AVR generator

Is there a difference between a avr that cost $20 and one that cost $90 . Why would a company put a expensive part that cost 1/4 the cost of a generator this is for a portable gen 5000 watt.
 
A cheap one will be a plain Jane regulator. No protection on it. If the generator shuts down under load. The regulator will ramp up trying to keep the
voltage up.Burning up the regulator.

The high dollar one has safeties built into it. If the generator shuts down under load. Once it drops below 55 hertz on most. The system will shut the
regulator down to protect it.Normal range is 57/63 hertz.
 
If the generator has brushes. It is a good idea to run it once a month to keep the film off of the slip rings. On some the film builds up causing the
regulator to work harder burning up Onan has this problem on the newer units. But they are not the only ones.
 

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