iMeshbean® 500w watt MPPT Solar Grid Tie Power Inverter Converter 10.8-30V DC 110VAC
I have this hooked up to one single Mitsubishi 250Watt panel (31v / 8amps).  I am getting about 175Watts at the 110v AC outlet - which is about 70% efficiency.  I assume the panels are not always outputting 250Watts, so the efficiency rating might be a bit higher.  Not bad at all.<br /><br />I have the same panel hooked up to a Power Jack 1200W - was not able to get more then 140Watts at the 110V AC outlet (only about 56% efficient).<br /><br />Anyway, I'll be getting a few more of these for my other panels