Hello, I did some light testing with the generator and I can say that the cell issue is still an issue.
I tested by hosting a server with only hydrocraft on it. I also made sure I was on the latest version. I was also the only player.
I enabled admin mode, then ran out into the middle of the forest. I then used console commands to create and plug in the solar generator and place a hydrocraft lamp.
I then turned the lamp on and ran out of the cell, then ran back, and the generator was off and I had to replug.
I then went into town and placed the generator outside a building and turned on it's built in lights.
After running back out and in, the lights were no longer powered by the solar generator.
I then repeated the city test while using a regular generator, and the regular generator worked. I was able to leave the cell and come back with the lights on.
I hope this helps.