Solar and A Brief Encounter with Leafy Shade
Morning solar with a tree 40’ away. 3x250W series poly panels and 3 bypass diodes per panel. Past 7:50 AM the MPPT controller is decreasing the array voltage as it seeks the maximum power from the arr...
Forum Discussion
Always good to clarify posts. I agree that the controller is adjusting the panel load to achieve the maximum output. This information that I found by searching should help.
A Maximum Power Point Tracking solar regulator will simulate the load required by the solar panel to achieve the maximum power from the cell. The regulator will work out at which point the cell will output the maximum power and derive from this the voltage and current outputs required for maximum power to be achieved. It will then calculate the load that it must simulate based on these voltage and current levels R=V/I. The regulator, now receiving the maximum amount of power in, will then regulate the output according to what it is designed for.
From Wikipedia
Solar cells have a complex relationship between temperature and total resistance that produces a non-linear output efficiency which can be analyzed based on the I-V curve. It is the purpose of the MPPT system to sample the output of the PV cells and apply the proper resistance (load) to obtain maximum power for any given environmental conditions.
