[Different Global incident in coll. plane ratio for different climate sources but almost same GlobHor]

We simulated with NASA and MN for the same location. The global irradiation is almost same but the global incident in coll. plane ratio is very different. What is the reason? Please find ss of pvsyst results.

[Trackers at Different Tilt]

Hres the field orientation.There are +-2 degree differences between tilts of the tracking planes

Orientation

[Trackers at Different Tilt]

I think I have the same problem.

 

Count=94

Orientation parameters
Field type:                              Tracking tilted or horiz. N-S axis

Compatibility between System and Shadings
Full system                             Tracking tilted or horiz. N-S axis
     1 sub-array                      PNom = 4809 kWp,  modules area = 25110 m²
     shading 3D fields              158 Tables,      : , total rough area , . 25872 m²

System parameters
Sub-array #1                         PV Array
PV modules:                            452 strings of 28 modules in series, 12656  total
   Pnom = 380 Wp                 Pnom array = 4809 kWp,  Area = 25110 m²
Inverters  (60.0 kWac)          1 MPPT inputs, Total 4020 k   

Shading scene parameters   
38 fields defined                     Total Area  25872 m²
Field #1: 10 trackers              Tracking field4
Tracker area = 171.7 m²       Total area = 1717 m²
Field #2: 3 trackers                Tracking field4.5
Tracker area = 171.7 m²       Total area = 515.1 m²
Field #3: 6 trackers                Tracking field5.1
Tracker area = 171.7 m²       Total area = 1030 m²
Field #4: 2 trackers                Tracking field6.3
Tracker area = 171.7 m²       Total area = 343.4 m²
Field #5: 8 trackers                Tracking field6.3
Tracker area = 171.7 m²       Total area = 1374 m²

 

The numbers near field is the tilt of each tracker.

Error 1

['Clearness index of the best clear daysis very high' problem]

Hi,

I have a Ktcc value problem. As you see the attachment value is starting from 1.6 . I guess it should be around 1.1 . Attach file is for first half of 2017 and from meteocontrol datalogger. I can not understand why ktcc is very high in my ASCII datas. Could you please give me an advice regarding problem?

Thanks

BR

Onur Gunes

problem screen

[The clearness index problem]

Dear Sir,

I imported ASCII meteo file without success. It says' The clearness index of the best days is very high with respect to the clear day model.' I don't have time shift or location problems.

PVsyst is giving as a solution 'Please check the units or the solarimeter calibration' but I don't know how to do. So could you please help me regarding above problem?

e-mail: onur.gunes@solarian.com.tr

Best Regards

OG