I have an 18kpv inverter and string 2 & 3 are both on a roof, at the same angle and 14 panels each. (Alexus ALEX-400-B-54-S) with APSmart RSD-D's on every other panel. I've noticed thru the day with no cloud cover String 2 and 3 will randomly be different, right now 2 is ~4.6k and 3 is hitting ~3.8k Sometimes I'll see them flipped the other way around. I'm not sure if this is normal behavior or something I should be looking closer at for an issue. It'd be one thing if either string had any shade, cloud cover etc... but I've checked multiple times and don't think there is any difference in the intensity of light hitting them, both strings at the same angle, one above the other. Any suggestions, or perfectly normal behavior?
