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ElectricLoadCenter:Inverter:LookUpTable Night Tare Loss Power

asked 2017-10-05 09:53:30 -0500

Tess's avatar

updated 2017-10-05 10:42:36 -0500

In the field "Night Tare Loss Power" in EnergyPlus you can fill in the energy that the inverter is using during standby. ElectricLoadCenter:Inverter:LookUpTable was designed for use with data contained in the Inverter Performance Test Summaries available at The Night Tare Loss Power in this document is 0.02 W. But in the InputOutputReference I see in the example that there is 200 W filled in for the Night Tare Loss.

Is it true that they assume that the inverter is standby 100 hours a year? So that makes the Night Tare Loss Power = 0.02 W x 100 hour = 200 W

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answered 2017-10-11 03:27:09 -0500

No, I don't think that is true. And as far as I can tell, the I/O reference just gives you an example, very generically named "PV Inverter", and not the specific model you are giving us a link to the documentation. You'll note the efficiency at various power and nominal voltages also doesn't match your specific model.

Because you shouldn't take my word for it, here's something to back up my claim.

  • The Night Tare Loss is read in DCtoACInverter constructor here into the variable standbyPower_. In no case this variable is being changed to account for 100 hours or whatever.
  • Then you want to look at DCtoACInverter::simulate, here and here, where you'll see it is used as is.

So I think in your specific inverter, Night Tare Loss Power should be 0.02W.

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Asked: 2017-10-05 09:53:30 -0500

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Last updated: Oct 11 '17