Greetings!
I was stupid and didn't setup a pi with pypowerwall (and the dashboard) until recently, so I'm in the hole already for trying to determine if the array I have is working correctly. The whole setup has been live for a couple of days past one year.
Three strings total, with a small string on the front of the house of 9 panels. This string is feeding into the same inverter as the smaller of the two strings below.
The other two strings, both installed in one array (14 panels on one according to the permits, 20 on the other). 34 panels in total. MPPT brings the string voltage up to optimal. Both strings are feeding into their own Tesla inverters, both are jumpered in the inverter (I'm betting that two MPPT's share the load?). All Tesla panels. The facing isn't super ideal at 254 degrees. But there is *zero* shade on the array (top of a hill that falls away, no trees to cast shade, just clouds)
Here's the part that has me suspicious. One string has its MPPT brought up to 365 ish volts (real volts on the wire doubled I'm guessing because two MPPT's?). The other is brought up to around 215 volts. This makes some amount of sense for two strings of different numbers of panels. But both strings produce the same amount of energy, roughly 4kw each (8kw total). That doesn't make a ton of sense if one string has significantly more panels.
But, if you dive into it a bit deeper, the smaller string, with the smaller voltage, is actually producing a bit more than the larger string.
I guess before I go try and convince Tesla there might be an issue (beyond that one of the inverters died like 4 days ago), does the logic above make any sense and are the conclusions somewhat correct?
In a lab, assuming each panel is 400w, that array could, in theory, put out 13.6kw. On a sunny day, it's barely hitting 8. The panels appear clean (I took up a drone to look). Again, the facing isn't super ideal at 254 degrees, so I'm not expecting lab results, but two different sized panels, with the MPPT's producing different voltages to suggest they are indeed different, producing roughly the same amount of power seems off.
I was stupid and didn't setup a pi with pypowerwall (and the dashboard) until recently, so I'm in the hole already for trying to determine if the array I have is working correctly. The whole setup has been live for a couple of days past one year.
Three strings total, with a small string on the front of the house of 9 panels. This string is feeding into the same inverter as the smaller of the two strings below.
The other two strings, both installed in one array (14 panels on one according to the permits, 20 on the other). 34 panels in total. MPPT brings the string voltage up to optimal. Both strings are feeding into their own Tesla inverters, both are jumpered in the inverter (I'm betting that two MPPT's share the load?). All Tesla panels. The facing isn't super ideal at 254 degrees. But there is *zero* shade on the array (top of a hill that falls away, no trees to cast shade, just clouds)
Here's the part that has me suspicious. One string has its MPPT brought up to 365 ish volts (real volts on the wire doubled I'm guessing because two MPPT's?). The other is brought up to around 215 volts. This makes some amount of sense for two strings of different numbers of panels. But both strings produce the same amount of energy, roughly 4kw each (8kw total). That doesn't make a ton of sense if one string has significantly more panels.
But, if you dive into it a bit deeper, the smaller string, with the smaller voltage, is actually producing a bit more than the larger string.
I guess before I go try and convince Tesla there might be an issue (beyond that one of the inverters died like 4 days ago), does the logic above make any sense and are the conclusions somewhat correct?
In a lab, assuming each panel is 400w, that array could, in theory, put out 13.6kw. On a sunny day, it's barely hitting 8. The panels appear clean (I took up a drone to look). Again, the facing isn't super ideal at 254 degrees, so I'm not expecting lab results, but two different sized panels, with the MPPT's producing different voltages to suggest they are indeed different, producing roughly the same amount of power seems off.
