MONA

Hello everyone, I am redesigning the string layout of an existing PV system after removing some modules. The physical module layout should remain as close as possible to the existing installation. In the new design, every string must have exactly 19 modules in series. I have two separate questions: 1. Some 19-module strings have to run across several separate roofs. The roofs have the same tilt and orientation. Is it possible in PV*SOL to define one electrical string whose modules are placed on different separate roofs? 2. Independently from that, some strings have to be connected in parallel, for example two separate strings with 19 modules each as one parallel string group. How should this be modelled correctly in PV*SOL? The strings crossing several roofs are not necessarily the same strings that are connected in parallel. My main question is: Can PV*SOL handle both cases in one project, while keeping the real physical module placement as much as possible? If this is not possible directly, what would be the recommended workaround for a realistic yield comparison? Thank you very much for your help.

Hello everyone, I am currently working on a university project involving an existing large rooftop PV system. The system consists of more than 13,000 PV modules in total, distributed across many strings, existing generator junction boxes (GAK) and inverter units. Due to a requirement from a regulatory authority, several modules in the upper roof rows have to be removed because they extend beyond the roof ridge. As a result, parts of the existing PV generator field must be redesigned to remain compliant while minimizing energy losses. My task is not to design a completely new PV system from scratch. Instead, I have to evaluate and optimize an existing installation after the removal of several hundred modules. The project includes: analysis of the existing PV generator field, development and comparison of different retrofit solutions, redesign of the string layout, reassignment of strings to existing generator junction boxes (GAK), verification of electrical constraints such as string voltage, current, inverter limits and MPPT operating range, evaluation of whether existing cabling can continue to be used, consideration of possible shading effects, adaptation of the existing string monitoring system, and comparison of the technical and economic impacts of different solutions. My question is: Would PV*SOL Premium be a suitable tool for checking and validating such retrofit variants? Or is this type of task usually better done manually, for example by using the existing string plans, module and inverter datasheets, Excel calculations, and separate electrical checks? I am especially interested in how such retrofit projects are normally handled in practice: Do engineers usually model the modified system in software, or do they mainly redesign the strings manually and then verify voltage, current and inverter limits separately? I would be very grateful for any practical experience or recommendations. Thank you very much.