>> You are rarely space or weight limited Yes and no. In a commercial context, with installation at ground level, space isn't an issue. On commercial building

>> You are rarely space or weight limited Yes and no. In a commercial context, with installation at ground level, space isn't an issue. On commercial buildings, again roof space is often plentiful, and not an issue. But for residential, with pitched roofs, often pitched it the wrong direction, space is a major factor. Alas residentials are also the most price-sensitive. And this is before we discuss the assumption that US panels would be "better". In truth they are likely to be less effecient, not more effecient. Chinese factories spen a lot on updating equipment and processes. By contrast most US industries don't spend a lot upgrading factories - especially in the short term.