In the context of the particular logo that you've developed, we do agree with what you are saying--less is more for your chosen graphic. We think the addition of the lightning bolt and battery made the logo a little too cartoonish, and overloaded.
#23 continues to be one of our top choices. The only thing holding us back is that for some of our voting committee, the appearance of this starburst reminds them of a laser rather than solar energy. You can use that thought as insipiration for additional tweaks if you'd like.