Preface: I'm trying to make the solar panels from this mod realistic, solar panels irl don't store energy, nor do any from other mods (that I'm aware of).

I believe I've unearthed a bug. If the storage of a panel is set to 0, it will not transfer any power, despite the transfer rate being non-zero and the panel generating power (as shown in its interface). I will admit it's an edge case, but it's still an issue.

Sorry to say this, but this mod is abandonware.
The creator hasn't been online since 2016, thus, if you want this fixed...you'll have to fork it yourself.

...
github, wtf exactly did you do. I reported this on the solar flux reborn github, somehow it got back here -.-