There have been a few threads about things similar to this. But I wanted to kind of make this more specific. Me and my friend had an idea for shielding tech. It would either feed off your energy bar, which would cause a recharge delay on your energy, where the shield would have to go, say, five seconds without taking damage for your energy to start to recharge, and shield capacity and recharge delay would be upgradeable according to the rules of my upgrading tech thread. Or, alternatively, have a similar mechanic, but have the shield as its own separate bar, which takes energy to recharge. Upgrading Tech thread: http://community.playstarbound.com/index.php?threads/upgrading-tech.60313/