Kilowatt Power Posted February 25, 2021 Share Posted February 25, 2021 Greetings, Can I connect 2x405Wp panels for a total of 810Wp in 1S2P configuration on the Axpert MKS 3K-24 (PF1) without any issues? Inverter SCC specifications are Voc 75Vdc, Max PV array power 600W, MPPT range 30~66Vdc and Max PV charge current 25A. Jinko Cheetah HC 72M panels STC/NOCT specifications are Pmax 405/306Wp, Vmp 42.0/39.8V, Imp 9.65/7.72A, Voc 50.1/48.7V and Isc 10.48/8.22A General guidelines here and other forums [FAQ 5] advocate maximum 12.5-20% oversizing but I cannot find panel sizes between 350Wp and 375Wp. Thank you. Quote Link to comment Share on other sites More sharing options...
Coulomb Posted February 25, 2021 Share Posted February 25, 2021 (edited) On 2021/02/26 at 12:35 AM, Kilowatt Power said: General guidelines here and other forums [FAQ 5] advocate maximum 12.5-20% oversizing but... I've relaxed my recommendation maximum oversizing a bit, I suspect that 25% is generally ok. Your proposal is 29%, which I think is still too much. Can you find a pair, say 360+410 or 375+410, where the Vmp are within 5% of each other? Edited February 27, 2021 by Coulomb Kilowatt Power 1 Quote Link to comment Share on other sites More sharing options...
Kilowatt Power Posted February 25, 2021 Author Share Posted February 25, 2021 31 minutes ago, Coulomb said: Can you find a pair, say 360+410 or 375+410, where the Vmp are within 5% of each other? Found a couple of 345Wp in the last couple of minutes. Other than these we mostly have 405, 450, 460 and 465 panels. Quote Link to comment Share on other sites More sharing options...
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