My mom recently purchased a home that already had a solar installation installed in it -
The system is doing something very strange. Example - On June 16th, there was power produced consistently throughout the day mostly about 1 kwatt, but it was a very low rate. The peak power was at 11:15am, at which point it produced 1.83 kwatts. The weather history for this day was cloudy all day. On June 13th, power was only produced in the morning, and peaked at 1.46 kwatts, but power stopped being produced for the day by 10am. The weather history for this day reports a sunny and hot day, with temperatures reaching the 90s. Daily generation is about 2 to 3.5kwh. This is WAY below what the array should be generating. (see attached)
There is minimal shading in the morning, but by noon there is no shading. During full sun and no shading, the inverter has a green flashing light (about 1hz), the manual is ambiguous in it's description of this indicator. It either means waiting for grid or waiting for panels. It does very clearly state that no power is being generated (Pac=0). I have measured the AC and DC voltage during both times when it is operational and non-operational. The two legs of AC are at 123volts each (246 total), and the DC array voltage is 365 in both scenarios. The inverter reported values are the same or really close to the values I measured with a multimeter.
The installer (selected by the previous owner) appears to be a crook. The owner says this was a new installation (indeed the array is not in google maps yet). It is not known if the array was fully operational before my mom bought it. The installer mentioned that the previous owner "took" the internet interface of the box, and she had to purchase a new one to figure out what was going on with the array. Now that the stats are being monitored, he recognized the power output stops early morning, and said it was due to shading issues. He said a new inverter should be purchased. Never mind the fact that this new installation has an inverter that was discontinued a long time ago. The previous owner of the home is not being very cooperative.
Anyways, I am not really looking for advise on how to deal with the installer or previous owner. I'm curious if any of you guys have seen something like this before, and have any insight as to what might be technically wrong with the installation, or have any direction on what additional investigation or tests I can perform.
Thanks in advance!!
Inverter: SMA Sunny Boy 10000TLUS-12
Panels: MAXPOWER2 CS6U-340M (30 panels arranged in 3 strings)
Array: Azimuth 180 degrees, Elevation 18 degrees, portrait orientation, 2 rows of 15
Location: Terrestrial mount in San Diego, CA
Panels: MAXPOWER2 CS6U-340M (30 panels arranged in 3 strings)
Array: Azimuth 180 degrees, Elevation 18 degrees, portrait orientation, 2 rows of 15
Location: Terrestrial mount in San Diego, CA
The system is doing something very strange. Example - On June 16th, there was power produced consistently throughout the day mostly about 1 kwatt, but it was a very low rate. The peak power was at 11:15am, at which point it produced 1.83 kwatts. The weather history for this day was cloudy all day. On June 13th, power was only produced in the morning, and peaked at 1.46 kwatts, but power stopped being produced for the day by 10am. The weather history for this day reports a sunny and hot day, with temperatures reaching the 90s. Daily generation is about 2 to 3.5kwh. This is WAY below what the array should be generating. (see attached)
There is minimal shading in the morning, but by noon there is no shading. During full sun and no shading, the inverter has a green flashing light (about 1hz), the manual is ambiguous in it's description of this indicator. It either means waiting for grid or waiting for panels. It does very clearly state that no power is being generated (Pac=0). I have measured the AC and DC voltage during both times when it is operational and non-operational. The two legs of AC are at 123volts each (246 total), and the DC array voltage is 365 in both scenarios. The inverter reported values are the same or really close to the values I measured with a multimeter.
The installer (selected by the previous owner) appears to be a crook. The owner says this was a new installation (indeed the array is not in google maps yet). It is not known if the array was fully operational before my mom bought it. The installer mentioned that the previous owner "took" the internet interface of the box, and she had to purchase a new one to figure out what was going on with the array. Now that the stats are being monitored, he recognized the power output stops early morning, and said it was due to shading issues. He said a new inverter should be purchased. Never mind the fact that this new installation has an inverter that was discontinued a long time ago. The previous owner of the home is not being very cooperative.
Anyways, I am not really looking for advise on how to deal with the installer or previous owner. I'm curious if any of you guys have seen something like this before, and have any insight as to what might be technically wrong with the installation, or have any direction on what additional investigation or tests I can perform.
Thanks in advance!!
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