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Where can a PV array be connected?

Chris Pearson

I suspect that a PV array would normally be connected between the meter and the first DB, but can it be connected more peripherally please?

The most suitable area of roof is at the opposite end of the premises from the electrical origin. However, there is a small DB with spare ways adjacent to the loft space. It supplies one lighting and one socket circuit and is seldom significantly loaded. The distribution circuit from the main DB is 16 mm² singles (with the live conductors being sheathed). As far as I can see, it travels through under-floor voids and is boxed in with other services as it ascends in a bathroom so RCD protection is not required. If the inverter can be situated in the loft space then only a short length of AC cable would be required.

This is what I have in mind.

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  • 0

    Yup - looks like one of the bits of bus-bar has drifted to the wrong end. I'd expect Grid and PV to come in at one end and links and the main CU connection to be at the other. Electrically I suppose you could have one pole (N or L) connections (but not the actual switch) 'upside down' as it were - it would work the same, but would be a lot less obvious to wire up.

        - Andy.

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  • 0

    Yup - looks like one of the bits of bus-bar has drifted to the wrong end. I'd expect Grid and PV to come in at one end and links and the main CU connection to be at the other. Electrically I suppose you could have one pole (N or L) connections (but not the actual switch) 'upside down' as it were - it would work the same, but would be a lot less obvious to wire up.

        - Andy.

Children
  • 0 in reply to AJJewsbury
    AJJewsbury said:
    Yup - looks like one of the bits of bus-bar has drifted to the wrong end.

    I hadn't appreciated that the tabs are wee busbars. Yes, both should be on the load side, which is in accordance with the diagram. (Should they be in the terminal tunnels?)

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