For what it’s worth, Synology Hybrid RAID is just a fancy GUI over linux mdraid, so the drives can be mounted on any Linux system (Synology even have instructions for how to do this on their website). You’ll be SOL mounting them with any kind of third-party NAS GUI that expects their own partition layout though.

What are you powering with it?

You plug it straight into the wall, it syncs to the grid and back-feeds it, up to 800W. Your meter stops spinning (or even goes backwards)

because if the grid went down, these types of panels could keep feeding the house, out to the street, and electrocute a line worker

The inverter in these is designed to shut down if it doesn’t detect a waveform from the grid to sync with - they are unable to create a 50 Hz AC wave on their own. As long as the hardware is legit (which is a big if with how easy it is to get unsafe junk in from China) there is no safety issue, it’s purely regulatory.

Yeah when I went over my bank statements for last year, I only went to an ATM a single time in the whole year. Mostly only need cash for stuff like parking