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<blockquote data-quote="binky" data-source="post: 425303" data-attributes="member: 490"><p>Interesting article from Doepke. I don't quite see how you get a DC earth leakage. Apart from the fact there is no earth connection on the DC side, the inverters self check as they start up, specifically looking for DC faults. Whether they maintain any form of monitoring after start-up I don't know, although we have earth leakage faults reported during daytime running caused by freak-weather events on SMA units. Given that daylight usually comes in gently, I would have thought a DC leakage would be detected before it reached more than 6mA? I know my Power One often reads 2mA on start up. But I suppose the argument is that on a functioning system, would the RCD do its job? I'm trying to think how the relatively high resistance of an Earth Rod would affect mA leakage, as this is about the only time I would fit an RCD.</p></blockquote><p></p>
[QUOTE="binky, post: 425303, member: 490"] Interesting article from Doepke. I don't quite see how you get a DC earth leakage. Apart from the fact there is no earth connection on the DC side, the inverters self check as they start up, specifically looking for DC faults. Whether they maintain any form of monitoring after start-up I don't know, although we have earth leakage faults reported during daytime running caused by freak-weather events on SMA units. Given that daylight usually comes in gently, I would have thought a DC leakage would be detected before it reached more than 6mA? I know my Power One often reads 2mA on start up. But I suppose the argument is that on a functioning system, would the RCD do its job? I'm trying to think how the relatively high resistance of an Earth Rod would affect mA leakage, as this is about the only time I would fit an RCD. [/QUOTE]
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