[JCL3]

I would say the $4,000 Winco HPS12000HE Tri-Fuel Generator puts you a little over the $200 budget :)
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Plus a transfer switch, installation of that, etc.
We got a used 3950 watt Champion for $150 that got us through Harvey and other glitches. Last year we got a new one($400), very similar that uses the same twist lock 240 vac splitter cable.

[Elsie]

https://www.google.com/search?q=generator+switchover+schematic&rlz=1C1AVNC_enUS560US607&oq=generator+switchover+schematic&aqs=chrome..69i57.9518j0j4&sourceid=chrome&ie=UTF-8