MJCM Posted August 22, 2022 Share Posted August 22, 2022 How can you find out which cable coming from a Solar Panel is + and - My BIL will bring me 2 330W panels (he has laying around at his house) and he told me the MC4 connectors have been cut off. Why that is? No idea. Is it like in the picture, left hand side is - and right is + Link to comment Share on other sites More sharing options...
Crossy Posted August 22, 2022 Share Posted August 22, 2022 They might be marked inside the connector box, but the simple test would be to strip the cable ends put the panel in the sunshine and check with your multimeter. 1 Link to comment Share on other sites More sharing options...
MJCM Posted August 22, 2022 Author Share Posted August 22, 2022 (edited) 7 minutes ago, Crossy said: check with your multimeter. Oke thx. What is the difference in the + and the - when checking with a Multi Meter? ???? Edit: If wrong way round then no reading?? Edited August 22, 2022 by MJCM Link to comment Share on other sites More sharing options...
Crossy Posted August 22, 2022 Share Posted August 22, 2022 4 minutes ago, MJCM said: Oke thx. What is the difference in the + and the - when checking with a Multi Meter? ???? Make sure your test leads are in the right holes (Com is usually the black lead). Set to DC volts. If the meter reads a +ve value then the red lead of the meter is on the + lead of the panel. If the meter reads a -ve value then the black lead of the meter is on the + lead of the panel. Check by measuring a known source, like a 9V battery that has + and - marked. 1 Link to comment Share on other sites More sharing options...
MJCM Posted August 22, 2022 Author Share Posted August 22, 2022 Yes it works perfectly. I tried it with a AAA battery Red on + = 1.41 Black on + = -1.41 Thx a lot! 1 Link to comment Share on other sites More sharing options...
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