Frequently Asked Questions: General

  • Normally PV*SOL and T*SOL adopt the settings of the currency symbol from the Windows 7 settings. But in some cases it doesn't.

     Please try the following:

    1. Close PV*SOL/T*SOL.
    2. Go to “Control Panel” => “Region and Language” and change the language to any other location with different settings.
    3. Start PV*SOL/T*SOL and try if the new symbol is adopted. Afterwards close the program and go back to the “Control panel”.
    4. Change back to your standard language.
    5. Start the program and try if everything works fine.

  • The program needs a relative constant and stable internet connection. If this is not guaranteed, then the program aborts the download of data.

    Alternatively you can also try to download the latest program version from the download section of our webpage:

    Please execute the downloaded setup file. The old program version doesn't need to be uninstalled.

  • Our software is developed to run on Windows operating systems. Additional software is required, such as VMWare or VirtualPC, in order to use our programs on a Mac or with Linux.

    Please note that Valentin Software can't provide support for Mac or Linux installations.

  • No, but you have to make sure that the new version is installed into its own separate folder.

  • To display the help the Windows program WinHlp32.exe is required (Download: Windows Vista, Windows 7). Please follow the instructions from Microsoft.

  • The wPDF200A.dll file is required in order to create the Project Report in PDF format. The file is a part of Microsoft Windows Systems. Please copy the wPDF200A.dll file via the following link: and paste it into C:\WINDOWS\system32 or C:\WINNT\system32, depending on your Windows System.

  • The unit of currency in the program depends on the system settings of your operating system and can be changed in the Regional and Language Options of the Control Panel.

  • In the demo version you can view all the program components and features, but do not save or print. For the simulation only sample data and a limited number of climate records are available. You can use the manual and program help to obtain an overview of the content and capabilities of the program.

    GeoT*SOL 2.0 can be used as full version for 30 days. The project report is marked with trial.

    Free demo versions of our software are available in our download section.

  • The word “correct” cannot really be used in respect of climate data in this context. Climate data usually comes from different sources, can be determined by different measurement methods and can be collated from different average values or even different periods of time. Different algorithms can be used to generate the hourly values from monthly values. Climate data will therefore usually never be similar. The climate data for Germany comes from Deutscher Wetterdienst – DWD (German Weather Service). For the program versions up to PV*SOL express 3.0, PV*SOL Pro 4.5, PV*SOL Expert 5.0, T*SOL Expert 4.5 und T*SOL Pro 5.0 average values over a period of 20 years during 1981-2000 are used. The new program versions uses the new 30 year mean (1981-2010) for the German locations. All other locations outside of Germany are based on Meteonorm 6.1 data with mean data of 1981-2000. The service tool on our website, on the other hand, creates hourly values based on PVGIS data (other source, other periods) using the algorithms from PVGIS.

    If you create own climate data sets using MeteoSyn (starting PV*SOL Pro 4.5, PV*SOL Expert 5.0 and TSOL Pro 5.0) the algorithms and data of Meteonorm are used.

  • Please check if the climate data files are located in the directory which is set under Options > Paths > Climate Data.

    Usually the climate data are installed in the following directory.

    For climate data until PV*SOL Pro 4.0, PV*SOL Expert 4.5, T*SOL Pro 4.5, T*SOL Expert 4.5 and T*SOL express apply following:

    - Windows XP / 2000: C:\Documents and Settings\All Users\Application Data\Valentin EnergieSoftware\Meteo

    - Windows Vista / Windows 7 / Windows 8: C:\Program Data\Valentin EnergieSoftware\Meteo

    - Please note that  if you are using PV*SOL express you have to install an additonal climate data package

    For climate data of the versions PV*SOL Pro 4.5, PV*SOL Expert 5.0 and T*SOL Pro 5.0 apply following:

    - Windows XP / 2000: C:\Documents and Settings\All Users\Application Data\Valentin EnergieSoftware\MeteoFiles

    - Windows Vista / Windows 7 / Windows 8: C:\Program Data\Valentin EnergieSoftware\MeteoFiles

    Higher program versions use the following directory:

    - Windows XP / 2000: C:\Documents and Settings\All Users\Application Data\Valentin EnergieSoftware\MeteoSyn

    - Windows Vista / Windows 7 / Windows 8: C:\Program Data\Valentin EnergieSoftware\MeteoSyn

    If you are using a different directory please adjust the path accordingly.

  • To determine which Windows 7 edition you are using please open the system information window of your computer by pressing the “Windows” and the “Pause/Break” button simultaneously. In the “Windows edition” section your Windows 7 edition is shown.

    If you are using an edition of Windows 7 without compatibility mode MeteoSyn will not work.

    Otherwise you have the possibility to run our programs in the compatibility mode:

    Click with the right mouse button on the program icon on the desktop and choose “Properties”. In the properties window choose the tab “Compatibility”. Enable “Run this program in compatibility mode for:” and choose “Windows XP (Service Pack 3)” in the drop down menu below. Leave the “Properties” window by pressing the “OK” button. On every program start a new information message appears.

    Please note: In some cases it is possible that MetoSyn will not work under Windows 7 even if the compatibility mode is activated.

  • If your climate data is available in hourly format (i.e. 8760 values each for temperature, global radiation, wind and relative humidity) you can read these into our programs by saving the data as an ASCII file, separating the data with a TAB and using the extention *.dat.

    The first lines (the file header) should look like this: 




    1st line: Name of location


    2nd line: latitude, longitude, altitude, time relative to Greenwich,-30 should be included at the end.  

    The decimals for latitude and longitude must be specified in minutes, eg Vienna 48.1866 ° => input 48.11. When entering longitude and time negative signs must be used for locations of eastern longitudes. Positive latitudes corresponds to the northern hemisphere.


    3rd line: empty line

    Ta Gh FF RH

    4th line: should be as shown; separated by a TAB

    The following lines of data come next:



    -5.0 0 1.8 75.5
    -5.4 0 1.5 78.0

    5th to 8764th lines: external temperature – global radiation onto the horizontal/m² - wind speed - relative humidity; separated by a TAB.

    Please note that missing data has to be filled up with "0".

    In PV*SOL Pro 4.5, PV*SOL Expert 5.0 and T*SOL Pro 5.0 you are not able to import your own climate data.

  • Yes, You can import the desired logo  under Options - User Data in the menu bar. The file formats *.gif, *.bmp, *.png, or *.jpg can be used.

    However, in T*SOL and older programs, you can only use logos in the file type Bitmap (* bmp).

  • Yes, you can load horizon files in the shade window by using the import function. Our software is compatible with the systems Horicatcher (Meteotest, Schweiz), Horizon (Energiebüro AG, Schweiz) and SunEye (Solmetric, USA).

  • This error occurs if an older Microsoft SQL Server Compact 3.5 version is installed on a Windows 7 64bit computer.

    Please install the service pack 2 of the SQL Server Compact:


    The download contains two files. One for a 32bit and one for 64bit system. In case of a 64bit operating system both files have to be installed.

    Please note: You have to do it in the right order!

    • First install

    SSCERuntime_x86-ENU.msi (32bit)

    • and afterwards

    SSCERuntime_x64-ENU.msi (64bit)


  • This error occurs if there is unused virtual space left, like e.g. usb devices, and the drive letter is no longer existent. These drive letters have to be deleted. Please proceed as following:

    - Right click on “My Computer” and choose “Manage”
    - In the window that opens up, choose "Disk Management" and delete the unused drive letters


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