So I know there are several ways to step voltage down to be readable by the AVR, but I am not familiar with them all. In my example the max voltage is 24 volts coming from the solar panels. The max current is 0.55Amps. When I get less sunlight the volts can dip to ~16 with ~ 0.33Amps.
I could use some high wattage resistors to measure the voltage, but doesn't my resistance change when the current changes? What is a better way to step down the 24 volts to be read by the ADC on my AVR?