the chemical fuel cell recipe seems pretty cheap compared to the other 2, i think around 2x the cost would be adequate
maybe 4 accumulators, 20 advanced circuits and 80 batteries
also i don't really see the point in the other devices when you have the water generator
i thought this mod added new options to generate power without water, like a different water-less production chain for iron, copper, coal.. yeah dunno what i was thinking.

Did you play the mods with a normal map or with ressources spread out ?

normal map, maybe a little bit spread out but rich resources

That would really make the mod irrelevant. It's made to solve problems on hard maps.