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Solar panel supply

aligarjon
Hi Guys.  Is the circuit breaker rating relevant for a solar panel supply.  I have seen ratings as low as 6 amps and up tp 16 or 20.   I did a board change last year and fitted a 16amp rcbo to the solar supply. The existing was a 16amp circuit breaker.   The customer has recently contacted me and says that the rcbo trips when the solar is producing 3.4kw i think he said.  I have said i can change it for a 20amp.  I don't actually know how many panels he has.  Is the problem likely to be a fault on the panels or just overload.  somehow.


Cheers


Gary
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    Mike


    Thanks for the explanation. As I suspected the ability of both the inverter and the PV string to to deliver shed loads of fault current is not the same as our DNO transformer supplies.


    I wonder what the purpose of the short circuit test on the DC conductors is designed to prove or verify? Shorting the DC conductors together and switching on to apply clamp meter seems to be counter to self survival and survival of the PV panels to me as we would not do this on a generator or transformer supply outside of a test facility with ballistic protection.
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  • 0
    Mike


    Thanks for the explanation. As I suspected the ability of both the inverter and the PV string to to deliver shed loads of fault current is not the same as our DNO transformer supplies.


    I wonder what the purpose of the short circuit test on the DC conductors is designed to prove or verify? Shorting the DC conductors together and switching on to apply clamp meter seems to be counter to self survival and survival of the PV panels to me as we would not do this on a generator or transformer supply outside of a test facility with ballistic protection.
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