Hello, got the underground world you can only have the one accumulator that you start with, if that has low capacity for you then you could edit the save game file to raise the limit. You can't use accumulators overground to send power underground.
Did that fix your issue? Sorry but I've not looked into this mod for a few months now. I thought it stopped being compatible.
Thanks for answer. I just change version number in mod file, it works with 0.18. I think because interface itself is accumulator and cave has always nighttime normal accumulators won`t discharge. If change interface for something like Factorissimo does it should work