[dlcarrier]

If they could prohibit internet communications and allow LAN communications, that would be great.

Also, it should apply regardless of where they are manufactured. It's far more likely for an attack to happen through a compromised centralized server, or a worm compromising embedded servers en masse, than it is for an authority to directly petition an attack.

Also, my inverter wasn't manufactured in China, but the Wi-Fi module was made by Shanghai MXCHIP Information Technology Co., so it's no less vulnerable.