Ewen, By default, TRNSYS (v17) allows 2000 equations. I believe that TRNSYS 16 allowed 1000. However, the error you are getting is not that there are too many equations/constants but that there are too many operators in your equations! That is not an error I have ever gotten! Impressive! The two are related; the number of allowable operators is set as a function of the number of allowable equations. Your distributor should be able to provide you with a TRNDll that is compiled to allow more equations but I would appreciate it if you would be willing to send me the input file that generates the error so that I can have a look as well. Best, David On 1/16/2012 06:14, ewen raballand wrote: Dear Trnsys users, -- *************************** David BRADLEY Principal Thermal Energy Systems Specialists, LLC 22 North Carroll Street - suite 370 Madison, WI 53703 USA P:+1.608.274.2577 F:+1.608.278.1475 d.bradley@tess-inc.com http://www.tess-inc.com http://www.trnsys.com |