Sun power production
I have a 5.5kw Sunsynck inverter coupled to six 445W Canadian solar sun panels three each in parallel. In the morning production of power goes up up to certain level of light intensity. Then production start to drop although intensity of light still goes up. The batteries are not fully charged at that stage. The production of power also jump up and down. Is there fault with inverter ?
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If you look at the data sheet for solar panels, you will see the Current -Voltage curves. This is also presented for different temperatures. You will notice from these curves that As the temperature increases, the current will start to drop at a lot lower voltage. So from the specs that you have provided, 3x40.9 ~ 123V. This is where the panel will provide the max power. You mentioned that the inverter is keeping the voltage at 135V so this is already more than the 123V that the panels should be at the the current is dropping. As the sun moves in the sky, the angle of incidence becomes more accurate and the panel should ideally move into its peak zone but because the voltages are not correct, the power is dropped. Added to this, as the temperature increases, the above becomes even more important. So I believe that this system was not designed optimally. I’m no expert in this field so you can also check with R&D. If all panels are facing the same direction, your installer can easily test this by combining the 2 strings into 1 at the inverter to quickly test.