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Solar supply on test reports

Alan B

How do I document and test existing solar secondary supply when adding or modifying an installation that includes solar but not working on the solar system.

I have worked on a few installations now that have main supply plus solar, I have no training on solar installations.

I look to make sure cabling looks professional and that there are isolators on DC input to inverter and AC output from inverter, use them to isolate the supply while I work.

On the test report I record that there is a second supply and that it's solar but I don't do any testing or open anything up.

Is this enough or do I need to start learning more about solar and doing more?

I haven't worked on an installation with battery but same question.

Also if I was asked to do an EICR do I just agree with the owner that the EICR doesn't include the solar installation or do I need to decline the job until I get more knowledge on solar?

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  • 0

    In island mode the backup system will need it's own TT earth which will need testing

    It'll need it's own local electrode, but the resulting system will almost certainly be TN-S (in island mode) rather than TT. It's the equivalent of source electrode that's being added rather than the consumer's one.

       - Andy.

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  • 0

    In island mode the backup system will need it's own TT earth which will need testing

    It'll need it's own local electrode, but the resulting system will almost certainly be TN-S (in island mode) rather than TT. It's the equivalent of source electrode that's being added rather than the consumer's one.

       - Andy.

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  • 0 in reply to AJJewsbury
    AJJewsbury said:
    It'll need it's own local electrode, but the resulting system will almost certainly be TN-S (in island mode) rather than TT. It's the equivalent of source electrode that's being added rather than the consumer's one.

    Ideally TN-S, but there may still be requirements for certain parts of the installation which must remain on TT, as the installation will remain connected to PME - so PME conditions still apply (e.g. Section 722). Most importantly, in island mode, some types of open-PEN protection will cease operating effectively, yet there could still be a voltage on the PME earthing terminal.

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