- Feb 13, 2020
- 17
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- If you're a qualified, trainee, or retired electrician - Which country is it that your work will be / is / was aimed at?
- United Kingdom
- What type of forum member are you?
- Practising Electrician (Qualified - Domestic or Commercial etc)
Hi guys.
Got an issue with a DC string ... I am doing some DC testing and one of the strings is 0.5ohms (negative to earth). Positive is 29mohms and rising to earth.
Now usually I would expect to find a crappy mc4 or a damaged cable but this time I am on a farm where all the cable is visible and looks ok.
I have disconnected the pos and neg at either end of the string and now when I test to earth at the inverter location it is clear? Tested all the panels to earth and they are clear.
I suspect it is the cable but why is it testing clear when disconnected from the panels ?? I am getting into the solar a bit more and have some more questions in the bank for future posts
hope I can find somebody in the no....
Many thanks
dB.
Got an issue with a DC string ... I am doing some DC testing and one of the strings is 0.5ohms (negative to earth). Positive is 29mohms and rising to earth.
Now usually I would expect to find a crappy mc4 or a damaged cable but this time I am on a farm where all the cable is visible and looks ok.
I have disconnected the pos and neg at either end of the string and now when I test to earth at the inverter location it is clear? Tested all the panels to earth and they are clear.
I suspect it is the cable but why is it testing clear when disconnected from the panels ?? I am getting into the solar a bit more and have some more questions in the bank for future posts
hope I can find somebody in the no.... Many thanks
dB.
