Hi guys.
As I really want to contribute I decide to write my experience with panels of this topic.
I'm DIY-er, I build up on-grid 12kWp system with 20pcs Yangtze 600W panels(YS600M-144, dimmension 2274*1134*35) and each have Tigo 700W optimizer below. I have two strings of panels wired in series: one string 11 panels oriented west and second string 9 panels oriented east.
West string Voc 513V (just before inverter kick on), max current 12,8A (inverter max Isc 15A)
East string Voc 417V (just before inverter kick on), max current around 12A.
I purchase last year Tigo premium membership to have all possible data from optimizers as I was curious about panels performance. And I must to say, I catch a moments where some panels push out even more than 550W (for example when outside is not more than 20°C and sun suddenly appear directly on the panel behind a cloud). But normally during spring/autumn time when outside air is below 25°C they have continuous power between 420W and 470W. Now during hot summer (outside 25-35°C) they continuously have 420-440W).
During winter we have about 60cm of heavy snow on them, no problems so far (I have them oriented landscape).
And I order now more of them because I extend my roof and have space to put a few of them on and expand my system. It's hard to find this dimmension in Europe and when I find them to fit, price was more then 50% more than from China.
The only problem that I have was short connecting cables (30cm). It was my mistake because I should order with 1m cables to be able to connect optimizers. So I made short MC4 extension cables to connect everything together. I was not happy that time and skeptical a little bit as there is more possibility of failure, but after year and a half now everything works without problem. I do visual inspection time to time as I have access from ground, I have tight fuses for both strings (15A), monitoring inverter data on Home assistant, etc. So far so good. Yearly production is about 8.5MWh and please consider that orientation is far away from ideal south as I mention above.
So that's my story about Yangtze panels. Yes, they are huge, but they work on cloudy or even rainy days and I cover house consumption completely. There was zero production only when I have snow on them.