A distinction was made:

> the transfer switch variety switches your house between the inverter and the grid whereas the disconnect just physically disconnects the inverters output

Thanks, and I agree that a DIY-inverter designer should be able to meet grid-interconnection requirements (e.g. IEEE 1547-2018). With that said, I think case-by-base evaluation from the AHJ would be prudent without a UL listing... something that AHJs don't want to do.

I'd prefer to just put the DIY inverter behind a transfer switch (with an adequate battery bank and maybe a small propane generator)... with the grid as emergency fallback.

> Why the fearmongering?

The main concern is exporting to a downed grid that line-workers are trying to restore.

Not that this is accepted by insurers or AHJs ("authorities having jurisdiction"), but one can use UL-certified components in an (open-source) _assembly_ that itself isn't UL certified. This at least supports the argument that the overall product is safe if thoughtfully designed and assembled. An example is the OpenEVSE level-2 car charger (which I had a really good experience with).

The creator of OpenClaw, for example, has come to appreciate grammatical / spelling errors in human writing (as he said in a recent Lex Fridman interview).