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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.
No, it's electrical code. Standard outlets can't be used to supply power because it means you have a plug that has exposed wires commonly called suicide wires. While these balconey top solar likely use grid following so it has to detect a grid voltage, the electrical code doesn't consider it AFAIK. This rule is for safety and because it would only power half your house because there's only one leg per 110 outlet.