Solar Panel Voc-MPPT?
Wondering if there is any relationship between measured Voc and MPPT performance with a 24v panel. My 12v panel has a Voc rating of 21.9 and Isc of 8.2, but I often see 8.2ish when Voc is only 20....
Forum Discussion
Salvo wrote:
Afain, you're wrong. I now realize you know very little on the workings of controllers & PV cells; just enough to be dangerous.
In my previous post, I didn't say the power is fixed! It can vary all over the place. I just picked one operating point; when the mppt controller outputs 100W. Guaranteed, mppt performance will degrade 14.3% when battery voltage increases from 12.0V to 14.0V.
Also, you don't have a clue how pwm works. This system outputs a current that's a few percent less than than the short circuit current of the panel. Isc is NOT affected by temperature! If anything, current increases a little with temperature.
Sal
LOL, I am not wrong...
The solar panel converts solar energy into electrical energy, the controller delivers this electrical energy to the battery, and the battery converts the electrical energy into chemical energy.
Energy is what what we are concerned with...
Power is the rate of energy consumption/delivery, so if power is multiplied be seconds you get joules.
Using your own example, the power stayed the same, so the same energy was delivered and hence no degradation in the system.
If you would open your mind, you could learn something...
