smsas

Good day, I am trying to simulate a "stand-alone" system with multiple PV orientations. Each PV module will be connected to its own MPPT, so mismatch is not a problem. However, I can't find a way to aggregate the generation of all PV modules in a "stand-alone" system to check that the generation, together with the storage, is enough to satisfy a given load ("user's needs"). This is why I've used a "Grid-Connected" system with multiple PV orientations, no grid injection, with a storage system and "self-consumption" defined. However, in this system, the battery usage has an additional (and very high) energy penalty: "Battery Out, Inverter loss". For example, when there's no generation at night, I've seen that the one-way efficiency is 74% (meaning 1.35Wh to satisfy 1Wh of load), which doesn't make sense for my system. So, the general question I ask is: how can I better simulate my stand-alone system with multiple PV module orientations? If there's no clear way, the more specific questions would be: 1. Can I define the PV generation in a "Stand-Alone" system so that the software will take the aggregated PV generation as input and simulate the storage and consumption? 2. Can I define the parameters of the "battery inverter" in a "Grid-Connected" system so that the handling of the batteries in this system is more accurate (to my system)? Thank you very much for your help! Sebastian

Good day, I'm having a hard time understanding the probability of "loss of load". I have a PV+battery stand alone project. I've seen that even when the loads>generation, the PLol is 0%. However, if I table the missing energy, there is some. How can I connect the missing energy to a loss of load event? Thanks.

Hi, I am simulating bifacial production using the latest PVsyst version. Seeing the results, I am wondering if there's any kind of validation on the results given by the model? PVsyst consistently reports irradiance gains of 3 to 6% on the rear side of fixed systems (20-30% albedo). I have find that this is not congruent with the measured data I have read in different empirical studies: Modelling of bifacial gain for stand-alone and in-field installed bifacial (http://www.sciencedirect.com/science/article/pii/S1876610216304520) Field Example of Bifacial Gain at Sandia (https://pvpmc.sandia.gov/pv-research/bifacial-pv-project/outdoor-bifacial-pv-performance-data/field-example-of-bifacial-gain-at-sandia/) I would appreciate any comment on the accuracy of the model. Thank you very much. Best regards, Sebastian.

Hi I am trying to get the transposition factor for a N-S axis Tilt=0, without having to make a complete simulation. This search led me to the transposition factors tool, which gives you these factors not only for fixed tilt, but also for tracking planes. Unfortunately, the tracking planes showed are tilted ones (Tilt = Lat and Tilt = lat-10º). Is there a way of obtaining easily this factor for an N-S tracker tilt=0 for different sites? Thank you very much.