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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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  • 0
    OK I will light the blue touch paper!


    Given the CSA of the conductors to the inverter need to be slightly over sized for a reduced volt drop and the output of the inverter is limited by the ability of the panels to deliver their maximum output, why do your need overload protection?


    Also I have never measured the short circuit current  myself on the DC side by shorting out the DC supply conductors and clamping the short, what sort of PFC do you get on say a 3.4kW panel? I do know to do this you have to measure the light falling on the panel(s) and apply a calculation. So what PFC on the DC are you getting typically?
Reply
  • 0
    OK I will light the blue touch paper!


    Given the CSA of the conductors to the inverter need to be slightly over sized for a reduced volt drop and the output of the inverter is limited by the ability of the panels to deliver their maximum output, why do your need overload protection?


    Also I have never measured the short circuit current  myself on the DC side by shorting out the DC supply conductors and clamping the short, what sort of PFC do you get on say a 3.4kW panel? I do know to do this you have to measure the light falling on the panel(s) and apply a calculation. So what PFC on the DC are you getting typically?
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