NinerBikes wrote:
ktmrfs wrote:
Post #10
10)
This is for the case of resistance between the panel and controller. The effects of a long run with PWM controller between the controller and battery bank is not part of this investigation. That experiment is “left as an exercise to the reader”. Any volunteers???
How would this vary between MPPT and PWM, assuming same input voltage and same input amperage coming out of the devices to the battery? Obviously, the thicker the wire and shorter the run, being DC current, the lower the losses of watts/voltage and amperage. This is of concern if you use long runs of wire between portable solar cells and your batteries, I would assume?
As you noted, "short and fat wins over long and skinny every time."
However there are several things that come into play that could have different consequences on MPPT vs. PWM with a higher resistance between the controller and battery.
I gave it signficant thought, and really couldn't remotely convince myself what the effects would be on each system, so rather than speculate, I left it as "an exercise to the reader".
similar to some of the textbooks I had in college where MOST answers were in the back. the ones without an answer often said. "left as an excercise to the student" I quickly figured out that the prof that wrote the book didn't give the grad student solving the problems the solution, and the grad student finally gave up trying to solve the problem and "left it as an excercise to the student".
If anyone has some actual comparison data, or even data for increased resistance effects between the controller and battery for EITHER controller type, please post.
