Heres the sheet for the shield

Shield, Blocks up to 500 points of attacks 10 Energy

Med. Shield , Blocks up to 1000 points of attacks 50 Energy

Adv. Shield, Blocks up to 5000 points of attacks 70 energy

Master Shield, Blocks up to 10000 points of attacks Cost 100 Energy

Beam Sphere Shield, No Limits blocks everything at the cost of more energy 150

The energy cost does not matter if you have a Gundam or Suit with a NJC.