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  • PV Circuit Fusses 




    Combiner and DC disconnect fuses are the most important because they do protect the installation on the inverter side and they must totally disconnect the DC power generation from the rest of installation. This fuses must take in consideration other current values like the inverter feedback current in case of the ground fault and the reverse currents. The reverse currents are solar cells generated currents based on difference of temperature and irradiation values along large strings with different environment exposures like different levels of irradiation or temperature, inclusive snow deposit on the solar panels. 

    Reverse Current Curve

     Some of the fault conditions may generate reverse currents:

     Case of failure: Defect bypass diodes (at panel level);
     Case of failure: Earth fault (at panel level);
     Case of failure: Installation error (at panel level);

     Before selecting the proper fuse we have to give importance to following constraints:

    Irated < „maximum series fuse rating”;

     The current value for which the selected fuse is rated must be less as "maximum series fuse rating" for the strings' solar panel:

    Irated > 1,5 *Isc (Module Panel short circuit current);

    The size of the rated current for the fuse must follow the Isc (short circuit current) value recommended by the manufacturer for the specific type of solar panel at STC conditions.

     At the very final the fuse size must verify the constraint:

    IN RED > ISC'

    Where IN RED is the "IN working value" or "IN field value" and ISC' is the short current at the panel level corrected based on temperature conditions deviating by Δ ϑ from the STC values and the way we group the fuses together inside the combiner or disconnect box.

     The final IN is a notch up iterated value related to IN RED value.

    Fuses Melting Time

    A very important step is to evaluate the melting time for the fuse link in real conditions. We have to make sure that the melting time of the PV fuses inside the combiner boxes respective DC disconnect is less or equal to the solar panel melting time. On other hand we have to make sure that the PV fuse we have selected it is less than the value at STC conditions. In this way the protection it is verified as being properly carried during the life time of installation.

    t(s) < T(s)

    T(s) is melting time of the fuse link at STC conditions; t(s) is the value extracted from the melting time fuse characteristic curve (see pic).

    For an in detail step by step dimensioning of a solar PV fuse we strongly recommend the article:

     [Tech Support] Read from Knowledge Base and download a pdf file @ Article:  Fuses in Photovoltaic Systems - Four Steps Selection. 

    The information posted herein has been compiled by Clean Energy Brands from OEM product data and reputable publications. All rights reserved!



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