My first created mod.

Solar Panel Mk1:
10x better than normal
Crafting:
(11x Solar Panel)

Solar Panel Mk2:
100x better than normal
Crafting:
(11x Solar Panel Mk1 -> 121x Solar Panel)

Solar Panel Mk3:
1000x better than normal
Crafting:
(11x Solar Panel Mk2 -> 1331x Solar Panel)

Accumulator Mk1:
10x better than normal
Crafting:
(11x Accumulator)

Accumulator Mk2:
100x better than normal
Crafting:
(11x Accumulator Mk1 -> 121x Accumulator)

Accumulator Mk3:
1000x better than normal
Crafting:
(11x Accumulator Mk2 -> 1331x Accumulator)

No research needed, costs are expensive enough for the space saving items.