October 28, 20205 yr Hi all, Here's the question: I want to upgrade my system - currently its a single string of 9 72-cell CS 335W panels going into an Infinisolar hybrid. I have in mind the Sunsynk 5.5 machine - which has two solar inputs. So I'd put the existing string on the one input and then build a new string for the other. Only the 335W panels aren't in stock. So I have a quote for 405W panels. Now I have two spare 335W panels - so my question is if anyone has practical experience with putting 2 72cell panels at 335W together with 7 405W Electrically I don't see why it wouldn't be fine. Obviously I need to check the total Voc. and confirm the short circuit current of the bigger panels is OK for the smaller ones. Its only 2 of the smaller panels so that would perhaps slightly decrease the total current flowing since their internal resistance must be a bit higher? Are there other effects I'm not thinking of. I guess it saves me say R5k so I don't want to be penny wise and pound foolish! Thanks,@Elbow
October 28, 20205 yr My understanding is that the 2 x 335w will pull down the 7 x 405w to 335w. I have read that the panels will de-rate to the lowest Volts/Amps of the string.
October 28, 20205 yr Author 10 hours ago, Barryv said: Ok, How you going to connect them? 4s2p or ..? It's 9S1P. 7x335W panels, 2x405W. The inverter max voltage is 500V Steve
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