2oldman wrote:
westend wrote:
Paralleling different panels with different electrical characteristics to one MPPT controller is not a good idea.
Not sure why that would be always true. It's pretty simple to try it and see the amperage reading at the controller.
It is because the "knee" of the IV curve is different in the two different panels. That "knee" is where the MPPT controller observes the characteristics of the panel's output and determines how to sort voltage, amperage and resistance.
Think of it this way: The MPPT controller is lecherous. It likes to rub knees. If it has Charlise Theron in on one chair and Rosie O'donnell in another chair, it will get confused and start examining just Rosie's leg rather than Charlise's appendages. The result will not be pretty.
