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The biggest reason to buy rather than build is for the safet of prople working on the lines. You really don't want to be responsible for electrocuting someone who had every reason to believe the wire was not energised. Comnercial devices ensure that when the grid goes down you stop trying to pump power into it -- and if they fail to do so, the liability is ...


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You are right, that contractor doesn't know what he is talking about. Most inverters will produce power at low wattages as long as the Vmp of the string (maximum power voltage) doesn't fall below the spec in the data sheet for the inverter. Most inverters are actually more efficient when operated below full load. For example the Sunny boy 11000TL-US will has ...



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