SolarEdge inverter single-phase with commercial ...

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Zee said:

What is the energy lost if I design a 2.64 kW system with a 6 kW inverter (SMA 6.0)?
My vague memory is the inverter - when under-loaded - performs low on the efficiency curve......
As opposed to a 3.8 kW.

Want to make it easy to add kW later for customer.

Click to expand...

That's a question for the inverter manufacturer. I have seen efficiency vs DC loading curves for inverters and they are fairly flat until you get down to a rolloff point, and my gut feeling is that loading it only 50% is on the flat(ish) part of the curve, but you'd have to get the info for the specific inverter to be sure.

Edit: If you look at the data sheet for that line of inverters there is a plot of what you are looking for. If I am reading it correctly, it says that for 50% DC loading the efficiency is actually a little higher than for 100% loading.

That's a question for the inverter manufacturer. I have seen efficiency vs DC loading curves for inverters and they are fairly flat until you get down to a rolloff point, and my gut feeling is that loading it only 50% is on the flat(ish) part of the curve, but you'd have to get the info for the specific inverter to be sure.Edit: If you look at the data sheet for that line of inverters there is a plot of what you are looking for. If I am reading it correctly, it says that for 50% DC loading the efficiency is actually a little higher than for 100% loading.

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