Zahra

Hello André, Thanks for your response. I have a question regarding user consumption. The EcoFlow has an option to set thresholds for the battery to start charging and discharging (e.g., discharge when the battery reaches 80% of its capacity and recharge at 20%). Is it possible to model this behavior in PVsyst? I understand that consumption can be modeled on an hourly basis, but is there a way to represent it based on these charging thresholds instead? Also, please correct me if I am wrong, but I thought that if I don’t want to calculate battery sizing, it might be more appropriate to model my setup as grid-connected rather than standalone (since I am working with a fixed EcoFlow unit). Best regards, Zahra

Hello André, Thank you for your response. As I mentioned, I used an EcoFlow unit in my setup, which includes both an inverter and a battery. I am planning to add a heater as the load. For clarification, do you think it is appropriate to model this system as grid-connected, even though it is not physically connected to the grid? Also, since the EcoFlow integrates the inverter and battery, what would be the recommended approach for modeling it? If it is OK to represent them as separate components, I would appreciate your guidance on the key technical parameters needed for an accurate simulation. Best regards, Zahra

Hello, I am seeking clarification on the module ageing and mismatch loss parameters in PVsyst. Isc and Voc Dispersion: The model uses "Isc dispersion RMS" and "Voc dispersion RMS" as inputs. Are these values the same as the standard ISC and VOC found on a module's datasheet, or are they different parameters representing manufacturing variations? Where can I typically find these dispersion values for a specific module? Degradation Weighting: The default setting often shows a split (e.g., 80/20) for how degradation is attributed to different loss categories. Could you explain the significance of this weighting and how it influences the simulation results? Mismatch with a Single Module: If my system consists of only a single PV panel, do I still need to model mismatch losses (the one in the ageing tab), and if so, why? What is the technical justification for this in PVsyst's simulation? Types of Mismatch Loss: How does the "mismatch loss" calculated within the ageing model differ from the "mismatch losses" specified in the separate Mismatch tab of the software? Global and Mismatch Factors: How does PVsyst calculate the "Individual PV module: Global degradation factor" and "Mismatch degradation factor" based on the number of simulation years? Is this calculation based on a predefined formula, or is it a result of the Monte Carlo simulation itself? Thank you for your detailed guidance on these topics.

Hello, I am conducting an experimental study on the degradation of a Building-Integrated Photovoltaic (BIPV) system, which uses a single semitransparent Photovoltaic (STPV) module on a facade at a 90-degree tilt connected to an EcoFlow portable power station that functions as both the inverter and battery. I am seeking guidance on the most accurate way to model this setup in PVsyst, as I have several questions. Wiring Losses: For a BIPV system with a single PV module connected to an inverter with a 3-meter wire, is it more accurate to model the wiring losses in PVsyst as global wiring resistance or as a loss fraction at STC? Module Losses: I was also wondering how to obtain information for Light-Induced Degradation (LID), module quality, and module mismatch losses. Are these parameters typically provided in the module's datasheet, or are they found in specific research papers? Thank you in advance for your guidance.

Hello, I am conducting an experimental study on the degradation of a Building-Integrated Photovoltaic (BIPV) system, which uses a single semitransparent Photovoltaic (STPV) module on a facade at a 90-degree tilt connected to an EcoFlow portable power station that functions as both the inverter and battery. I am seeking guidance on the most accurate way to model this setup in PVsyst, as I have two primary questions: First, the setup is not connected to the grid and the EcoFlow's battery capacity is a fixed component that was not sized based on an energy demand profile, is it more appropriate to model this system as grid-connected rather than standalone? Second, given that the EcoFlow unit combines the inverter and battery, what is the recommended approach for modeling it? If I need to represent it as separate components, I would appreciate guidance on the key technical parameters that are essential for an accurate simulation.

Thanks for respond, How about Uv? is there anyway to model it more accurate?

Hello PVsyst community, I am working on a research project focused on the long-term aging and performance degradation of Building-Integrated Photovoltaic (BIPV) systems. To accurately model this, I need a more detailed understanding of PVsyst's internal calculations. I have already reviewed the official documentation, but I have a few specific questions that I'm hoping for some clarity on: Temperature Modeling for BIPV: I understand that PVsyst does not have a detailed building model for BIPV. The documentation suggests importing a custom temperature time series. Could you please provide more insight into the specific equations used in the internal thermal model for BIPV (or non-ventilated modules)? For example, are there any specific heat transfer coefficients or thermal resistance parameters that can be adjusted to better simulate the higher operating temperatures of BIPV modules? Losses and Aging Equations: I need to understand how the software models long-term performance losses. Could you elaborate on the mathematical models or equations used for Thank you in advance for any documentation, white papers, or detailed explanations you can provide. Your insights will be invaluable to my research.

Hello, Have you found answer for this matter?