True, but I guess if we are going to desscribe "gensets" and engineering, the discussion has to be narrowed a bit. Yes, a smaller engine running fast (often air-cooled), that makes imperfect AC power, makes a unit much easier to haul around. It's a compromise, but as I've maintained - the fast running engine has nothing to do with making better AC power.
There's a big difference in the purpose and engineering between "portable" or "jobsite" gensets, as compared to little used "home backup gensets", compared to constant duty gensets designed to work a lot and make near perfect AC power.
Portable AC gensets rarely make correct AC power, but yes - are handy and easy to move around. They also tend not to be very efficient. Imperfect AC power rarely matters with power tools and not-electronic chip-controlled appliances. On the other hand, the more pricey portable DC to AC gensets are pretty efficient (often called Inverter series). Note they also run very slow much of the time.
Standyby gensets primarily designed for home backup come in many flavors, but many are cheap crap NOT designed to be used constant duty. In fact, many void the warranty if they catch you hooking one up to a house that lacks grid power. Read the small print in their warrantees.
The most expensive, slow-running, constant duty gensets that replicate grid AC power are the most expensive, and the most efficient have the slowest running engines.
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