Don't use SMA inverters, you will regret it...
I installed two SunnyBoy 6.0 (SB6.0-1SP-US-40) inverters in my 40-panel, 13 kW system about five years ago. No problems up until about six months ago, when one of the inverters arc-faulted.
I am extremely familiar with the entire installation because I built it all myself. It's a ground mount system, which makes it relatively easy to maintain. I am an engineer with experience in aerospace, robotics and other domains. The point being, I am well qualified and have decades of experience in electronics as well as high voltage (over 20,000 VDC) electronics.
I have never in my life experienced something as frustrating as SMA support. I don't know if they are badly trained, but their system is horrifically bad. It seem designed to impede support, frustrate people and have them leave or go spend thousands of dollars unnecessarily.
I have done all of the troubleshooting many times over and documented it all. I also brought in and paid a service tech (probably not SMA certified) to confirm my findings: One of the inverters has a problem and has to be replaced. Nothing else can be the problem, not the panels, not the wiring to the array. It's the inverter.
They put me through the wringer. They asked for logs. I sent logs. They asked for resets and then logs. I reset and sent logs. They asked for thermal images (they probably thought they had me there) and I grabbed my FLIR camera and sent them thermal images. I delivered everything they asked for and then some. Data. Pictures. Tests. Logs. And a report from the technician.
And then they say (paraphrasing): If this is going to RMA you need to have a corporate account to ensure you are certified or we cannot RMA the inverter. This, after days of frustrating back-and-forth, impossible phone calls, techs cutting leaving the chat while I was waiting for the inverter to reset and boot, etc.
While I was a happy customer. Sometimes the most important thing is what happens and how they a company treats you when you need help. This is absolutely not how you treat customers. I am not sure if this is a cultural thing (it's a German company) or what. There is simply no way I can ever recommend anyone use any SunnyBoy product. I you do, just be aware that, when you have a problem, and you will eventually, they don't have your back and they will make it as difficult and frustrating as possible, to the point that I told my wife the other day that I wanted to go to the DMV to experience good customer service (imagine that sentiment).
The only way they will learn is if they lose business. Don't buy their products. Period.