I recently got my system installed: 12.8kW solar with 2 PWs (1x PW+, 1x PW). Waiting for PTO now, but the system is operational in self-consumption mode.
My solar output is much lower than expected. Based on PVWatts and Tesla's estimates, I should be getting ~16,000kWh per year. The orientation is not ideal (north-facing roof) but the pitch is low at 2/12, and it's a single contiguous array of 32 panels without much shade. In March, PVWatts expect ~1285kWh or ~40kWh per day. However, what's I'm seeing in the last week is less than 20kWh per day when it's sunny. Peak output is at 3.3kW, at around 1pm. Batteries are at 50% so I don't think solar production is getting capped. A single inverter may be an issue for my setup, but I'm not even close to the 7.6kW max.
I'm going to contact Tesla for help, but based on forums this will be a struggle, especially before PTO. I'd like to diagnose the issue as much as I can before that.
From what I can gather from this forum, this looks like an issue with the strings and/or the Tesla inverter. I have two sets of red/black wires going into the inverter so I think two strings for 32 panels? I attached some photos of the inverter. I also gathered diagnostics from pypowerwall at noon today:
Does this look like only one string is producing and I'm only seeing half the expected output? Any other things I should try before contacting Tesla? It's not clear to me what the proper procedure is for restarting the Tesla inverter.
Thanks for your help!
My solar output is much lower than expected. Based on PVWatts and Tesla's estimates, I should be getting ~16,000kWh per year. The orientation is not ideal (north-facing roof) but the pitch is low at 2/12, and it's a single contiguous array of 32 panels without much shade. In March, PVWatts expect ~1285kWh or ~40kWh per day. However, what's I'm seeing in the last week is less than 20kWh per day when it's sunny. Peak output is at 3.3kW, at around 1pm. Batteries are at 50% so I don't think solar production is getting capped. A single inverter may be an issue for my setup, but I'm not even close to the 7.6kW max.
I'm going to contact Tesla for help, but based on forums this will be a struggle, especially before PTO. I'd like to diagnose the issue as much as I can before that.
From what I can gather from this forum, this looks like an issue with the strings and/or the Tesla inverter. I have two sets of red/black wires going into the inverter so I think two strings for 32 panels? I attached some photos of the inverter. I also gathered diagnostics from pypowerwall at noon today:
Code:
{
"A": {
"Connected": true,
"Current": 7.5600000000000005,
"Power": 2618.0,
"State": "PV_Active",
"Voltage": 347.3
},
"B": {
"Connected": true,
"Current": 6.08,
"Power": 122.0,
"State": "PV_Active",
"Voltage": 20.1
},
"C": {
"Connected": true,
"Current": 10.38,
"Power": 202.0,
"State": "PV_Active",
"Voltage": 19.400000000000002
},
"D": {
"Connected": false,
"Current": 0.0,
"Power": 0.0,
"State": "PV_Active",
"Voltage": 1.5
}
}
Does this look like only one string is producing and I'm only seeing half the expected output? Any other things I should try before contacting Tesla? It's not clear to me what the proper procedure is for restarting the Tesla inverter.
Thanks for your help!