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Farm Building and Infrastructure
Renewable Energy
Inverter tripping
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<blockquote data-quote="Exfarmer" data-source="post: 7874481" data-attributes="member: 1951"><p>If your problem is earth leakage I am afraid it is not good news if it is roof mounted. A common fault is these systems when they were installed the connectors were supposed to be tied up out of harms way. However this took time at least 20 seconds and a cable tie and often they were just left dangling across the ridges. sadly over time they drop into the channels and a build up of moss and dust etc makes a little dam around the MC4 this can form quite a pool of muddy sludge which eventually penetrates the MC4 possibly causing a direct leakage to the roof on a damp day or corrosion internally which leads to shorting and finally a total burn out of the connection which leads to failure of that circuit.</p><p>You must get the circuits tested out for voltage and resistance to earth. I am afraid that you may be in for a big bill. Its no comfort but we have just had to strip off and replace a 60 Kw array array for this problem. I suspect a lot will be in exactly the same position.</p><p>The situation is compounded if you replace some of the old inverters with new ones as the standard for resistance has gone up.</p><p>So we have an old array which tests 30,000 Ohms on a damp day and the inverter is just happy with a new one will would want a minimum of 100,000 Ohms. A good array on a dry day will probably read in the order of 5,000,000 OHMs to put it in perspective but all arrays will have a little leakage on a damp day</p></blockquote><p></p>
[QUOTE="Exfarmer, post: 7874481, member: 1951"] If your problem is earth leakage I am afraid it is not good news if it is roof mounted. A common fault is these systems when they were installed the connectors were supposed to be tied up out of harms way. However this took time at least 20 seconds and a cable tie and often they were just left dangling across the ridges. sadly over time they drop into the channels and a build up of moss and dust etc makes a little dam around the MC4 this can form quite a pool of muddy sludge which eventually penetrates the MC4 possibly causing a direct leakage to the roof on a damp day or corrosion internally which leads to shorting and finally a total burn out of the connection which leads to failure of that circuit. You must get the circuits tested out for voltage and resistance to earth. I am afraid that you may be in for a big bill. Its no comfort but we have just had to strip off and replace a 60 Kw array array for this problem. I suspect a lot will be in exactly the same position. The situation is compounded if you replace some of the old inverters with new ones as the standard for resistance has gone up. So we have an old array which tests 30,000 Ohms on a damp day and the inverter is just happy with a new one will would want a minimum of 100,000 Ohms. A good array on a dry day will probably read in the order of 5,000,000 OHMs to put it in perspective but all arrays will have a little leakage on a damp day [/QUOTE]
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