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Most modern panels have bypass diodes and shading is contained to the the effected panels only. In addition multiple panels in series raise the PV voltage thereby negating the potential voltage drop between the PV array and SCC. The VOC of our array is 149vdc allowing us to utilize the OEM 10AWG wire with neglible voltage drop. With temp correction the PV voltage can actually approach 187v. Lastly higher PV voltage makes for earlier harvesting in the AM and later harvesting in the evening.
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