I haven't had trouble with that, but have had a problem where I ran insulated copper cable less than 15 metres from a generator to some recyclers and they refused to accept any energy at all (the generator stayed charged and refused to emit any energy). Sometimes destroying a cable and replacing it would make that recycler, or maybe a couple nearby, accept some energy for a while, but never reliably and never all of them. Randomly adding a batbox to the system for no good reason fixed it.
not suprising there given the losses involved in long copper cables like that. A Bat-Box steps it up from 10 EU packets to 32 EU packets.