Not near true, about gensets. The reason why many run so fast is because it is the cheapest way to build. That is, running a smaller engine near it's max.
The most pricey and fuel efficient standby gensets run very slow, at 1100 or 1300 RPM. The cheaper ones buy cheaper engines and run that at their near max.
HD Delco gensets with Detroit Diesels run at 1100 RPM. Newer four-sroke diesels powered by Cummins, Isuzu, etc. tend to run 1800 RPM.
The most efficient smaller portable gensets run even slower and match RPM to load. That is done by making DC instead of AC, running it through a full wave inverter to make AC at 60 cycles at any engine RPM.
I don't believe you're going to find test specs anywhere on any diesel engine the runs most efficient when out of it's peak torque-curve. And with most - that is 1800-2200 RPM.
A small cheap engine can be made to behave like one twice it's size - simply by runnig twice as fast. That's the cheap-way out for lower priced gensets.
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Today's Featured Article - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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