Plugs and sockets have the wrong gender for this. On the battery, you'd have a male plug with live 240v contacts, ready to short against anything, or anyone, that's conductive. This is the same reason why male-to-male extension cords are labeled "suicide cords".
Well, yes generally speaking. But the way this works with these plug in panels is that the micro inverter won't actually start delivering power to the grid in the absence of an energised plug in the first place. So just sitting there, the contacts are completely harmless. Obviously actual physical safety where you literally can't touch the contacts would be better.
They need the grid frequency to generate AC. Those inverters are only allowed to be grid-following (at least for the plug-in part. I think there are systems that provide a -to-load socket that can be a PSU)
To know that 0.32 m is smaller than 43 cm I have to actively think, but I'm guessing you don't. I've never had to think about 3/4 vs 1/2. Even 5/16ths vs 1/4 is intuitive for me.
When we use fractions for measurements, the denominator is virtually always a power of two. The only one I can think of that isn't is a fifth of alcohol, which is really just its own unit at this point.
Neither 1/36th or 1/12th are used, and the other two aren't fractions. We don't say six and a twelfth feet, we say six feet one inch. With distance, fractions are only used for fractions of an inch (apart from trivial uses like "one and a half miles").
Nah, ditch the wife. Become a cardinal in the Catholic church, then get elected pope. From there it should be fairly trivial to re-establish the Papal States to their largest extent.
Search engines are supposed to help you find things without requiring you to already know with perfect accuracy what you wanted to find before making the query.