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backup generator
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<blockquote data-quote="greybeard" data-source="post: 1721009" data-attributes="member: 18945"><p>The little generator I have on the front porch is deafening at first. If I ever get another one, it will be a quieter Honda.</p><p></p><p>I would never use a pto driven generator on an older tractor. Many of the older ones didn't have a governor that can meet the demands for clean power in regards to cycles. The voltage regulators can compensate for voltage low/high to a far greater extent than can for cycles, by changing the excitation current but the prime mover's rpm (engine rpm) solely dictates what the cycles (hertz) is. </p><p></p><p>USA cycles is 60 Hz and the standard kept by the power companies is very close. 59.7<em>Hz</em> to 60.3<em>Hz</em> . That is +/- .5%.</p><p>For a motor, like the ones driving refrigerator/freezer/well pumps or compressors it just means the motor will rotate a little slower or faster but for anything with electronics in it (which is almost everything nowadays) a few full hertz can really make a difference and can be very harmful for anything other than a transitory change.</p><p></p><p>A self powered genset uses a constant speed governor that maintains ONE rpm (or tries to) -no matter what the load, that is the rpm the engine runs and the RPM the generator turns. Tractors use a variable speed governor. As load increases on the engine, RPM drops and the tractor's governor attempts to compensate for the load change. This can cause a lot of fluctuation in both cycles and voltage if the load swings are high enough.</p><p>Things like TVs, computers, even 'smart appliances' do not play well with big frequency changes.</p><p></p><p>Modern tractors use electronic fuel injection and fuel control and are much better at maintaining constant pto output rpm. Older tractors, even worn throttle lever to governor linkage can result in variation of up to 5% change in engine rpm.</p></blockquote><p></p>
[QUOTE="greybeard, post: 1721009, member: 18945"] The little generator I have on the front porch is deafening at first. If I ever get another one, it will be a quieter Honda. I would never use a pto driven generator on an older tractor. Many of the older ones didn't have a governor that can meet the demands for clean power in regards to cycles. The voltage regulators can compensate for voltage low/high to a far greater extent than can for cycles, by changing the excitation current but the prime mover's rpm (engine rpm) solely dictates what the cycles (hertz) is. USA cycles is 60 Hz and the standard kept by the power companies is very close. 59.7[I]Hz[/I] to 60.3[I]Hz[/I] . That is +/- .5%. For a motor, like the ones driving refrigerator/freezer/well pumps or compressors it just means the motor will rotate a little slower or faster but for anything with electronics in it (which is almost everything nowadays) a few full hertz can really make a difference and can be very harmful for anything other than a transitory change. A self powered genset uses a constant speed governor that maintains ONE rpm (or tries to) -no matter what the load, that is the rpm the engine runs and the RPM the generator turns. Tractors use a variable speed governor. As load increases on the engine, RPM drops and the tractor's governor attempts to compensate for the load change. This can cause a lot of fluctuation in both cycles and voltage if the load swings are high enough. Things like TVs, computers, even 'smart appliances' do not play well with big frequency changes. Modern tractors use electronic fuel injection and fuel control and are much better at maintaining constant pto output rpm. Older tractors, even worn throttle lever to governor linkage can result in variation of up to 5% change in engine rpm. [/QUOTE]
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