Solar Wire Size..??? Fuses on panels...??
Ok, ready to install my solar system and I need to buy wire to go from panels to the solar controller Two, 140W panels, wired in parallel Here are the specs on the panel: The wire lengt...
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Morningstar string calc shows min Vmp @ temp (includes cell heating)
For a similar kyocera 140, min 15.58 Vmp @ 80F, 15.14 @ 90F, 16.9 @ 50F, full sun.
So if one takes 14.8v @ controller and adds 1.94v drop for 12g, 35', 17A, the result is 16.74v, this would be to the right of 15.58Vmp 80F, IV curve.
assuming a straight line from Vmp to Voc, 15.58 to 19.98 (mornstar sting calc @80F), ~2A loss or 26% of 7.78 Imp, more when hotter. @50F one should get full power, just to the left of Vmp on the IV curve.
Throw all this out claiming 14.3v charging AGM, full sun rarely, lpwer panel temp, 17A Isc vs 15.56A Imp, panel aging, never see 80F or higher, good enough, ...
For a similar kyocera 140, min 15.58 Vmp @ 80F, 15.14 @ 90F, 16.9 @ 50F, full sun.
So if one takes 14.8v @ controller and adds 1.94v drop for 12g, 35', 17A, the result is 16.74v, this would be to the right of 15.58Vmp 80F, IV curve.
assuming a straight line from Vmp to Voc, 15.58 to 19.98 (mornstar sting calc @80F), ~2A loss or 26% of 7.78 Imp, more when hotter. @50F one should get full power, just to the left of Vmp on the IV curve.
Throw all this out claiming 14.3v charging AGM, full sun rarely, lpwer panel temp, 17A Isc vs 15.56A Imp, panel aging, never see 80F or higher, good enough, ...
