Attached is a graph that I was shown when people said that oversizing an inverter was a smart thing to do. The more I think about it, I think that the graph is outdated and doesn't give any benefits to the newer generation of more efficient inverters. If I had to recommend a system to someone after all the clipping I have experienced, I would say don't go over 1.1 DC:AC ratio. Here is my justification. The link will take you to a graph of the efficiency testing of a SolarEdge 7600 http://www.gosolarcalifornia.ca.gov/...US%20(240).pdf
As you can see from the graph it is very efficient even at 10%. The ramp up times and the energy you would gain from it would be minimal, if any. You can even argue you would lose energy because at higher loads the inverter actually loses efficiency. Can anyone give me a good reason for oversizing an inverter, besides the cost of the inverter and possible costs to modify the panel? The graph below is complete nonsense for current systems and people make it seem you are getting a better return by clipping. After seeing the efficiency graphs of new inverters I would never suggest anyone to oversize an inverter for any reason.
As you can see from the graph it is very efficient even at 10%. The ramp up times and the energy you would gain from it would be minimal, if any. You can even argue you would lose energy because at higher loads the inverter actually loses efficiency. Can anyone give me a good reason for oversizing an inverter, besides the cost of the inverter and possible costs to modify the panel? The graph below is complete nonsense for current systems and people make it seem you are getting a better return by clipping. After seeing the efficiency graphs of new inverters I would never suggest anyone to oversize an inverter for any reason.
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