teal95
Solar Enthusiast
Have 20 kW of panels with 6 strings of 7 panels each, going into a SolArk 15k, so only 3 MPPT. I have shading issues and knew it would be a problem, hence the optimizers, especially since I already had to get RSD as panels are roof mounted.
I only got the system operational right after Christmas so only the last few days have I actually have sun. Peak of the building is N-S and only 4-12 pitch. MPPT 1 is 2 rows of panels on the east side of the roof. MPPT 2 is 2 strings on the west side of the roof. MPPT 3 is the bastard, the bottom row of panels on the west side is 1 string and the other string is the 2 panels at the end of each of the first 4 strings. So I know #3 is going to behave oddly. I have a plan to improve things, but I want to get what I have inspected first as it's what's on the drawing.
As I finally have some sun I can see how bad it's doing. At ~1:30 every day as the shadows start creeping up the bottom of the west side the power production drops off a cliff (from ~6 kW down to 2 kW), while the voltage spikes (from 250 to 350).
Does this make sense to anyone? I would expect the optimizers to drop the voltage, not increase it.
I only got the system operational right after Christmas so only the last few days have I actually have sun. Peak of the building is N-S and only 4-12 pitch. MPPT 1 is 2 rows of panels on the east side of the roof. MPPT 2 is 2 strings on the west side of the roof. MPPT 3 is the bastard, the bottom row of panels on the west side is 1 string and the other string is the 2 panels at the end of each of the first 4 strings. So I know #3 is going to behave oddly. I have a plan to improve things, but I want to get what I have inspected first as it's what's on the drawing.
As I finally have some sun I can see how bad it's doing. At ~1:30 every day as the shadows start creeping up the bottom of the west side the power production drops off a cliff (from ~6 kW down to 2 kW), while the voltage spikes (from 250 to 350).
Does this make sense to anyone? I would expect the optimizers to drop the voltage, not increase it.