Our portable generator is 12.5kw and i have a electrical cord I made that hooks up from genset 220 to dryer plug outlet in the garage. Feeds the house and absorbs the surges from hvac, fridge etc just fine. Its a diesel genset so in an emergency I can feed it from the bed tanks on my diesel trucks if we run short of fuel if outrage is long term.
“...electrical cord I made...”
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From your description that sounds like the cord
I made for hooking up my Christmas lights one year.
Is it a male plug on both ends?
It worked, but it scared hell out of me just to look at it.
I cut it up into pieces and threw it out after one season!