Greg has pointed out another problem endemic to the solar industry: manufacturers vanishing. This would be a natural part of business development - how many car makers have disappeared? - but it's made much worse with the government raising hopes and expectations.
The governmental involvement also gives a major steroid shot to the scam artists. "Solyndra" is perhaps the best know such scam.
"Micros" are listed in both 120v and 240v designs. I am not aware of any LISTED units having simple plugs - they have to be wired to a dedicated breaker for back feeding. At least, that's what the instructions say!
I have no way of knowing how these units- or any other listed solar system- will interact with UPS systems, or other generation systems.
