Question-and-Answer Resource for the Building Energy Modeling Community

ElectricLoadCenter:Inverter:LookUpTable Night Tare Loss Power

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

Tess
51 ●1 ●6

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

__AmirRoth__

4436 ●5 ●17 http://bleedinggreenna...

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 http://www.gosolarcalifornia.org/equi.... 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

edit retag flag offensive close merge delete

add a comment

1 Answer

Sort by » oldest newest most voted

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

Julien Marrec

29042 ●85 ●74 http://www.effibem.com/

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.

edit flag offensive delete link

add a comment

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account.

Add Answer

Careers

Question Tools

1 follower

Stats

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

Seen: 2,971 times

Last updated: Oct 11 '17

Site design and logo: Copyright © 2015 Big Ladder Software LLC. All rights reserved.
The Unmet Hours and Big Ladder names and logos are trademarks of Big Ladder Software LLC.
User contributions licensed under the Creative Commons Attribution Share Alike 3.0 License.

ElectricLoadCenter:Inverter:LookUpTable Night Tare Loss Power edit