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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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    Under what conditions is this test really required ? - all it tells you is how bright the sunshine is today, and perhaps that the wiring is correct, that you can verify on-load.

    No need for blast containment - as noted earlier the short circuit current will only be a bit more than the normal running. But it is not a very sensible test - unless you are at midday and optimally aligned to the sun on a clear day in June , it is quite likely that at some other time the normal running current will be higher. 

    Mind you, today must be close to UK peak solar.
    gridwatch  reckon 20% of UK power is solar today - so I suspect a  record soon if not already.

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  • 0
    Under what conditions is this test really required ? - all it tells you is how bright the sunshine is today, and perhaps that the wiring is correct, that you can verify on-load.

    No need for blast containment - as noted earlier the short circuit current will only be a bit more than the normal running. But it is not a very sensible test - unless you are at midday and optimally aligned to the sun on a clear day in June , it is quite likely that at some other time the normal running current will be higher. 

    Mind you, today must be close to UK peak solar.
    gridwatch  reckon 20% of UK power is solar today - so I suspect a  record soon if not already.

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