[RE-wrenches] DC to AC derate

[All Solar, Inc.]

Wrenches,
Once again I am trying to size a grid tie w/battery system and I struggle a little with the efficiencies of them.
With PV Watts (v.1), is changing the DC to AC derate an accurate method for getting the output?

Thanks in advance!

Jeremy
  
All Solar Inc.
Jeremy and Amy Rodriguez
1463 M St
Penrose, CO 81240
www.asolarelectric.com
Phone 719-372-3808
Fax 719-372-3804
Email allsolar at scswifi.net
Email allsolar at live.com
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