[1.11.2] Dynamically changing energy storage

Hey guys, so im working on my Machine and i added a slot for an "Energy Upgrade" . Basically what i want this to do is when its in the correct slot it will double the amount of energy the block can store. The problem im having is i cant figure out how to dynamically change it. if tried setting it to energyStored * energyMultiplier  and set energyMultiplier to 2 if the upgrade is detected but i get nothing out of that.

public int storageMultiplier = 1;

	public TilePulverizer() {
		if(pulverizerInv.get(5).getItem() == ModItems.EnergyUpgrade)
			storageMultiplier = 2;
		if(pulverizerInv.get(5).isEmpty())
			storageMultiplier = 1;
	}

	public EnergyStorage storage = new EnergyStorage(50000 * storageMultiplier);