Perhaps I wasn't clear - when I say "Sometimes more!" I mean many cheap chinese inverters actually support four options:
1. Cloud management with their app.
2. Wifi management without the cloud (when you're on your home wifi).
3. Unplug the wifi dongle from the inverter for a fully offline system. You don't really need your inverter on the internet anyway.
4. Unplug the wifi dongle and DIY whatever you want, the dongle's just a serial-to-wifi converter.
That's not to say the security of any of this stuff is good, of course. In fact the security is pretty bad! But you can for sure get inverters with multiple options for non-cloud operation.
1. Cloud management with their app.
2. Wifi management without the cloud (when you're on your home wifi).
3. Unplug the wifi dongle from the inverter for a fully offline system. You don't really need your inverter on the internet anyway.
4. Unplug the wifi dongle and DIY whatever you want, the dongle's just a serial-to-wifi converter.
That's not to say the security of any of this stuff is good, of course. In fact the security is pretty bad! But you can for sure get inverters with multiple options for non-cloud operation.