# 1Plasmon

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9

1. ## Totaling daylight hours in PVSyst

Once a meteo file like TMY has been imported into PVsyst, does the program provide an easy tool for sorting the total annual hours of sun above the horizons (let's say 15deg E and W)? Thanks Al
2. ## PVsyst compounded uncertainty

Hello, I would like to know if someone knows how to define a closure formula or the product of the set of key parameters in PVsyst where one could estimate the min and max bound on the output energy? I know there is a generally reported uncertainty on PVsyst of ~ +- 3%. What are the min/max (%) values in PVsyst loss diagram that I can consider against my simulation of any project? The closest closure formula would be like Power output of PVUSA rating. Regards Al
3. ## Inverter sizing factor

Great! Thank you. Since that time I studied some approaches about how to quantify SF (sizing factor) as related to the PV Array STC power. I understand this is an optimization problem that needs to be run for influencing factors like: orientation, irradiance and temperature profiles through the year, assuming one is looking at a specific site.
4. ## Inverter sizing factor

Hello! Let's assume, inverter sizing factor is defined as: Inverter Sizing Factor, Cinv = Array STC power / Inverter AC nominal rating Can anyone tell me how does this factor vary with the POA irradiance and PV array STC size? Thanks A.
5. ## DC losses

Can someone tell me of the assumed 2% losses on the DC side? What is the background to this assumption? I know that once the layout of an array is worked out, the copper losses could be estimated. Thanks, Al.
6. ## Creating an OND file from inverter data sheet

Thank you! I will try that. A.
7. ## Creating an OND file from inverter data sheet

Hello, How can I create an OND file for an inverter that is not listed on Photon D/B or in PVsyst library nor the supplier has it either? Thanks A.