[HV solar panel factory]

The problem I ran into was rate-limiting steps where you're chaining one ACT to another, like the production of RE-batteries and machine blocks as part of creating generators. Since you can't stop the ACT from creating its outputs if the destination is full, it doesn't matter if you have chests or buffers or whatever between them and the generator assembler as they'll eventually fill up and start spilling on the ground. About all I could figure out was to mess with the timers to try and deliver the parts at as close to the same rate as possible, but it's a very fine balancing act, and even a slight difference in timing will cause one route to start backing up.

I used Advanced Insertion Pipes with a loop-back to a chest... This way it kept looping the stuff around until it was needed.

[HV solar panel factory]

For non-stacking items I thought you just pumped the items into a chest next to the auto-crafting table, then when you pull the target out of the table it replenishes the items from the chest.

This was something I did not know. Ok, the OP needs to do this instead of manually doing it like I did, they can do what I have quoted here and it will become automatic. We all learn something new everyday.

[HV solar panel factory]

As for regular Solar Panels, LV Array, MV Array... a machine is not a problem it can be fully automated. The HV Array is a problem. I have already tried to do this, I even posted my machines on Youtube. My machine uses Buildcraft/BC Add pipes and auto crafting tables. The reason you can not make a HV Array in a auto crafting table is because Energy Crystals will not stack. Everything to make the HV Array can be auto crafted and sent back to an auto crafting table (except for the crystal) and the crystal sent to a chest. Manually place the crystal into the table and pull out the HV Array. I did use elec engines for ease of use, but it can be done with Buildcraft engines just as well with a bit more piping.

Otherwise have fun figuring out different ways of handling this process. I did it on SMP. I will say I used creative to build it and it was to show/prove it could be done. If you find/look at my video, that is fine. I suggest you try to build it yourself first. I had fun trying to build it and figure out the best setup for it.