I really do not like the fact that the basic advanced solar panel now requires "matter". It is hard enough to get decent power from arrays of hybrids (that is a lot of materials) to get decent matter generation. Now even the 1 step up from the very basic solars requires one of the most advanced machines in IC2. I would ask that you change the recipe to not require matter. Just require a diamond or so per panel. That alone would still be a huge cost to get a large amount of EU from arrays of advanced solars.
Fortunately I am still playing the 1.4.7 version which doesn't require matter. No reason to upgrade now.