Getting irradproc to run, or, best workflow for using pv6parmod?

I'd like to use the pv6parmod module to do some script-based parametric analysis of PV module performance, and I am trying to figure out the best workflow for this. Based on the variable names in the various modules, the logical order seems to be:

1. wfreader
2. irradproc
3. pv6parmod

However, I've not been able to get this workflow to work for me; the irradproc module is failing. Here's my sample code:

/** Configuration **/
// Clear all variables
clear();

// Weather file
var('file_name', 'C:/SAM/2015.1.30/solar_resource/USA CO Denver Centennial [golden - Nrel] (TMY3).csv');

// Model configuration
var('irrad_mode', 0);
var('sky_model', 2);
//var('albedo_const', 0.2);

// Array Configuration
var('track_mode', 0);
var('azimuth', 180);
var('tilt', 10);

/** Calculate POA Irradiance **/
// Read weather data then calculate POA irradiance
run('wfreader');
run('irradproc'); // Fails... why?

Using this, I get the rather cryptic error:

Error: check fail: reason unassigned referenced, with 'irrad_mode!' for: beam time -1.000000
EXEC_FAIL: irradproc

This sounds like an unassigned variable, but the error doesn't say which one, and as far as I can tell all the required variables for irradproc are assigned in the data container. What I am missing?

(Note: I'm testing this with SDKtool on Windows, 64-bit, SDK release 2015-1-30).

Alternative question: is there a better workflow for getting the required irradiance inputs for pv6parmod?

EDIT: I just saw that SAM 2015-06-30 is out, so I downloaded and tried it as well. Same error.

Right; I have checked through the list. I set 'irrad_mode' and 'sky_model' (even though they have defaults) as well as 'track_mode', 'azimuth', and 'tilt'. It appears that everything else either (a) has a default, (b) is an output from wfreader, or (c) is not required for the set inputs I specified. However, I still get the error.

Also, I would upload the script, but apparently the .lk extension is not a permitted file type for upload. Here is my updated test script. Note that I tried putting in values for the optional 'gcr' and 'albedo_const' variables with no change in error message.

/** Configuration **/
// Clear all variables
clear();

// Weather file
var('file_name', 'C:/SAM/2015.6.30/solar_resource/USA CO Denver Centennial [golden - Nrel] (TMY3).csv');

// Model configuration
var('irrad_mode', 0);
var('sky_model', 2);
//var('albedo_const', 0.2);

// Array Configuration
var('track_mode', 0);
var('azimuth', 180);
var('tilt', 10);
//var('gcr', 0.50259);

/** Calculate POA Irradiance **/
// Read weather data then calculate POA irradiance
run('wfreader');
run('irradproc'); // Fails... why?

Hi Steve,

You've helped identify a parsing bug in SAM that has now been fixed. For the time being, please use the following modification and your script should run. Note, I believe you also need to define 'gcr':

var('irrad_mode!', 0);

Thanks,
Nick DiOrio

That worked; thanks!