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Solax PV invertor on shared 30mA type A RCD

Lee B

Good afternoon,

I require some guidance on the subject of a SOLAX PV invertor being installed on a shared type A RCD. We have a contractor who claims there is differing industry guidance on this subject but they have providied any supporting evidence to suggest this is the case. 

The contractor sent me the following from the manual - 

I gave them the guidance from the COP Grid connected solar PV systems page 90 - Solar PV systems shall not be installed to the load side of any RCD that is shared with other circuits (for example, where the RCD is feeding a number of circuit breakers / circuits)

I gave them the scenario that if one of the shared ciruits tripped the RCD under fault conditions, would the invertor carry on feeding the fault or disconnect within 300ms as per the 30mA shared RCD.

Any help on shedding light on the above matter is greatly appreciated.

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  • +1

    The inverter should still detect that the mains supply has disappeared and shut itself down.  Inverters deliberately don't exactly match the phase of the incoming supply.  That way, they can use the bit of the cycle when the inverter isn't generating to check if the mains supply is still there.  I assume that's the "Active Frequency Drift" thing that the manual talks about.

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  • +1

    The inverter should still detect that the mains supply has disappeared and shut itself down.  Inverters deliberately don't exactly match the phase of the incoming supply.  That way, they can use the bit of the cycle when the inverter isn't generating to check if the mains supply is still there.  I assume that's the "Active Frequency Drift" thing that the manual talks about.

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