Is it normal for 1 string to be slightly better than another

[albie999]

Still getting used to how my Solar system is working, after it being installed (and working for 3-4 weeks). As I look more into the reports, wonder if it is normal for 1 string to work better than the 2nd? My setup is - 14 x AIKO-A-MAH54Mb panels (south facing), 1 x H1-6.0-E-G2 Inverter, 1 x Fox 10.36kwh EP11 battery and a MyEnergi Zappi EV charger (wired separate from battery)

Looking at the last few days .. can see PV1 always outperforms PV2. In the pic of my solar array, I am not sure which is PV1 and PV2

[Dave Foster]

It’s not unusual and the difference I can see there is only marginal, it’s most likely the top string is hotter than the lower string (heat will be rising from under the black panels) and for every degree above 25C you will see the panels derate by approx 0.5%

[albie999]

It’s not unusual and the difference I can see there is only marginal, it’s most likely the top string is hotter than the lower string (heat will be rising from under the black panels) and for every degree above 25C you will see the panels derate by approx 0.5%

Thanks Dave, yet again thanks for the advice .. it is a good learning curve this solar stuff ... I am sure there will be more questions to come ... but glad, that as you said .. that is normal .. and nothing to worry about

[Will]

The slight difference can even be down to the dc solar cable length. I bet one string has a slightly longer cable run.