You can make a cheap grid interactive (not grid tie) inverter out of an old rackmount UPS (must be an old double conversion type and not a newer high rail or delta conversion type). Simply connect the solar panels to the battery through a charge controller and plug the loads into the UPS. The loads will have battery backup and will be powered off the solar when it it available, off the grid otherwise. Excess solar power would be wasted so have a controller bring extra loads online under that condition.
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To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...
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