Is a 50 amp transfer switch a good match for a 17,500-watt generator?

I'm looking to buy the Guardian Ultrasource 17,500 watt generator as a back-up generator for my home. It comes with either a 50 or 60 amp transfer switch (see below). My electrician said that a 50 amp switch is not powerful enough to transfer all 17,500 watts from the generator to the house. He said I would... show more I'm looking to buy the Guardian Ultrasource 17,500 watt generator as a back-up generator for my home. It comes with either a 50 or 60 amp transfer switch (see below). My electrician said that a 50 amp switch is not powerful enough to transfer all 17,500 watts from the generator to the house. He said I would need something closer to 100 amps, and that it would cost about $400 or so.

I don't know much about electricity, but I figure that the manufacturer of a 17,500 watt generator probably wouldn't include a 50 or 60 amp switch, unless their engineers had determined they were a good match for each other.

One last note: The Guardian PDF spec sheet says a "60A Manual Transfer Switch" is included, but the Guardian website says a "50-amp high power outlet" is included.

http://www.guardiangenerators.com/PublicPDFs/UltraSourceSpec.pdf

http://www.guardiangenerators.com/Products/Ultrasource/Ultrasource.aspx


So who's right? My electrician, or the folks at Guardian generators?
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