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DC isolators and RC62

lyledunn

The RISC document RC62 asks installers to carefully consider the need for DC isolators. It is not unreasonable for insurers to insist that the additional risk associated with the devices is appropriately assessed. This is one of two 100Kw inverters. They are both housed in a purpose-built concrete block structure abutting a large door manufacturing plant so fire spread may be reasonably controlled. However, do we really need to have an isolator on each string. Likely done this way as it connects to the individual MPPT inputs?

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    I think this possibly a Contractual and Designer issue.

    If it is an issue at all. I'd be minded to do the same, keep all strings on their own isolator, it's clearly a medium sized install (rather than a 4kW domestic), so being able to isolate individual strings would be beneficial at times in the future. You could also have the problem of too much current for one/two/three  isolators, so string based isolation would be my choice. 

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    I think this possibly a Contractual and Designer issue.

    If it is an issue at all. I'd be minded to do the same, keep all strings on their own isolator, it's clearly a medium sized install (rather than a 4kW domestic), so being able to isolate individual strings would be beneficial at times in the future. You could also have the problem of too much current for one/two/three  isolators, so string based isolation would be my choice. 

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