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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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    OK I will light the blue touch paper!

    :

    the output of the inverter is limited by the ability of the panels to deliver their maximum output, why do your need overload protection?

     



    Good point - I can see that the PV inverter could be treated as a fixed (maximum) (negative) load - so in theory overload protection could be omitted. You'd still need fault protection on the a.c. side though, and ADS - which might limit your maximum MCB size a bit though (especially if the inverter is a decent distance from the CU).


       - Andy.
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  • 0

    OK I will light the blue touch paper!

    :

    the output of the inverter is limited by the ability of the panels to deliver their maximum output, why do your need overload protection?

     



    Good point - I can see that the PV inverter could be treated as a fixed (maximum) (negative) load - so in theory overload protection could be omitted. You'd still need fault protection on the a.c. side though, and ADS - which might limit your maximum MCB size a bit though (especially if the inverter is a decent distance from the CU).


       - Andy.
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