Falberto76

Hi Michele, thank you for your feedback. Just a small clarification for the posted point: "but with only one tracker allowed to to do backtracking." -> actually I was meaning only "one tracker axis to backtrack". Sorry for the language, it was written fastly. As a matter if fact we need to assess such type of trackers, since there are hundreds of MWp installed in Italy. Based on your feedback we understand in the batch simulation we will implement as parameter the axis orientation given by the controller algorithm and (maybe) is it possible to calculate the batch only for the specific time or an entire year shall be performed? Then we take as output the GTI and rebuild the annual GTI from the batches calculation. Down in the sankey diagram we could apply the other losses taken from the same b.o.p system configuration. Of course this will have an higher uncertainty than normal calculation. We will revert to the post after getting some progress in this task. We're also actually thinking to start from basic equations but may be it is very time consuming. thank you!

Hi, We have to simulate an old version of horizontal tracker, which has two horizontal axis, one axis oriented in N-S direction and whose rotation determinates the tracking along the E-W direction (+/-60°) , and another axis which optimize the tilt (range -15/+45) alond the daily sun movement. the two axis support frame of PV modules. We have been told by the backtracking algorithm company that the tracker performs backtracking on both the axis and we're trying to get from them the tracking astronomical map of the trackers. We have difficulties to find a reliable way to simulate the energy yield on PVSYST since the SW allows to consider backtracking only at 1 of the two axis. We have operating data too of existing plants with the same tracker and performed some simulation with PVSYST with backtracking only at 1 of the two axis in order to verify if the simulation roughly approximates the field behaviour. The complexity is given also by the fact that we should also simulate the same trackers with different PV modules, due to a revamping strategy which interests such trackers. Here the questions. 1) Assuming we're able to get hourly values of tracker position in both axis, is it possible to calculate GTI on such custom orientations and get back an excel file? 2)Assuming the above (or either finding another reliable tool which implements the Perez transposition on the tracking surface), an idea could be to obtain the annual GTI and then roughly calculationg the yield by using the Performance ratio calculated with PVSYST on the same system, but with only one tracker allowed to to do backtracking. This may imply calculation errors but anyway will approximate the energy behavior and - correct me if 'm wrong - the other losses from GTI surface collected energy to energy output at the meter should not be too different. Is this plausible or there are any ways to do the calculation? Another way could be to calculate the system as a single axis (ie considering the primary axis only, i.e the one which has the greater rotation along the day), let's say the N-S axis which turn the E-W rotation, and assume a constant tilt, or a limited tilt to be sure the tracker does not go in mutual shading, and calculate with this configuration the yield. Then the yield could be adjusted by calculating the GTI on the tracking plane which follows backtracking in both directions. Thank you for any hints or suggestion