Have you noticed that when you are in the right position for a solar eclipse by the mun that the solar panels pick up zero energy until the eclipse is over. There is no percent gradient it is simply all or nothing. I am currently struggling with getting my probes to stay in a position that optimizes solar energy gain. I'm in career mode and I am stuck using the basic panels. I like using fusebox to optimize the angle.
I'm not too far into career mode and I've only got a couple of sats up, so good timing finding your mod tonight!