Hi Sentinmel!
I'm here to suggest something.
At first, here are the reasons why I will suggest somethings:
1- I think the Advanced Solar Pannel is too easy to get. 1 Advanced machine, 1 Advanced alloy (for the reinforced glass), some circuits and 1 Ura ... that's not a lot of ressources for something that can store energy, produce 8EU/t and 1 during the night.
2- Even if I like the fact you implemented some rare ressources for its creation (eg. Uranium), I dislike the fact it makes it obsolete as a Fuel for Nuclear Reactor. I guess servers using your addon don't have a lot of Nuclear Reactor ... even no one would I say. What about making it based on diamonds ? (because, diamonds could be useful as a transparent material).
3- I'm not playing FTB because of few things: Ability to "teleport" Lava from the Nether to real world, i.e easy infinite source of EU, mystcraft dense ores ages, the fact that Forestry can replace IC² Greengen with Logger + Generator at a cheaper cost but ESPECIALLY because Gregtech (Iridium generation) + Mystcraft Dense ore + Advanced Solar Pannels. I think it's too easy to get a bunch of Iridium with quarrying mystcraft dense ore ages. You would be right saying to me I should complain about Mystcraft more than about your addon. But I think it would be easy to you to reduce the amount of Iridium needed while increasing the amount of UUM for the crafts, aren't you ?
4- I'm not against the fact you can produce 512 EU/t with a single block, but I think (even more, as it's infinite) it should be way more expensive than using Nuclear Reactor. Actually, it is, but not as I think it should be.
5- To me, your addon definitely makes windmill useless (ASP can be used as Night energy generation, are easier to use than Windmills and with about the same prices, without counting cables).
Basically, I'm suggesting a few things:
Make an even harder mode, the "balanced mode", where the Advanced Solar Pannel needs 3 "Advanced Glass Blocks", wich could be crafted out of 6 Reinforced Glass and 3 diamonds (for 3 Advanced Glass Block). Also makes it use 2 Adanced Machine Block and 1 Advanced Circuit.
Then makes the more advanced than the first one unable to produce more than 8EU/t, but able to refuel Depleted Uranium cells (Light is a radiation, and sun is continuously sending us Alpha particles so ... ^^).
It could also be good for the Hybrid Solar Pannel and Ultimate one being Ura Cells very slowly at first but being able to be "upgraded" by "Lens Blocks" (diamonds and Glass/Reinforced glass) that wouldn't that much increase its price but makes it take more space (because it wouldn't works with obstruction between it and the sun).
Thanks for reading 