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If you are going to have two separate circuits is there any reason why one of them couldn't be low voltage DC?
A lot of the things we use electricity for already drop the AC mains voltage down to either 12V or 5V DC. PC's run off 12V DC (with an internal voltage regulator) phones and 'i' devices charge at 5V, some of the less expensive TV's run off 12V with a regulator in the power cord.
That would make it safe to DIY and make it clear which devices were running off the PV cells. It would require distinctly different wall sockets so as to avoid confusion and plugging in a 12V device into 110AC.
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