What's wrong with 2/0 feeding a 200A panel? Isn't it rated for 200 amps in residential? I believe you can even downsize the neutral to a 1/0.
As far as the generator. That house probably only pulls 50 amps with the A/C on and the stove going. As long as it's 12kw or more it should be alright.
Although it's not part of the OP's question... Ya those control wires need their own pipe. Even if they're high voltage, now you have to derate your gen. feeders 70% per 310.16
As far as the generator. That house probably only pulls 50 amps with the A/C on and the stove going. As long as it's 12kw or more it should be alright.
Although it's not part of the OP's question... Ya those control wires need their own pipe. Even if they're high voltage, now you have to derate your gen. feeders 70% per 310.16