Minor Solars can become grumpy about charging if you set them too high

[Forthwrong]

I'm pretty sure that as of a few weeks ago, setting up the solar SMESs to 85k/40k (north) and 95k/50k (south) maintained power indefinitely in cog2; I've definitely seen 100% station areas powered at the end of reasonably long rounds with those settings without a running engine. Even though the wiki says that setting the south one higher than the north one would drain the grid of energy.

I'd love to know how the power grid actually works.