More MPPT Confusion and Question
Still trying to understand my MPPT set-up and what would be the effect of changing things a bit. My 230w (30.0 Vmp x 7.7 Imp) poly panel has a Vmp of 30.0v with a measurement tolerance of +/- 3% S...
Forum Discussion
BFL, look at the top power curve.
The current is constant to nearly 15 VDC and then starts to gradually taper until it hits about 27 VDC.
The current falls off quickly above 30 VDC, so the controller keeps adjusting its input impedance (voltage) while monitoring its input current for maximum power.
Increase the voltage too much and power falls off quickly due to its steep slope...
Lower the voltage and the slope is less steep and almost flat when optimized.
Since energy cannot be created or destroyed, just moved around, the power at the input terminals will "always" be equal to the panel power minus the power losses in the cabling.
The controller runs the zoo...
The current is constant to nearly 15 VDC and then starts to gradually taper until it hits about 27 VDC.
The current falls off quickly above 30 VDC, so the controller keeps adjusting its input impedance (voltage) while monitoring its input current for maximum power.
Increase the voltage too much and power falls off quickly due to its steep slope...
Lower the voltage and the slope is less steep and almost flat when optimized.
Since energy cannot be created or destroyed, just moved around, the power at the input terminals will "always" be equal to the panel power minus the power losses in the cabling.
The controller runs the zoo...
