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Why Balcony Solar Panels Haven’t Taken Off in the US
(www.wired.com)
This is a most excellent place for technology news and articles.
What? America has one of the most unsafe electrical systems in the world. You might as well just stick two unshielded wires out of the wall and be done with it, it would actually be more convenient about the same level of safety.
As for crossing the phases, yes you can do that but how many outlets are actually set up like that, you certainly won't find an outlook configured like that in a bedroom. Each household probably only has one or two 240 volt outlets.