# Help on MPPT for solar panels

I am studying maximum power point tracking (MPPT), and I have found many setups using buck converter. Since buck converters step down the voltage, how can you have the maximum power at load if you step down the voltage? Do you increase the current so you get maximum power?

I am also confused about what load to use in the output of the buck converter. For example if you step down from a 17V solar panel input to a 5V output, and the maximum power from the solar panel is 10W, you need 2A current at the output (5V*2A = 10W), so your load should always be 2.5 $\Omega$? So if one changes the load, then the maximum power cannot be reached?

I hope someone can point me in the right direction, and correct me if my understanding is wrong.