tin cells are great,but when you're trying to make an automated fuel factory,it eats up tin and prevents automation.
This is why i'm suggesting:
Glass cells
glass cells can be made like this:
G () G
G G G
G G G
G= glass
This makes 16 glass cells.
unlike tin,glass cells aren't resistant to radiation,
and thus cannot be used for cooling cells,uranium cells,and depleted uranium cells.
using this,making automated biofuel factories would be possible,whithout sacrificing too much
game balance.