Advanced tiers of solar panels and accumulators.
inspired by Skandragon's Solar panel mod : https://mods.factorio.com/mod/skan-advanced-solar
most of the things are same but code behind is written from scratch. images are altered images of vanilla game.

changes vs Skandragon's mod:
- supports fast replace, Upgrade planner recognizes it (might conflict with other mods)
- newer graphics, icons, based on Factorio 1.1 images
- minor changes in tech tree. I tried to balance compared to vanilla techs
- easy addition for new tiers, within a single file

Details:
- each tier is x3 powerful compared to previous tier.
- entity sizes are same, so existing blueprints will work when entities are 1-1 replaced (and power output shall be x3, x9 or x27 depending on the tier).
- each entity (3 new accumulators and 3 new solar panels) are unlocked by separate technology research
- Tiers: base (vanilla), Advanced (x3 of vanilla), Elite (x9 of vanilla), Ultimate (x27 of vanilla)