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Cu change before pv install.

hertzal123
Customer wants to install pv panels after the new cu has been fitted and I just wondered what devices to fit for it.Think the PV is 4kw,so I thought maybe a B20 mcb and a DC sensitive rcd?Thanks for any advice.

                                                Regards, hz
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    Check the RCD requirement for the inverter.  Don't assume it will be 30mA.  Even if the inverter is suitable for a 30mA RCD, you may have problems with nuisance trips after storms, and this may only show itself as the installation ages.  So giving the inverter its own RCD is a good idea.


    There will need to be an isolator between the CU and the inverter.  It might make things easier to get that in place in advance.
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    Check the RCD requirement for the inverter.  Don't assume it will be 30mA.  Even if the inverter is suitable for a 30mA RCD, you may have problems with nuisance trips after storms, and this may only show itself as the installation ages.  So giving the inverter its own RCD is a good idea.


    There will need to be an isolator between the CU and the inverter.  It might make things easier to get that in place in advance.
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