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Wong Wei Chong

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  1. Hi, Is there a way to retrieve all the system set up parameters (i.e. PV/inverter model, rated power, Total DC capacity, Toal AC capacity) on page 1 in excel format?
  2. I have question on whether I should select leading or lagging Power factor in PVsyst. I am doing a grid connected PV system. As far as I know, transmission line is normally inductive due to more inductive loads at downstream and this causes the P.F to be lagging. So when the grid has asked my PV system to compensate the reactive power and operate my PV system at say 0.9 P.F, should I set it at 0.9 lagging (following the P.F of the grid at point of connection?) or leading as I am actually supplying reactive power to improve the lagging line P.F?
  3. Hi Andre, Thanks for your reply but I can't seem to find "pedagogic" I/V curves explanation in "Module layout" detailed calculation tab. Please enlighten me. Anyway, I got what you mean that if we define each and single string in "Module layout", everything will be accounted for. However, in most of the cases, I only need to do preliminary design where it is really not necessary to go into this detailed. I am more interested to know in "Orientation",field type "unlimited sheds", how should I define the number of strings for electrical effect that gives a reasonable and realistic simulation for scenarios that I mentioned in my previous posts. Thank you!
  4. Hi Andre, Would appreciate your confirmation on my understanding below. I came up with 2 scenarios: Scenario 1: Capacity: 2 strings of 24 nos 270Wp Table: 2x24 Landscape (2 rows, Up and down) Inverter: SMA Sunny Tripower 12KTL (2 MPPT) My understanding is if I connect 2 strings separately to the 2 MPPT, I can define 6 strings in the electrical loss because it is essentially 6 "sub-strings" due to the bypass diode. And if I connect both 2 strings to only 1 MPPT, then I would have to define only 2 strings in the electrical loss. Am I correct? Scenario 2: Capacity: 2 strings of 24 nos 270Wp Table: 2x24 PORTRAIT (2 rows, Up and down) Inverter: SMA Sunny Tripower 12KTL (2 MPPT) My understanding here is because it is portrait, there are no substrings like in the Landscape case. This is because once the bottom row of cells are shaded, the entire string will be affected electrically. The diode can't help in this case. Therefore, irregardless if I connect these 2 strings to the same/ different MPPT, I should still define 2 for the number of strings for electrical loss. The above 2 scenarios are rather straight forward way of stringing the modules. However, I came across some cases whereby in 2x12 Portrait table (one string one table), the modules are stringed in a U-shape ; or in 2x24 portrait in a double U-shape (two strings are separated into left and right instead) to save the solar cable. In this case, how should I define the number of string for electrical loss then? If in situation where instead of Portrait, the modules are in Landscape but also string in U-shape, isn't it gonna be more complicated? Thanks in advance.
  5. Hi, I run a free field project on a hilly site with near shading scene imported from Helios. Indeed the tilt angle and azimuth were auto updated in the simulation. The new tilt angle and azimuth are different from the intended ones and caused some confusion to the client. Could you please explain why?
  6. Hi Andre, I have done likewise for my shading scene that was imported from Helios with different topographic condition. The outcome is for winter period (I used 60 deg for winter), the generation is zero which could not be the case. However when I do it on a flat land, the outcome is fine. Is this a software limitation of PV syst? Thank you.
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