I have a new solar installation w 4 x 215W panels in 2S2P wiring to a Victron SmartSolar 100/50. Measured Voc is 45.1V, which is expected for these panels. It is April 24th in Akron, OH and with the panels mounted flat on my RV roof. I'm getting about 478W max production at noon on a cloudless day with clean panels. No shading. That's not great considering their theoretical output of 860W. I also noticed that the voltage is dropping from 45.1Voc to around 36V under load. I've double checked all my connections. Would this be considered a normal voltage drop or should I investigate my wiring? I'm using the pre-wired MC4 roof port with 10awg wire that came with my trailer.