P&O Algorithm

[Shaopus]

Hi
I have a problem with mppt algorithm about your code, as follow：

if(powerInput>powerInputPrev && voltageInput>voltageInputPrev)     {PWM--;}  //  ↑P ↑V ; →MPP  //D--
else if(powerInput>powerInputPrev && voltageInput<voltageInputPrev){PWM++;}  //  ↑P ↓V ; MPP←  //D++
else if(powerInput<powerInputPrev && voltageInput>voltageInputPrev){PWM++;}  //  ↓P ↑V ; MPP→  //D++
else if(powerInput<powerInputPrev && voltageInput<voltageInputPrev){PWM--;}  //  ↓P ↓V ; ←MPP  //D--
else if(voltageOutput<voltageBatteryMax)                           {PWM++;}  //  MP MV ; MPP Reached - 

About P&O Algorithm, if(powerInput>powerInputPrev && voltageInput>voltageInputPrev) , should increase PWM.
However，your code is the opposite of it, Can you explain?
Thank you！

[Tomsan83]

i think it is ok, when power goes up and voltage as well, you are climbing on the curve of power on the right drection so you need to decrease PWM. You increase PWM when moving left and decrease when moving right. It is because the fact when voltage is MAX, the current is MIN and opposite. For detail go to Angelo project page:
https://www.instructables.com/DIY-1kW-MPPT-Solar-Charge-Controller/
chart called PV iV graph op.regions.