27KW Genset has slight flicker with incandescent lamps
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Because a 3600 RPM alternator only has two poles. Your power company's alternator has something in the 32 to 36 pole range. A two pole alternator can't create a sine wave. It looks like a triangle wave with the top flattened.
Here is what my old 7 kW generator looked like.
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1800 RPM has 4 poles respectively. Generators just have a 'noisy' sinewave in general. Things like brushed vs brushless can add to it, connected loads, engine stability, etc.
Generac tech for over 12 years. I'm here to help!
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"The only source of knowledge is experience" -Albert Einstein
Looking for Generac parts? Gentek Power offers the full line of Generac replacement parts! Shop Gentek Power Generac Parts
A list of my favorite Generator & Electrical Tools! https://www.amazon.com/shop/gentek_power