efficientPV
Solar Addict
- Joined
- Sep 24, 2019
- Messages
- 1,367
I did a little test as a proof of concept. I plotted the volts and amps of a panel in a sweep of the load. The blue is the current. Notice the flat top portion which is Isc. Then current starts dropping. The yellow is the voltage of the panel which is rising till Voc is reached. Red is the multiplication of I and V. Where it peaks the Vmp can be found. This is an old 12v panel and it has a long extension cord connecting it to the tester. That added resistance is why 12.6V is lower than expected. It is neat to see and know those published curves come from somewhere. Tester is small enough that it can be placed into a small hand held device like you have seen for $50. This is what they are doing except a micro reads and calculates the data. and it can be done in microseconds. I hope to later show multiple regional peaks for arrays in shade.