Basically, No recipe works. It does give me recipes for tier 5 and up, but none for cables, none for tier 1-4, none for mirrors, photovoltaic cells or upgrades. So it's not usable in survival.

It may well be that something else is missing, as a lot of mods are still not available for 1.12, but I think the default recipes should work.

To recreate, use https://minecraft.curseforge.com/projects/all-the-mods-3 for 1.12 and use SolarFlux with it.