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Earthing of panels


markus_m2
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We have 8 panels in one string. I've found a lot of earthing info on this site, but can't find a specific answer to this question:

Does one really need to earth each individual panel, or is it OK to earth just one and have the mounting structure effectively earth the rest (aluminium / Renusol rails), or maybe earth even second or third one (in which case you may as well just do each one).

 

Many thanks - for future answer to this and also all the other good info you guys have posted, this is one of the best sites I've found in ages and I find myself checking "new posts" every time I have a free minute :)

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9 hours ago, markus_m2 said:

Does one really need to earth each individual panel, or is it OK to earth just one and have the mounting structure effectively earth the rest (aluminium / Renusol rails), or maybe earth even second or third one (in which case you may as well just do each one).

I earth my rails and connect all the rails together. We were suppose to attend one of the first SANS courses on PV regulations from the 10th of April, but its now been cancelled. Once we attended, I will give feedback on what the regulations require.   

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2 hours ago, JacquesVDM said:

I earth looped each panel as there was not conductivity to the rails due to the anodizing of the aluminium

I had to do the same. But I guess it will depend on what type of panel clamping hardware you use. Goodwe recommends a maximum resistance of 20kOhm between panel and ground.  

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  • 3 months later...

There are solutions to ensure anodizing doesn't cause a problem and that all panels/mounting have a conductive connection, however they don't seem to be very popular or readily available in the country for whatever reason. Or maybe its just a case of people not being aware that it is an issue or that there is a solution?
http://www.we-llc.com/products/weeb-washer

Edited by mmacleod
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