Re: Re: Emergency Power Generator

Posted by RAB on February 13, 2003 at 09:26:51 from (195.93.49.179):

In Reply to: Re: Emergency Power Generator posted by john on February 13, 2003 at 07:48:07:

Meant to be a reply to the top post, but slipped a bit...
A few things to consider.
The pto output is designed for axial load and may not like too much radial load.
The belt drive shaft is designed for radial load and may not take kindly if you were to drive an axial load (which I doubt you are contemplating).
On a resistive calculation about 13HP is sufficient to generate 7.2kw and if you are going to run your engine at, or near to, normal pto speed, then I would not think there would be a great deal of voltage/frequency variation using a normal tractor variable speed governor - you just need to set it at, say, minus 2to 3% at full load and check that at off-load it only gives 1 to 2% over target voltage/frequency and that your governor doesn't continually 'hunt'
The important addition may be a frequency counter to set it up. Many fairly cheap digital multimeters have this facility - but use a reduction transformer (12?volt output) if you intend using these.
Most gearbox or belt and pulley suppliers will be able to tell you how much either system will lose in transmitting the power to the generator.
Don't forget to install guards, circuit breakers, change-over switches (if there is ANY possibility you might connect it to the mains circuits)etc. - be safe.
The suppliers of tractor-driven generators may sell you a suitable system already built for three point hitch costing not much more than you will put into a good system.
Regards, RAB

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