The Multi Functional Electric Storage unit or MFE is the second tier of energy storage devices.
INPUT: Accepts up to 128 EU (MV) packet power into any of its 5 input faces, with unlimited EU/t
OUTPUT: Emits 128 EU (MV) packets from its output face (the face with the dot), with a max of 128 EU/t (MV). This current will destroy all first tier machines if it is not first transformed with an LV Transformer.
The MFE will not explode if it reaches full capacity.
The MFE can also accept a redstone input. This will change the action of the MFE depending on which setting is selected. This setting can be changed by clicking the button with an image of redstone on the top right.
If you place redstone in the bottom slot of the MFE, it will be burned and added to its internal energy storage.
Here is a great video explaining everything you need to know about the MFE:
Here is a video geared towards intermediate and advanced players that will explain some of the more advanced concepts of IndustrialCraft EU power.