logo elektroda
logo elektroda
X
logo elektroda
Advanced Search
logo elektroda

Expanding 14x310Wp PV System with Fronius 4kW Inverter: Adding Two Panels - Options & Solutions

Pan_Piotrus 26178 35
ADVERTISEMENT
Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
Reply | New topic
  • #31 19711459
    MichałS
    Level 35  
    Marek006 wrote:

    I would just like to remind everyone "builders" that if we add NEW panels IN SERIES with panels of even the same type but used for several years, especially in the case of these cheaper models, a significant current imbalance may occur and the so-called reverse currents can consume most of the extra power, as well as reduce the efficiency and service life of the entire installation .

    I am very curious how these currents will flow when connecting, for example, to 10 series-connected 250W panels, another 2 with a power of 270W??
  • ADVERTISEMENT
  • #32 19711596
    andrzej20001
    Level 43  
    What is reverse current??
  • ADVERTISEMENT
  • #33 19711758
    Marek006
    Level 14  
    andrzej20001 wrote:
    What is reverse current??

    In photovoltaics, these are currents that equalize potential differences between individual cells or panels, arising, for example, as a result of shading some of them or due to the different efficiency of individual cells or panels.
    They can lead to hotspots and accelerate the degradation of the installation, and in milder cases they simply reduce its power.
  • ADVERTISEMENT
  • #34 19712039
    r65
    Level 15  
    Marek006 wrote:
    andrzej20001 wrote:
    What is reverse current??

    In photovoltaics, these are currents that equalize potential differences between individual cells or panels, arising, for example, as a result of shading some of them or due to the different efficiency of individual cells or panels.
    They can lead to hotspots and accelerate the degradation of the installation, and in milder cases they simply reduce its power.

    Not links, but chains. Quote:
    "A short-circuit, wrong connection arrangement, covering of some panels or other failure may result in a reverse current in the strings of PV panels. This is the case if the open circuit voltage of one string is very different from the open circuit voltage of parallel strings connected to the same PV converter. The current flows from the working strings to the faulty ones, instead of flowing to the PV converter and feeding power to the grid."
    In the case of this thread, i.e. adding panels in one row, this does not apply.
  • ADVERTISEMENT
  • #35 19712083
    Marek006
    Level 14  
    r65 wrote:
    Marek006 wrote:
    andrzej20001 wrote:
    What is reverse current??

    In photovoltaics, these are currents that equalize potential differences between individual cells or panels, arising, for example, as a result of shading some of them or due to the different efficiency of individual cells or panels.
    They can lead to hotspots and accelerate the degradation of the installation, and in milder cases they simply reduce its power.

    Not links, but chains. Quote:
    "A short-circuit, wrong connection arrangement, covering of some panels or other failure may result in a reverse current in the strings of PV panels. This is the case if the open circuit voltage of one string is very different from the open circuit voltage of parallel strings connected to the same PV converter. The current flows from the working strings to the faulty ones, instead of flowing to the PV converter and feeding power to the grid."
    In the case of this thread, i.e. adding panels in one row, this does not apply.

    Bird poop and shadows can produce a similar effect within a single panel.
    Bypass diodes usually get the job done, but...
  • #36 19712501
    r65
    Level 15  
    Okay but that doesn't change anything. This happens in every installation, regardless of the type, number or mix of panels, and we have no influence on it.
    Well, maybe apart from washing the panels or cutting down the covering tree.
Reply | New topic
Report a violation of the law

Topic summary

The discussion revolves around the expansion of a 14x310Wp photovoltaic (PV) system with a Fronius 4kW inverter by adding two additional panels. Users debate the implications of this addition, particularly regarding reporting to authorities and the inverter's capacity. Some suggest that adding the panels without reporting is feasible since the inverter will not exceed its maximum output, while others emphasize the importance of adhering to regulations. Concerns about potential issues such as reverse currents and the efficiency of mixed panel types are also raised. The consensus leans towards adding the panels without formal reporting, as the increase in power is deemed negligible and unlikely to attract scrutiny.
Summary generated by the language model.
ADVERTISEMENT