I have a Growatt 5000 and their Autotransformer. I am wanting to power 120v circuits from my main panel via a Pro-Tran xfer switch. Not planning on powering 240v at this time. With the autotransformer, I have a neutral, L1, L2 coming from a “inverter/generator” breaker panel that I would connect to the Pro-Tran. My question is the neutral line from the autotransformer. Does that go to the neutral in the pro-Tran and then the Pro-Tran neutral goes to the main panel neutral bus bar? Or do I “float” the neutral since the circuits of the Pro-Tran are still bonded to the neutral at the main even when they are powered by the “generator” side? Thank you!