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Mixing panels - will this work?


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Hi all

I am looking at changing my current panel configuration and adding more panels (use 4 existing ones and add 2 additional ones). My problem is, that the panels that I currently have are not easily available anymore. My installer has offered me used ones (21 month in usage) at what I deem an unacceptable price. I therefore would appreciate your guys' view on if I can mix my current panels together with new alternative ones:


My installer wants R 200 more for the used panels than I can get the new panels for. I understand that I will have slight efficiency losses by taking the new alternative ones - but the question is whether this will actually be noticeable (this string is less than 1/3rd of my total PV)

I am leaning to the new alternative ones. What would you recommend?

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