardly notice when starting additional motors, and maintain an even level of voltage. The gas tractor was fine for winter outages overnight, keeping the house warm and dairy barn operating, but for milking (10hp vacuum pump, lights, fans, etc.) the 3020 was a better match. Milk cooling and feeding motor usage was staggered because total power could approach 35hp. I would caution purchase of a power unit from Harbor Freight- used 10-15kw pto alternators are cheap. NEVER use without the double-throw switch at the power pole. Our REA will disconnect any customer without that lineman protection. And belt drive would be a mickey-mouse creation.

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02-13-2003 09:32:04

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 Re: Re: Emergency Power Generator in reply to Errin OH, 02-13-2003 08:13:27  
Sorry Errin, but you are wrong, wrong, wrong. Please consider where the rest of the power would be going! 100HP is equivalent to 75 kW!
Regards, RAB

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