So, after realizing that walking over 2km from static boots generated just 400 EU, i noticed that static boots is utterly useless, really useless.
Thus, my suggestion is to increase the EU generated by the boots to 20 EU per meter (block) walked.
Another suggestion is to add a magic-tech enchant, called "Electrostaticity". It can only be applied to armors and swords (you could anvil it into a tool though).
If on an armor, the enchant will add 2^enchantlevel EU to ANY EU accepting item in the inventory (including electric armors themselves, which could be enchanted with it) for every block traveled.
If on a sword, the enchant will make the sword do electric damage alongside the usual damage of the weapon. Electric damage is equal to the level of the enchant. (half a heart to 2.5 hearts)
Electric damage will bypass any armor but electric armors, which will instead lose 1% of its max storage for every half heart of electric damage blocked.