What is voltage change based on temperature?

It refers to the difference in voltage based on temperature. The voltage of a solar panel will be slightly higher in cooler climates. The value can be presented as a percentage change or a value change. It’s sometimes also presented as a voltage value change per degree value change. In the past, it was quite difficult to find this information.

What is voltage at maximum power?

The current passing through your circuit will be zero at this time, so no power is dissipated. The voltage at maximum power, commonly referred to as VPM, is the voltage reading you’ll get when your panel is connected to the maximum load and is performing at its peak. This amount will be determined under standard test conditions (STC).

What is a nominal voltage?

The nominal voltage is a classification system that originated when batteries were one of the sole providers of power. That means this number isn’t listed on a sticker or the informational sheet as you would expect the VPM or open circuit voltage to be. It’s still useful to understand what it is, though.