Thanks for the help y'all. They are suggesting to install this panel https://www.homedepot.com/p/Reliance-Controls-10-Circuit-30-Amp-Manual-Transfer-Switch-Kit-310CRK/205793178.
Which looks to me like it doesn't switch the neutral so wouldn't work with the lightning?
I got a quote from an electrician to add a sub panel with transfer switch to use the lightning as a backup power source.
I've done a ton of reading on the forums and know most people use the generac panel for this.
They have quoted a Reliance transfer switch. I asked a lot about the setup...